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[nazev] => Additive design of heat switch technology: Lessons learned
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[duvernost_udaju_id] => S
[popis] => An overview of “lessons learned” on capabilities of additive design is presented applied to two parts of the novel heat switch technology. Additive production of two technology demonstrators was performed on a SLM 280HL machine with AlSi10Mg powder material. Elements of concurrent design & manufacturing engineering were implemented to save time over the development cycle. At the conclusion, the knowledge gaps as software challenges with additive constraints, multi-material or multi-disciplinary optimization are discussed. The presented outputs represent a successful demonstration of the capabilities, maturity and applicability of additive design & manufacturing.
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[klicova_slova] => Additive manufacturing of metals, thermal management, spacecraft, heat switch, capabilities
[klicova_slova_orig] => Additive manufacturing of metals, thermal management, spacecraft, heat switch, capabilities
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[citace_text] => MAŠEK, J.; LÖFFELMANN, F.; KUBÍK, P.; MALÝ, M.; KOUTNÝ, D. Additive design of heat switch technology: Lessons learned. In Proceedings of the International Astronautical Congress, IAC. Proceedings of the International Astronautical Congress. Baku, Azerbaijan: International Astronautical Federation, IAF, 2023. 9 p. ISSN: 0074-1795.
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title="Additive design of heat switch technology: Lessons learned",
booktitle="Proceedings of the International Astronautical Congress, IAC",
year="2023",
journal="Proceedings of the International Astronautical Congress",
volume="2023",
pages="9",
publisher="International Astronautical Federation, IAF",
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[nazev_en] => Additive design of heat switch technology: Lessons learned
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[nazev] => A modification of Holzapfel-Ogden hyperelastic model of myocardium better describing its passive mechanical behavior
[nazev_orig] => A modification of Holzapfel-Ogden hyperelastic model of myocardium better describing its passive mechanical behavior
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[popis] => The passive mechanical behavior of the myocardium is usually mathematically described within the framework of hyperelasticity. One of the most popular models of this kind is that proposed by Holzapfel and Ogden in 2009. It is an orthotropic model formulated in terms of a reasonably selected set of scalar invariants representing different components of the myocardium. Several modifications of the model have emerged over the years. In this paper, we present another one which is characterized by an innovative approach to the modeling of myocardial "sheets", i.e. lamellar collagenous structures that endow the myocardium with orthotropic mechanical properties. We describe their contribution by means of a less common scalar invariant which expresses the change of area of an oriented planar element (representing the plane of a sheet). To compare our formulation with the original model, we matched both of them to the biaxial tension and simple shear experimental data from the literature using a nonlinear least-squares optimization algorithm. The objective function for each model included both biaxial and simple shear data in order to obtain a single set of parameters for both deformation modes. The results show that our modified model can accurately describe both types of tests. The total residual is lowered by approximately 80% by our modification and R2 increases from 0.877 to 0.978 which demonstrates the significance of our modification on the quality of the fit.
[popis_orig] => The passive mechanical behavior of the myocardium is usually mathematically described within the framework of hyperelasticity. One of the most popular models of this kind is that proposed by Holzapfel and Ogden in 2009. It is an orthotropic model formulated in terms of a reasonably selected set of scalar invariants representing different components of the myocardium. Several modifications of the model have emerged over the years. In this paper, we present another one which is characterized by an innovative approach to the modeling of myocardial "sheets", i.e. lamellar collagenous structures that endow the myocardium with orthotropic mechanical properties. We describe their contribution by means of a less common scalar invariant which expresses the change of area of an oriented planar element (representing the plane of a sheet). To compare our formulation with the original model, we matched both of them to the biaxial tension and simple shear experimental data from the literature using a nonlinear least-squares optimization algorithm. The objective function for each model included both biaxial and simple shear data in order to obtain a single set of parameters for both deformation modes. The results show that our modified model can accurately describe both types of tests. The total residual is lowered by approximately 80% by our modification and R2 increases from 0.877 to 0.978 which demonstrates the significance of our modification on the quality of the fit.
[klicova_slova] => Cardiac mechanics; Myocardium; Hyperelasticity; Constitutive model; Orthotropy
[klicova_slova_orig] => Cardiac mechanics; Myocardium; Hyperelasticity; Constitutive model; Orthotropy
[url] => https://www.sciencedirect.com/science/article/pii/S0997753825000208
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[citace_text] => VAVERKA, J.; BURŠA, J. A modification of Holzapfel-Ogden hyperelastic model of myocardium better describing its passive mechanical behavior. European journal of mechanics, A, Solids, 2025, vol. 111, no. MAY-JUN, 11 p. ISSN: 0997-7538.
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author="Jiří {Vaverka} and Jiří {Burša}",
title="A modification of Holzapfel-Ogden hyperelastic model of myocardium better describing its passive mechanical behavior",
journal="European journal of mechanics, A, Solids",
year="2025",
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number="MAY-JUN",
pages="11",
doi="10.1016/j.euromechsol.2025.105586",
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[nazev_en] => A modification of Holzapfel-Ogden hyperelastic model of myocardium better describing its passive mechanical behavior
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[nazev] => Dynamic performance and wear of ceramic aerodynamic tilting-pad journal bearings: Tested and simulated under excessive vibrations
[nazev_orig] => Dynamic performance and wear of ceramic aerodynamic tilting-pad journal bearings: Tested and simulated under excessive vibrations
[duvernost_udaju_id] => S
[popis] => Ceramic aerodynamic tilting-pad journal bearings are emerging as a crucial component in hydrogen-electric mobility, specifically within electric compressors that deliver compressed air to hydrogen fuel cells. These bearings provide an environmentally friendly solution by eliminating the need for oil lubrication, thus preventing contamination of the fuel cells. This study focuses on the wear performance of these bearings under extreme conditions, operated near critical bending speed with elevated vibrations surpassing assembly clearance levels. To assess performance, a custom high-speed test rig was developed, designed without coupling to ensure precise measurements and to prevent the transfer of vibrations from the electric drive to the bearing system. Detailed vibration measurements were conducted under extreme conditions across various rotational speeds, reaching up to 70000 rpm. Alongside this, a dynamic computational model of the aerodynamic bearing was created, incorporating an analysis of rotor vibrations. Experimental results were systematically compared with simulation data to validate the model’s accuracy. Key to this study is the wear assessment of the bearing pads under these demanding conditions. The findings reveal that the proposed bearings exhibit reliable performance even in highly demanding scenarios, demonstrating their robustness and potential applicability in other critical and high-stress environments.
[popis_orig] => Ceramic aerodynamic tilting-pad journal bearings are emerging as a crucial component in hydrogen-electric mobility, specifically within electric compressors that deliver compressed air to hydrogen fuel cells. These bearings provide an environmentally friendly solution by eliminating the need for oil lubrication, thus preventing contamination of the fuel cells. This study focuses on the wear performance of these bearings under extreme conditions, operated near critical bending speed with elevated vibrations surpassing assembly clearance levels. To assess performance, a custom high-speed test rig was developed, designed without coupling to ensure precise measurements and to prevent the transfer of vibrations from the electric drive to the bearing system. Detailed vibration measurements were conducted under extreme conditions across various rotational speeds, reaching up to 70000 rpm. Alongside this, a dynamic computational model of the aerodynamic bearing was created, incorporating an analysis of rotor vibrations. Experimental results were systematically compared with simulation data to validate the model’s accuracy. Key to this study is the wear assessment of the bearing pads under these demanding conditions. The findings reveal that the proposed bearings exhibit reliable performance even in highly demanding scenarios, demonstrating their robustness and potential applicability in other critical and high-stress environments.
[klicova_slova] => Aerodynamic journal bearing; Hydrogen electromobility; Measurement; Extreme conditions
[klicova_slova_orig] => Aerodynamic journal bearing; Hydrogen electromobility; Measurement; Extreme conditions
[url] => https://www.sciencedirect.com/science/article/pii/S0043164825001450
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[citace_text] => POKORNÝ, J.; NÁVRAT, T.; VAJDÁK, M.; CABAJ, G.; SLIWKOVÁ, P. Dynamic performance and wear of ceramic aerodynamic tilting-pad journal bearings: Tested and simulated under excessive vibrations. Wear, 2025, vol. 571, no. 6, p. 1-16. ISSN: 1873-2577.
[citace_html] => POKORNÝ, J.; NÁVRAT, T.; VAJDÁK, M.; CABAJ, G.; SLIWKOVÁ, P. Dynamic performance and wear of ceramic aerodynamic tilting-pad journal bearings: Tested and simulated under excessive vibrations. Wear, 2025, vol. 571, no. 6, p. 1-16. ISSN: 1873-2577.
[citace_rtf] =>
[citace_bibtex] => @article{BUT197187,
author="Jan {Pokorný} and Tomáš {Návrat} and Michal {Vajdák} and Gabriel {Cabaj} and Petra {Sliwková}",
title="Dynamic performance and wear of ceramic aerodynamic tilting-pad journal bearings: Tested and simulated under excessive vibrations",
journal="Wear",
year="2025",
volume="571",
number="6",
pages="1--16",
doi="10.1016/j.wear.2025.205876",
issn="0043-1648",
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[nazev_en] => Dynamic performance and wear of ceramic aerodynamic tilting-pad journal bearings: Tested and simulated under excessive vibrations
[popis_en] => Ceramic aerodynamic tilting-pad journal bearings are emerging as a crucial component in hydrogen-electric mobility, specifically within electric compressors that deliver compressed air to hydrogen fuel cells. These bearings provide an environmentally friendly solution by eliminating the need for oil lubrication, thus preventing contamination of the fuel cells. This study focuses on the wear performance of these bearings under extreme conditions, operated near critical bending speed with elevated vibrations surpassing assembly clearance levels. To assess performance, a custom high-speed test rig was developed, designed without coupling to ensure precise measurements and to prevent the transfer of vibrations from the electric drive to the bearing system. Detailed vibration measurements were conducted under extreme conditions across various rotational speeds, reaching up to 70000 rpm. Alongside this, a dynamic computational model of the aerodynamic bearing was created, incorporating an analysis of rotor vibrations. Experimental results were systematically compared with simulation data to validate the model’s accuracy. Key to this study is the wear assessment of the bearing pads under these demanding conditions. The findings reveal that the proposed bearings exhibit reliable performance even in highly demanding scenarios, demonstrating their robustness and potential applicability in other critical and high-stress environments.
[klicova_slova_en] => Aerodynamic journal bearing; Hydrogen electromobility; Measurement; Extreme conditions
[vysledek_datum] => 2025-02-06T00:00:00+01:00
)
[3] => Array
(
[vysledek_id] => 197215
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[nazev] => Synchronní dynamometr PMM450/5.3-25.
[nazev_orig] => Synchronní dynamometr PMM450/5.3-25.
[duvernost_udaju_id] => C
[popis] => Návrh a realizace synchronního dynamometru PMM450/5.3-25 se odvíjí od požadavků vyplývajících ze zamýšlené aplikace do testovacího pracoviště pohonů elektromobilů.
[popis_orig] => Návrh a realizace synchronního dynamometru PMM450/5.3-25 se odvíjí od požadavků vyplývajících ze zamýšlené aplikace do testovacího pracoviště pohonů elektromobilů.
[klicova_slova] => Synchronni dynamometr, Prototyp
[klicova_slova_orig] => Synchronni dynamometr, Prototyp
[url] =>
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[vycet_osob] => VLACH, R.; KRAML, A.; HUZLÍK, R.; BÁRTA, J.; MACH, M.; GREPL, R.; LOŠÁK, P.; ŘEDINA, J.; BERNARD, I.
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[citace_text] => VLACH, R.; KRAML, A.; HUZLÍK, R.; BÁRTA, J.; MACH, M.; GREPL, R.; LOŠÁK, P.; ŘEDINA, J.; BERNARD, I.: Synchronní dynamometr PMM450/5.3-25. (Prototyp)
[citace_html] => VLACH, R.; KRAML, A.; HUZLÍK, R.; BÁRTA, J.; MACH, M.; GREPL, R.; LOŠÁK, P.; ŘEDINA, J.; BERNARD, I.: Synchronní dynamometr PMM450/5.3-25. (Prototyp)
[citace_rtf] =>
[citace_bibtex] => @misc{BUT197215,
author="Radek {Vlach} and Aleš {Kraml} and Rostislav {Huzlík} and Jan {Bárta} and Martin {Mach} and Robert {Grepl} and Petr {Lošák} and Jiří {Ředina} and Ivo {Bernard}",
title="Synchronní dynamometr PMM450/5.3-25.",
year="2024",
note="Prototype"
}
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[nazev_en] => Prototype of Synchronous dynamometr PMM450/5.3-25
[popis_en] => The design and implementation of the PMM450/5.3-25 synchronous dynamometer is based on the requirements resulting from the intended application to a test site for electric vehicle drives.
[klicova_slova_en] => Synchronous dynamometer, Prototype
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[nazev] => Small-scale domain switching near sharp piezoelectric bi-material notches
[nazev_orig] => Small-scale domain switching near sharp piezoelectric bi-material notches
[duvernost_udaju_id] => S
[popis] => Assuming a scenario of small-scale domain switching, the dimensions and configuration of the domain switching region preceding a clearly defined primarily monoclinic piezoelectric bi-material notch are determined by embracing the energetic switching principle and micromechanical domain switching framework proposed by Hwang et al. (Acta Metall Mater 43(5):2073-2084, 1995. https://doi.org/10.1016/0956-7151(94)00379-V) for a given set of materials, structure, and polarization alignment. The piezoelectric bi-material under consideration comprises piezoelectric ceramics PZT-5H and BaTiO3. The analysis of the asymptotic in-plane field around a bi-material sharp notch is conducted utilizing the extended Lekhnitskii-Eshelby-Stroh formalism (Ting in Anisotropic elasticity, Oxford University Press. 1996. https://doi.org/10.1093/oso/9780195074475.001.0001). Subsequently, the boundary value problem with the prescribed spontaneous strain and polarization within the switching domain is solved and their influence on the in-plane intensity of singularity at the tip of interface crack is computed. The effects of the initial poling direction on the resulting variation of the energy release rates are discussed.
[popis_orig] => Assuming a scenario of small-scale domain switching, the dimensions and configuration of the domain switching region preceding a clearly defined primarily monoclinic piezoelectric bi-material notch are determined by embracing the energetic switching principle and micromechanical domain switching framework proposed by Hwang et al. (Acta Metall Mater 43(5):2073-2084, 1995. https://doi.org/10.1016/0956-7151(94)00379-V) for a given set of materials, structure, and polarization alignment. The piezoelectric bi-material under consideration comprises piezoelectric ceramics PZT-5H and BaTiO3. The analysis of the asymptotic in-plane field around a bi-material sharp notch is conducted utilizing the extended Lekhnitskii-Eshelby-Stroh formalism (Ting in Anisotropic elasticity, Oxford University Press. 1996. https://doi.org/10.1093/oso/9780195074475.001.0001). Subsequently, the boundary value problem with the prescribed spontaneous strain and polarization within the switching domain is solved and their influence on the in-plane intensity of singularity at the tip of interface crack is computed. The effects of the initial poling direction on the resulting variation of the energy release rates are discussed.
[klicova_slova] => Small-scale domain switching; Bi-material piezoelectric sharp notch; Expanded Lekhnitskii-Eshelby-Stroh formalism; Two-state H-integral
[klicova_slova_orig] => Small-scale domain switching; Bi-material piezoelectric sharp notch; Expanded Lekhnitskii-Eshelby-Stroh formalism; Two-state H-integral
[url] => https://link.springer.com/article/10.1007/s10704-024-00823-1
[oecd_obor_id] => 20501
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[vycet_osob] => HRSTKA, M.; KOTOUL, M.; PROFANT, T.; KIANICOVÁ, M.
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[citace_text] => HRSTKA, M.; KOTOUL, M.; PROFANT, T.; KIANICOVÁ, M. Small-scale domain switching near sharp piezoelectric bi-material notches. INTERNATIONAL JOURNAL OF FRACTURE, 2025, vol. 250, no. 1, p. 1-30. ISSN: 0376-9429.
[citace_html] => HRSTKA, M.; KOTOUL, M.; PROFANT, T.; KIANICOVÁ, M. Small-scale domain switching near sharp piezoelectric bi-material notches. INTERNATIONAL JOURNAL OF FRACTURE, 2025, vol. 250, no. 1, p. 1-30. ISSN: 0376-9429.
[citace_rtf] =>
[citace_bibtex] => @article{BUT197336,
author="Miroslav {Hrstka} and Michal {Kotoul} and Tomáš {Profant} and Marta {Kianicová}",
title="Small-scale domain switching near sharp piezoelectric bi-material notches",
journal="INTERNATIONAL JOURNAL OF FRACTURE",
year="2025",
volume="250",
number="1",
pages="1--30",
doi="10.1007/s10704-024-00823-1",
issn="0376-9429",
url="https://link.springer.com/article/10.1007/s10704-024-00823-1"
}
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[nazev_en] => Small-scale domain switching near sharp piezoelectric bi-material notches
[popis_en] => Assuming a scenario of small-scale domain switching, the dimensions and configuration of the domain switching region preceding a clearly defined primarily monoclinic piezoelectric bi-material notch are determined by embracing the energetic switching principle and micromechanical domain switching framework proposed by Hwang et al. (Acta Metall Mater 43(5):2073-2084, 1995. https://doi.org/10.1016/0956-7151(94)00379-V) for a given set of materials, structure, and polarization alignment. The piezoelectric bi-material under consideration comprises piezoelectric ceramics PZT-5H and BaTiO3. The analysis of the asymptotic in-plane field around a bi-material sharp notch is conducted utilizing the extended Lekhnitskii-Eshelby-Stroh formalism (Ting in Anisotropic elasticity, Oxford University Press. 1996. https://doi.org/10.1093/oso/9780195074475.001.0001). Subsequently, the boundary value problem with the prescribed spontaneous strain and polarization within the switching domain is solved and their influence on the in-plane intensity of singularity at the tip of interface crack is computed. The effects of the initial poling direction on the resulting variation of the energy release rates are discussed.
[klicova_slova_en] => Small-scale domain switching; Bi-material piezoelectric sharp notch; Expanded Lekhnitskii-Eshelby-Stroh formalism; Two-state H-integral
[vysledek_datum] => 2025-03-08T00:00:00+01:00
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[nazev] => Stochastic assessment of residual fatigue life of railway axles considering relevant critical factors
[nazev_orig] => Stochastic assessment of residual fatigue life of railway axles considering relevant critical factors
[duvernost_udaju_id] => S
[popis] => Statistical distribution of residual fatigue life (RFL) of railway axles under given loading was computed using the Monte Carlo method by considering random variation of the selected input parameters. Experimental data for the EA4T railway axle steel, the loading spectrum, the press fit loading and the residual stress induced by surface hardening were considered in the crack propagation simulations. Usually, the material properties measured by tensile tests are considered to be the most informative source of material data. Under fatigue loading, however, the crack growth rates near the threshold are the most critical data. Two important influencing factors on these crack growth rates are presented: first, the air humidity and, second, the near-surface residual stress. The typical variation of these parameters in operation may change the RFL by one or two orders of magnitude. Experimentally obtained crack growth thresholds and residual stress profiles are highly affected by the used methodology. Therefore, the obtained input data may be located anywhere within a large scatter, while the experimenters are completely unaware of it. This can lead to dangerously non-conservative situations, e.g. when the thresholds are measured in a laboratory under humid air conditions and then applied to predictions of RFLs of axles operated in winter in low air humidity. This is significant for the topic of inspection interval optimisation. The results of experiments done on real 1:1 railway axles were close to the most frequent value found in the histogram of the numerically computed RFLs.
[popis_orig] => Statistical distribution of residual fatigue life (RFL) of railway axles under given loading was computed using the Monte Carlo method by considering random variation of the selected input parameters. Experimental data for the EA4T railway axle steel, the loading spectrum, the press fit loading and the residual stress induced by surface hardening were considered in the crack propagation simulations. Usually, the material properties measured by tensile tests are considered to be the most informative source of material data. Under fatigue loading, however, the crack growth rates near the threshold are the most critical data. Two important influencing factors on these crack growth rates are presented: first, the air humidity and, second, the near-surface residual stress. The typical variation of these parameters in operation may change the RFL by one or two orders of magnitude. Experimentally obtained crack growth thresholds and residual stress profiles are highly affected by the used methodology. Therefore, the obtained input data may be located anywhere within a large scatter, while the experimenters are completely unaware of it. This can lead to dangerously non-conservative situations, e.g. when the thresholds are measured in a laboratory under humid air conditions and then applied to predictions of RFLs of axles operated in winter in low air humidity. This is significant for the topic of inspection interval optimisation. The results of experiments done on real 1:1 railway axles were close to the most frequent value found in the histogram of the numerically computed RFLs.
[klicova_slova] => Residual fatigue life; Railway axles; Fatigue crack Growth threshold; Air humidity; Monte Carlo method
[klicova_slova_orig] => Residual fatigue life; Railway axles; Fatigue crack Growth threshold; Air humidity; Monte Carlo method
[url] => https://link.springer.com/article/10.1007/s40534-025-00376-6
[oecd_obor_id] => 20104
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[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
[schvalil_id] => 1770
[schvaleno] => 2026-02-18
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[vycet_osob] => TICHOŇ, D.; VOJTEK, T.; DLHÝ, P.; POKORNÝ, P.; NÁHLÍK, L.; CANTELI, A.; FAJKOŠ, R.; PETER, O.; HUTAŘ, P.
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[identifikator_popis] => ISSN - Railway Engineering Science (CN)
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[citace_text] => TICHOŇ, D.; VOJTEK, T.; DLHÝ, P.; POKORNÝ, P.; NÁHLÍK, L.; CANTELI, A.; FAJKOŠ, R.; PETER, O.; HUTAŘ, P. Stochastic assessment of residual fatigue life of railway axles considering relevant critical factors. Railway Engineering Science, 2026, vol. 33, no. 1, p. 1-24.
[citace_html] => TICHOŇ, D.; VOJTEK, T.; DLHÝ, P.; POKORNÝ, P.; NÁHLÍK, L.; CANTELI, A.; FAJKOŠ, R.; PETER, O.; HUTAŘ, P. Stochastic assessment of residual fatigue life of railway axles considering relevant critical factors. Railway Engineering Science, 2026, vol. 33, no. 1, p. 1-24.
[citace_rtf] =>
[citace_bibtex] => @article{BUT197486,
author="Dušan {Tichoň} and Tomáš {Vojtek} and Pavol {Dlhý} and Pavel {Pokorný} and Luboš {Náhlík} and Alfonso Fernández {Canteli} and Rostislav {Fajkoš} and Ondřej {Peter} and Pavel {Hutař}",
title="Stochastic assessment of residual fatigue life of railway axles considering relevant critical factors",
journal="Railway Engineering Science",
year="2026",
volume="33",
number="1",
pages="1--24",
doi="10.1007/s40534-025-00376-6",
issn="2662-4745",
url="https://link.springer.com/article/10.1007/s40534-025-00376-6"
}
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[poznamka_metriky] =>
[nazev_en] => Stochastic assessment of residual fatigue life of railway axles considering relevant critical factors
[popis_en] => Statistical distribution of residual fatigue life (RFL) of railway axles under given loading was computed using the Monte Carlo method by considering random variation of the selected input parameters. Experimental data for the EA4T railway axle steel, the loading spectrum, the press fit loading and the residual stress induced by surface hardening were considered in the crack propagation simulations. Usually, the material properties measured by tensile tests are considered to be the most informative source of material data. Under fatigue loading, however, the crack growth rates near the threshold are the most critical data. Two important influencing factors on these crack growth rates are presented: first, the air humidity and, second, the near-surface residual stress. The typical variation of these parameters in operation may change the RFL by one or two orders of magnitude. Experimentally obtained crack growth thresholds and residual stress profiles are highly affected by the used methodology. Therefore, the obtained input data may be located anywhere within a large scatter, while the experimenters are completely unaware of it. This can lead to dangerously non-conservative situations, e.g. when the thresholds are measured in a laboratory under humid air conditions and then applied to predictions of RFLs of axles operated in winter in low air humidity. This is significant for the topic of inspection interval optimisation. The results of experiments done on real 1:1 railway axles were close to the most frequent value found in the histogram of the numerically computed RFLs.
[klicova_slova_en] => Residual fatigue life; Railway axles; Fatigue crack Growth threshold; Air humidity; Monte Carlo method
[vysledek_datum] => 2026-03-04T00:00:00+01:00
)
[6] => Array
(
[vysledek_id] => 197520
[vysledek_druh_id] => ARTWOS
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[vysledek_rok] => 2025
[nazev] => Computational modeling of bone allograft reconstruction following femoral shaft tumor resection: Investigating the impact of supplementary plate fixation
[nazev_orig] => Computational modeling of bone allograft reconstruction following femoral shaft tumor resection: Investigating the impact of supplementary plate fixation
[duvernost_udaju_id] => S
[popis] => Background and objective The use of bone allograft reconstructions after tumor resection can introduce significant complications. Stable fixation is required to decrease the incidence of mechanical complications of segmental bone allografts. The purpose of the present study is to compare plating fixation methods of diaphyseal allografts after intercalary resection of the femur. Methods We created four defined fixation models using plates and/or intramedullary polymethylmethacrylate (PMMA) to simulate typical bone tumor resection with intercalary allograft reconstruction. One angularly stable plate (DFP) with 13 locking screws and fresh frozen allografts (labeled "I") were used for bone reconstruction. Three modified reconstructions were created: "II" included a supplementary plate (SP) with four locking screws, "III" was augmented with intramedullary PMMA in the allograft, and "IV" combined intramedullary PMMA and both plates. We applied a load model that simulates partial weight bearing on the lower limb to simulate the load during postoperative rehabilitation. Results The highest stress in the DFP occurred at the allograft-bone transition, with variant IV reaching 297 MPa. PMMA augmentation reduced median interfragmentary motion (IFM) and sliding distances, with variant III achieving the lowest distal sliding distance (0.9 mu m) in the distal area. Supplementary plate fixation reduced maximal and median proximal IFM distances (86.9 mu m in variant II vs. 116.0 mu m in variant I) but increased sliding distances (23.7 mu m in variant II vs. 0.6 mu m in variant I). Conclusions PMMA augmentation reduces IFM and sliding distances, enhancing rigidity, particularly in the distal area. Supplementary plate fixation decreases IFM distances in the proximal area but increases sliding distances in the same region. Variants III and IV demonstrate lower IFM and sliding distances in the distal area overall. Variant III shows very low sliding distances in both distal and proximal areas. Variant IV combines improved firmness with slightly higher stress levels.
[popis_orig] => Background and objective The use of bone allograft reconstructions after tumor resection can introduce significant complications. Stable fixation is required to decrease the incidence of mechanical complications of segmental bone allografts. The purpose of the present study is to compare plating fixation methods of diaphyseal allografts after intercalary resection of the femur. Methods We created four defined fixation models using plates and/or intramedullary polymethylmethacrylate (PMMA) to simulate typical bone tumor resection with intercalary allograft reconstruction. One angularly stable plate (DFP) with 13 locking screws and fresh frozen allografts (labeled "I") were used for bone reconstruction. Three modified reconstructions were created: "II" included a supplementary plate (SP) with four locking screws, "III" was augmented with intramedullary PMMA in the allograft, and "IV" combined intramedullary PMMA and both plates. We applied a load model that simulates partial weight bearing on the lower limb to simulate the load during postoperative rehabilitation. Results The highest stress in the DFP occurred at the allograft-bone transition, with variant IV reaching 297 MPa. PMMA augmentation reduced median interfragmentary motion (IFM) and sliding distances, with variant III achieving the lowest distal sliding distance (0.9 mu m) in the distal area. Supplementary plate fixation reduced maximal and median proximal IFM distances (86.9 mu m in variant II vs. 116.0 mu m in variant I) but increased sliding distances (23.7 mu m in variant II vs. 0.6 mu m in variant I). Conclusions PMMA augmentation reduces IFM and sliding distances, enhancing rigidity, particularly in the distal area. Supplementary plate fixation decreases IFM distances in the proximal area but increases sliding distances in the same region. Variants III and IV demonstrate lower IFM and sliding distances in the distal area overall. Variant III shows very low sliding distances in both distal and proximal areas. Variant IV combines improved firmness with slightly higher stress levels.
[klicova_slova] => computational modeling, finite element method, bone allograft, bone tumor, bone cement augmentation, IFM-Cal
[klicova_slova_orig] => computational modeling, finite element method, bone allograft, bone tumor, bone cement augmentation, IFM-Cal
[url] => https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0316719
[oecd_obor_id] => 10700
[odpovedny_utvar_id] => 157
[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
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[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
[schvalil_id] => 1770
[schvaleno] => 2025-04-14
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[vycet_osob] => BOHÁČ, P.; APOSTOLOPOULOS, V.; MARCIÁN, P.; TOMÁŠ, T.; MAHDAL, M.; NÁVRAT, T.
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[kod_doi] => 10.1371/journal.pone.0316719
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[stav] => Approved
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[identifikator] => ISSN 1932-6203
[identifikator_popis] => ISSN - PLoS One (US)
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[citace_text] => BOHÁČ, P.; APOSTOLOPOULOS, V.; MARCIÁN, P.; TOMÁŠ, T.; MAHDAL, M.; NÁVRAT, T. Computational modeling of bone allograft reconstruction following femoral shaft tumor resection: Investigating the impact of supplementary plate fixation. PLoS One, 2025, vol. 20, no. 2, 20 p. ISSN: 1932-6203.
[citace_html] => BOHÁČ, P.; APOSTOLOPOULOS, V.; MARCIÁN, P.; TOMÁŠ, T.; MAHDAL, M.; NÁVRAT, T. Computational modeling of bone allograft reconstruction following femoral shaft tumor resection: Investigating the impact of supplementary plate fixation. PLoS One, 2025, vol. 20, no. 2, 20 p. ISSN: 1932-6203.
[citace_rtf] =>
[citace_bibtex] => @article{BUT197520,
author="Petr {Boháč} and Vasileios {Apostolopoulos} and Petr {Marcián} and Tomáš {Tomáš} and Michal {Mahdal} and Tomáš {Návrat}",
title="Computational modeling of bone allograft reconstruction following femoral shaft tumor resection: Investigating the impact of supplementary plate fixation",
journal="PLoS One",
year="2025",
volume="20",
number="2",
pages="20",
doi="10.1371/journal.pone.0316719",
issn="1932-6203",
url="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0316719"
}
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[nazev_en] => Computational modeling of bone allograft reconstruction following femoral shaft tumor resection: Investigating the impact of supplementary plate fixation
[popis_en] => Background and objective The use of bone allograft reconstructions after tumor resection can introduce significant complications. Stable fixation is required to decrease the incidence of mechanical complications of segmental bone allografts. The purpose of the present study is to compare plating fixation methods of diaphyseal allografts after intercalary resection of the femur. Methods We created four defined fixation models using plates and/or intramedullary polymethylmethacrylate (PMMA) to simulate typical bone tumor resection with intercalary allograft reconstruction. One angularly stable plate (DFP) with 13 locking screws and fresh frozen allografts (labeled "I") were used for bone reconstruction. Three modified reconstructions were created: "II" included a supplementary plate (SP) with four locking screws, "III" was augmented with intramedullary PMMA in the allograft, and "IV" combined intramedullary PMMA and both plates. We applied a load model that simulates partial weight bearing on the lower limb to simulate the load during postoperative rehabilitation. Results The highest stress in the DFP occurred at the allograft-bone transition, with variant IV reaching 297 MPa. PMMA augmentation reduced median interfragmentary motion (IFM) and sliding distances, with variant III achieving the lowest distal sliding distance (0.9 mu m) in the distal area. Supplementary plate fixation reduced maximal and median proximal IFM distances (86.9 mu m in variant II vs. 116.0 mu m in variant I) but increased sliding distances (23.7 mu m in variant II vs. 0.6 mu m in variant I). Conclusions PMMA augmentation reduces IFM and sliding distances, enhancing rigidity, particularly in the distal area. Supplementary plate fixation decreases IFM distances in the proximal area but increases sliding distances in the same region. Variants III and IV demonstrate lower IFM and sliding distances in the distal area overall. Variant III shows very low sliding distances in both distal and proximal areas. Variant IV combines improved firmness with slightly higher stress levels.
[klicova_slova_en] => computational modeling, finite element method, bone allograft, bone tumor, bone cement augmentation, IFM-Cal
[vysledek_datum] => 2025-02-06T00:00:00+01:00
)
[7] => Array
(
[vysledek_id] => 197698
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[nazev] => Plasticity and ductile fracture of conventionally manufactured AISI 316L compared to one produced by selective laser melting with and without machining
[nazev_orig] => Plasticity and ductile fracture of conventionally manufactured AISI 316L compared to one produced by selective laser melting with and without machining
[duvernost_udaju_id] => S
[popis] => The utilization of additively manufactured materials has increased. Knowledge of the behaviour of this prepared material is crucial to designing safe structures and products. However, the properties are different from those of conventionally produced materials. Therefore, the focus is on widely used AISI 316L austenitic stainless steel to present its plasticity and ductile fracture, crucial in decision-making within the design process. The additively manufactured specimens were machined and also left as built, as it is not always economical to machine all the surfaces, which can even be impossible in some cases. However, it has been shown that the machining can be detrimental in some cases. First of all, the stress-strain behaviour was studied in order to simulate all the experiments. Then, several ductile fracture criteria were calibrated using these simulations and mutually compared for three studied material states-conventionally wrought (rolled), as built and machined after printing. The material prepared by the laser powder bed fusion technology exhibited higher yield strength compared to that of the wrought material. The results further show a significant difference when it comes to ductility, which is highest for wrought material and lowest for printed material that was machined. The study also provides information on the mechanisms of hardening and failure with fractography performed to support the findings for widespread austenitic stainless steel.
[popis_orig] => The utilization of additively manufactured materials has increased. Knowledge of the behaviour of this prepared material is crucial to designing safe structures and products. However, the properties are different from those of conventionally produced materials. Therefore, the focus is on widely used AISI 316L austenitic stainless steel to present its plasticity and ductile fracture, crucial in decision-making within the design process. The additively manufactured specimens were machined and also left as built, as it is not always economical to machine all the surfaces, which can even be impossible in some cases. However, it has been shown that the machining can be detrimental in some cases. First of all, the stress-strain behaviour was studied in order to simulate all the experiments. Then, several ductile fracture criteria were calibrated using these simulations and mutually compared for three studied material states-conventionally wrought (rolled), as built and machined after printing. The material prepared by the laser powder bed fusion technology exhibited higher yield strength compared to that of the wrought material. The results further show a significant difference when it comes to ductility, which is highest for wrought material and lowest for printed material that was machined. The study also provides information on the mechanisms of hardening and failure with fractography performed to support the findings for widespread austenitic stainless steel.
[klicova_slova] => 3D metal printing; laser beam; powder metallurgy; rapid prototyping; selective laser melting
[klicova_slova_orig] => 3D metal printing; laser beam; powder metallurgy; rapid prototyping; selective laser melting
[url] => https://link.springer.com/article/10.1007/s00170-025-15387-0
[oecd_obor_id] => 20205
[odpovedny_utvar_id] => 157
[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
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[nadrazena_soucast_id] => 4
[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
[schvalil_id] => 2810
[schvaleno] => 2025-04-15
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[vycet_osob] => ŠEBEK, F.; KUBÍK, P.; ZAPLETAL, J.; KUNČICKÁ, L.; KOCICH, R.; PAGÁČ, M.; PAŠKA, Z.; FOJTÍK, F.; HALAMA, R.
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[upravil] => Informační systém Automat
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[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISSN 0268-3768
[identifikator_popis] => ISSN - International Journal of Advanced Manufacturing Technology (GB)
[riv_dodavka_id] => 3596
[riv_dodavka_oznaceni] => RIV26-GA0-26210___
[riv_dodavka_rok] => 2026
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[citace_text] => ŠEBEK, F.; KUBÍK, P.; ZAPLETAL, J.; KUNČICKÁ, L.; KOCICH, R.; PAGÁČ, M.; PAŠKA, Z.; FOJTÍK, F.; HALAMA, R. Plasticity and ductile fracture of conventionally manufactured AISI 316L compared to one produced by selective laser melting with and without machining. International Journal of Advanced Manufacturing Technology, 2025, vol. 137, no. 7-8, p. 3933-3948. ISSN: 0268-3768.
[citace_html] => ŠEBEK, F.; KUBÍK, P.; ZAPLETAL, J.; KUNČICKÁ, L.; KOCICH, R.; PAGÁČ, M.; PAŠKA, Z.; FOJTÍK, F.; HALAMA, R. Plasticity and ductile fracture of conventionally manufactured AISI 316L compared to one produced by selective laser melting with and without machining. International Journal of Advanced Manufacturing Technology, 2025, vol. 137, no. 7-8, p. 3933-3948. ISSN: 0268-3768.
[citace_rtf] =>
[citace_bibtex] => @article{BUT197698,
author="František {Šebek} and Petr {Kubík} and Josef {Zapletal} and Lenka {Kunčická} and Radim {Kocich} and Marek {Pagáč} and Zbyněk {Paška} and František {Fojtík} and Radim {Halama}",
title="Plasticity and ductile fracture of conventionally manufactured AISI 316L compared to one produced by selective laser melting with and without machining",
journal="International Journal of Advanced Manufacturing Technology",
year="2025",
volume="137",
number="7-8",
pages="3933--3948",
doi="10.1007/s00170-025-15387-0",
issn="0268-3768",
url="https://link.springer.com/article/10.1007/s00170-025-15387-0"
}
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[nazev_en] => Plasticity and ductile fracture of conventionally manufactured AISI 316L compared to one produced by selective laser melting with and without machining
[popis_en] => The utilization of additively manufactured materials has increased. Knowledge of the behaviour of this prepared material is crucial to designing safe structures and products. However, the properties are different from those of conventionally produced materials. Therefore, the focus is on widely used AISI 316L austenitic stainless steel to present its plasticity and ductile fracture, crucial in decision-making within the design process. The additively manufactured specimens were machined and also left as built, as it is not always economical to machine all the surfaces, which can even be impossible in some cases. However, it has been shown that the machining can be detrimental in some cases. First of all, the stress-strain behaviour was studied in order to simulate all the experiments. Then, several ductile fracture criteria were calibrated using these simulations and mutually compared for three studied material states-conventionally wrought (rolled), as built and machined after printing. The material prepared by the laser powder bed fusion technology exhibited higher yield strength compared to that of the wrought material. The results further show a significant difference when it comes to ductility, which is highest for wrought material and lowest for printed material that was machined. The study also provides information on the mechanisms of hardening and failure with fractography performed to support the findings for widespread austenitic stainless steel.
[klicova_slova_en] => 3D metal printing; laser beam; powder metallurgy; rapid prototyping; selective laser melting
[vysledek_datum] => 2025-03-20T00:00:00+01:00
)
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(
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[nazev] => Backstress shift modelling concept for improving uniaxial ratcheting predictions for wrought 304 stainless steel and additively manufactured Inconel 718
[nazev_orig] => Backstress shift modelling concept for improving uniaxial ratcheting predictions for wrought 304 stainless steel and additively manufactured Inconel 718
[duvernost_udaju_id] => S
[popis] => The Chaboche model is one of the widely used models, but it still shows limitations in predicting various complex responses. For example, issues in predicting ratcheting responses of metals and alloys under stress-controlled loading, especially under uniaxial cyclic loading, have been demonstrated. Therefore, this study evaluates the performance of the Chaboche model under uniaxial cyclic loading with an emphasis given to the simulation of uniaxial ratcheting responses. A modification to the model is proposed to enhance its prediction of the uniaxial ratcheting response for a wide range of ratcheting rates. The modification technique is called the backstress shift model, developed on the basis of experimental observations of the similarity between the strain- and stress-controlled hysteresis loops. A backstress memory surface is introduced and its material parameters are calibrated using responses of stainless steel 304 and Inconel 718 superalloy. For this study, data for steel are collected from the literature and experiments are performed on superalloy to acquire a set of data for development and validation of the proposed model. The modified model demonstrates better predictability of the uniaxial ratcheting responses compared to the Chaboche model with the threshold, especially for the additively manufactured nickel-based superalloy. The modified model also works well for the wrought 304 stainless steel.
[popis_orig] => The Chaboche model is one of the widely used models, but it still shows limitations in predicting various complex responses. For example, issues in predicting ratcheting responses of metals and alloys under stress-controlled loading, especially under uniaxial cyclic loading, have been demonstrated. Therefore, this study evaluates the performance of the Chaboche model under uniaxial cyclic loading with an emphasis given to the simulation of uniaxial ratcheting responses. A modification to the model is proposed to enhance its prediction of the uniaxial ratcheting response for a wide range of ratcheting rates. The modification technique is called the backstress shift model, developed on the basis of experimental observations of the similarity between the strain- and stress-controlled hysteresis loops. A backstress memory surface is introduced and its material parameters are calibrated using responses of stainless steel 304 and Inconel 718 superalloy. For this study, data for steel are collected from the literature and experiments are performed on superalloy to acquire a set of data for development and validation of the proposed model. The modified model demonstrates better predictability of the uniaxial ratcheting responses compared to the Chaboche model with the threshold, especially for the additively manufactured nickel-based superalloy. The modified model also works well for the wrought 304 stainless steel.
[klicova_slova] => Cyclic hardening; Cyclic softening; Evolutionary algorithm; Isotropic hardening; Uniaxial ratcheting
[klicova_slova_orig] => Cyclic hardening; Cyclic softening; Evolutionary algorithm; Isotropic hardening; Uniaxial ratcheting
[url] => https://www.sciencedirect.com/science/article/pii/S0997753825002049
[oecd_obor_id] => 20302
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[originalni_jazyk] => en
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[schvaleno] => 2025-08-06
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[vycet_osob] => ADAMEC, T.; HASSAN, T.; ZAPLETAL, J.; KONDEPATI, S.; ŠEBEK, F.
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[znamka] =>
[kategorie_nazev] => Publication results
[druh_nazev] => WoS Article
[druh_popis] => Peer-reviewed article included in Web of Science database as as an “Article”, “Review” or “Letter”
[stav] => Approved
[vysledek_kategorie_id] => PV
[vysledek_system_kategorie_id] => PU
[vysledek_stav_id] => 3
[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
[ins_uid] => 999999
[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISSN 0997-7538
[identifikator_popis] => ISSN - European journal of mechanics, A, Solids (FR)
[riv_dodavka_id] => 3596
[riv_dodavka_oznaceni] => RIV26-GA0-26210___
[riv_dodavka_rok] => 2026
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[citace_text] => ADAMEC, T.; HASSAN, T.; ZAPLETAL, J.; KONDEPATI, S.; ŠEBEK, F. Backstress shift modelling concept for improving uniaxial ratcheting predictions for wrought 304 stainless steel and additively manufactured Inconel 718. European journal of mechanics, A, Solids, 2025, vol. 114, no. 1, p. 1-17. ISSN: 0997-7538.
[citace_html] => ADAMEC, T.; HASSAN, T.; ZAPLETAL, J.; KONDEPATI, S.; ŠEBEK, F. Backstress shift modelling concept for improving uniaxial ratcheting predictions for wrought 304 stainless steel and additively manufactured Inconel 718. European journal of mechanics, A, Solids, 2025, vol. 114, no. 1, p. 1-17. ISSN: 0997-7538.
[citace_rtf] =>
[citace_bibtex] => @article{BUT198326,
author="Tomáš {Adamec} and Tasnim {Hassan} and Josef {Zapletal} and Sudhir Kumar {Kondepati} and František {Šebek}",
title="Backstress shift modelling concept for improving uniaxial ratcheting predictions for wrought 304 stainless steel and additively manufactured Inconel 718",
journal="European journal of mechanics, A, Solids",
year="2025",
volume="114",
number="1",
pages="1--17",
doi="10.1016/j.euromechsol.2025.105770",
issn="0997-7538",
url="https://www.sciencedirect.com/science/article/pii/S0997753825002049"
}
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[oecd_tree_oblast_nazev] => 2. Engineering and Technology
[oecd_tree_obor_id] => 20300
[oecd_tree_obor_nazev] => 2.3 Mechanical engineering
[oecd_tree_podobor_id] => 20302
[oecd_tree_podobor_nazev] => Applied mechanics
[poznamka_metriky] =>
[nazev_en] => Backstress shift modelling concept for improving uniaxial ratcheting predictions for wrought 304 stainless steel and additively manufactured Inconel 718
[popis_en] => The Chaboche model is one of the widely used models, but it still shows limitations in predicting various complex responses. For example, issues in predicting ratcheting responses of metals and alloys under stress-controlled loading, especially under uniaxial cyclic loading, have been demonstrated. Therefore, this study evaluates the performance of the Chaboche model under uniaxial cyclic loading with an emphasis given to the simulation of uniaxial ratcheting responses. A modification to the model is proposed to enhance its prediction of the uniaxial ratcheting response for a wide range of ratcheting rates. The modification technique is called the backstress shift model, developed on the basis of experimental observations of the similarity between the strain- and stress-controlled hysteresis loops. A backstress memory surface is introduced and its material parameters are calibrated using responses of stainless steel 304 and Inconel 718 superalloy. For this study, data for steel are collected from the literature and experiments are performed on superalloy to acquire a set of data for development and validation of the proposed model. The modified model demonstrates better predictability of the uniaxial ratcheting responses compared to the Chaboche model with the threshold, especially for the additively manufactured nickel-based superalloy. The modified model also works well for the wrought 304 stainless steel.
[klicova_slova_en] => Cyclic hardening; Cyclic softening; Evolutionary algorithm; Isotropic hardening; Uniaxial ratcheting
[vysledek_datum] => 2025-11-01T00:00:00+01:00
)
[9] => Array
(
[vysledek_id] => 198446
[vysledek_druh_id] => ARTWOS
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[vysledek_rok] => 2025
[nazev] => Mechanical comparison of cortical button fixation, interference screw and keyhole techniques in subpectoral biceps tenodesis, including digital image correlation assessment of bone surrounding the drill hole
[nazev_orig] => Mechanical comparison of cortical button fixation, interference screw and keyhole techniques in subpectoral biceps tenodesis, including digital image correlation assessment of bone surrounding the drill hole
[duvernost_udaju_id] => S
[popis] => PurposeSubpectoral biceps tenodesis is a widely used surgical technique to relieve pain and restore function in the shoulder by securing the long head of the biceps tendon. This study aimed to evaluate the mechanical performance of three fixation techniques using cortical button, interference screw and keyhole methods by assessing their strength, durability and strain distribution, incorporating the novel application of digital image correlation (DIC).MethodsThirty fresh porcine bone-tendon specimens were allocated evenly among the fixation techniques. Biomechanical testing involved cyclic axial loading (10-100 N) for 500 cycles, followed by load-to-failure testing using a universal testing machine. DIC analysis assessed strain distribution around the bone drill site. Statistical comparisons of displacement, load-to-failure and strain patterns were performed.ResultsCortical button fixation demonstrated the highest average load-to-failure at 353 +/- 45 N, with all specimens completing 500 cycles and showing the least variability. In comparison, interference screw fixation had the lowest average load-to-failure (271 +/- 71 N) with two failures occurring before 500 cycles, and the keyhole technique showed intermediate performance at 319 +/- 45 N, also with two early failures. Cyclic displacement after 500 cycles was lowest for the interference screw (3.16 +/- 0.52 mm), followed by the keyhole (11.51 +/- 2.08 mm), and highest for the cortical button (13.84 +/- 1.90 mm). Displacement range after 500 cycles was also lowest in the interference screw group (0.62 +/- 0.05 mm), compared to the cortical button (0.88 +/- 0.07 mm) and keyhole (0.91 +/- 0.23 mm). DIC revealed the highest maximum first principal strain around cortical button fixation (0.21%), followed by interference screw (0.16%) and keyhole (0.13%).ConclusionCortical button fixation demonstrated the highest load-to-failure and the lowest variability, indicating mechanical reliability. The interference screw and keyhole techniques showed comparable load-to-failure values and cyclic displacement but exhibited greater variability. DIC analysis revealed higher localized strain around the cortical button fixation, whereas the interference screw and keyhole techniques displayed more evenly distributed strain.Level of EvidenceLevel V.
[popis_orig] => PurposeSubpectoral biceps tenodesis is a widely used surgical technique to relieve pain and restore function in the shoulder by securing the long head of the biceps tendon. This study aimed to evaluate the mechanical performance of three fixation techniques using cortical button, interference screw and keyhole methods by assessing their strength, durability and strain distribution, incorporating the novel application of digital image correlation (DIC).MethodsThirty fresh porcine bone-tendon specimens were allocated evenly among the fixation techniques. Biomechanical testing involved cyclic axial loading (10-100 N) for 500 cycles, followed by load-to-failure testing using a universal testing machine. DIC analysis assessed strain distribution around the bone drill site. Statistical comparisons of displacement, load-to-failure and strain patterns were performed.ResultsCortical button fixation demonstrated the highest average load-to-failure at 353 +/- 45 N, with all specimens completing 500 cycles and showing the least variability. In comparison, interference screw fixation had the lowest average load-to-failure (271 +/- 71 N) with two failures occurring before 500 cycles, and the keyhole technique showed intermediate performance at 319 +/- 45 N, also with two early failures. Cyclic displacement after 500 cycles was lowest for the interference screw (3.16 +/- 0.52 mm), followed by the keyhole (11.51 +/- 2.08 mm), and highest for the cortical button (13.84 +/- 1.90 mm). Displacement range after 500 cycles was also lowest in the interference screw group (0.62 +/- 0.05 mm), compared to the cortical button (0.88 +/- 0.07 mm) and keyhole (0.91 +/- 0.23 mm). DIC revealed the highest maximum first principal strain around cortical button fixation (0.21%), followed by interference screw (0.16%) and keyhole (0.13%).ConclusionCortical button fixation demonstrated the highest load-to-failure and the lowest variability, indicating mechanical reliability. The interference screw and keyhole techniques showed comparable load-to-failure values and cyclic displacement but exhibited greater variability. DIC analysis revealed higher localized strain around the cortical button fixation, whereas the interference screw and keyhole techniques displayed more evenly distributed strain.Level of EvidenceLevel V.
[klicova_slova] => biceps tenodesis; cortical button; digital image correlation; interference screw; keyhole technique; subpectoral tenodesis
[klicova_slova_orig] => biceps tenodesis; cortical button; digital image correlation; interference screw; keyhole technique; subpectoral tenodesis
[url] => https://esskajournals.onlinelibrary.wiley.com/doi/full/10.1002/jeo2.70313
[oecd_obor_id] => 30200
[odpovedny_utvar_id] => 157
[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
[odpovedny_utvar_zkratka] => ISMMB
[nadrazena_soucast_id] => 4
[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
[schvalil_id] => 1770
[schvaleno] => 2025-09-09
[vykazovat_riv] => 1
[vykazovat_riv_zmeny] => 1
[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => MARTÍNEK, L.; BOHÁČ, P.; APOSTOLOPOULOS, V.; NÁVRAT, T.; LANGER, R.; NACHTNEBL, L.; TOMÁŠ, T.
[pocet_tvurcu] => 7
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[kod_doi] => 10.1002/jeo2.70313
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[znamka] =>
[kategorie_nazev] => Publication results
[druh_nazev] => WoS Article
[druh_popis] => Peer-reviewed article included in Web of Science database as as an “Article”, “Review” or “Letter”
[stav] => Approved
[vysledek_kategorie_id] => PV
[vysledek_system_kategorie_id] => PU
[vysledek_stav_id] => 3
[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
[ins_uid] => 999999
[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] =>
[identifikator_popis] =>
[riv_dodavka_id] => 3554
[riv_dodavka_oznaceni] => RIV26-MSM-26210___
[riv_dodavka_rok] => 2026
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[citace_text] => MARTÍNEK, L.; BOHÁČ, P.; APOSTOLOPOULOS, V.; NÁVRAT, T.; LANGER, R.; NACHTNEBL, L.; TOMÁŠ, T. Mechanical comparison of cortical button fixation, interference screw and keyhole techniques in subpectoral biceps tenodesis, including digital image correlation assessment of bone surrounding the drill hole. Journal of experimental orthopaedics, 2025, vol. 12, no. 3, p. 1-11. ISSN: 2197-1153.
[citace_html] => MARTÍNEK, L.; BOHÁČ, P.; APOSTOLOPOULOS, V.; NÁVRAT, T.; LANGER, R.; NACHTNEBL, L.; TOMÁŠ, T. Mechanical comparison of cortical button fixation, interference screw and keyhole techniques in subpectoral biceps tenodesis, including digital image correlation assessment of bone surrounding the drill hole. Journal of experimental orthopaedics, 2025, vol. 12, no. 3, p. 1-11. ISSN: 2197-1153.
[citace_rtf] =>
[citace_bibtex] => @article{BUT198446,
author="Lukáš {Martínek} and Petr {Boháč} and Vasileios {Apostolopoulos} and Tomáš {Návrat} and Robert {Langer} and Luboš {Nachtnebl} and Tomáš {Tomáš}",
title="Mechanical comparison of cortical button fixation, interference screw and keyhole techniques in subpectoral biceps tenodesis, including digital image correlation assessment of bone surrounding the drill hole",
journal="Journal of experimental orthopaedics",
year="2025",
volume="12",
number="3",
pages="1--11",
doi="10.1002/jeo2.70313",
url="https://esskajournals.onlinelibrary.wiley.com/doi/full/10.1002/jeo2.70313"
}
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[nazev_en] => Mechanical comparison of cortical button fixation, interference screw and keyhole techniques in subpectoral biceps tenodesis, including digital image correlation assessment of bone surrounding the drill hole
[popis_en] => PurposeSubpectoral biceps tenodesis is a widely used surgical technique to relieve pain and restore function in the shoulder by securing the long head of the biceps tendon. This study aimed to evaluate the mechanical performance of three fixation techniques using cortical button, interference screw and keyhole methods by assessing their strength, durability and strain distribution, incorporating the novel application of digital image correlation (DIC).MethodsThirty fresh porcine bone-tendon specimens were allocated evenly among the fixation techniques. Biomechanical testing involved cyclic axial loading (10-100 N) for 500 cycles, followed by load-to-failure testing using a universal testing machine. DIC analysis assessed strain distribution around the bone drill site. Statistical comparisons of displacement, load-to-failure and strain patterns were performed.ResultsCortical button fixation demonstrated the highest average load-to-failure at 353 +/- 45 N, with all specimens completing 500 cycles and showing the least variability. In comparison, interference screw fixation had the lowest average load-to-failure (271 +/- 71 N) with two failures occurring before 500 cycles, and the keyhole technique showed intermediate performance at 319 +/- 45 N, also with two early failures. Cyclic displacement after 500 cycles was lowest for the interference screw (3.16 +/- 0.52 mm), followed by the keyhole (11.51 +/- 2.08 mm), and highest for the cortical button (13.84 +/- 1.90 mm). Displacement range after 500 cycles was also lowest in the interference screw group (0.62 +/- 0.05 mm), compared to the cortical button (0.88 +/- 0.07 mm) and keyhole (0.91 +/- 0.23 mm). DIC revealed the highest maximum first principal strain around cortical button fixation (0.21%), followed by interference screw (0.16%) and keyhole (0.13%).ConclusionCortical button fixation demonstrated the highest load-to-failure and the lowest variability, indicating mechanical reliability. The interference screw and keyhole techniques showed comparable load-to-failure values and cyclic displacement but exhibited greater variability. DIC analysis revealed higher localized strain around the cortical button fixation, whereas the interference screw and keyhole techniques displayed more evenly distributed strain.Level of EvidenceLevel V.
[klicova_slova_en] => biceps tenodesis; cortical button; digital image correlation; interference screw; keyhole technique; subpectoral tenodesis
[vysledek_datum] => 2025-07-02T00:00:00+02:00
)
[10] => Array
(
[vysledek_id] => 198447
[vysledek_druh_id] => ARTWOS
[ex_vysledek_id] => 156854
[vysledek_rok] => 2025
[nazev] => Comparison of silicone impressions with intraoral 3D scans in newborns with cleft lip and palate
[nazev_orig] => Comparison of silicone impressions with intraoral 3D scans in newborns with cleft lip and palate
[duvernost_udaju_id] => S
[popis] => Statement of problem. Intraoral scanning is currently becoming the standard method for imaging the maxilla in patients with cleft lip and palate. However, the reliability of intraoral scans compared with traditional conventional impression methods has not yet been sufficiently described and examined in detail in newborns with severe types of cleft lip and palate. Purpose. The purpose of this clinical study was to assess the reliability and agreement between intraoral scanning and traditional impression methods for maxillary measurements in newborns with unilateral and bilateral cleft lip and palate (U/BCLP). A secondary aim was to evaluate the consistency of maxillary measurements obtained with and without general anesthesia. Material and methods. Six newborns with cleft lip and palate underwent 4 maxillary impression methods (silicone impression and 3-dimensional (3D) scan, with and without anesthesia). Intra-and inter-observer reliability was assessed by 3 clinicians using intraclass correlation coefficient, median absolute deviation, and median relative deviation (alpha=.05). Results. The intraclass correlation coefficient values for both inter-observer and intra-observer reliability indicated excellent agreement (ICC>.90, P<.05) for maxillary dimension measurements. Acceptable variability was observed because of differences in reference point identification by clinicians and across data collection methods. Conclusions. When assessing the maxilla in U/BCLP patients, both intraoral scanner and traditional impression techniques showed excellent reliability and agreement in measurements, whether performed while the newborns were awake or under general anesthesia. (J Prosthet Dent 2025;134:275-282)
[popis_orig] => Statement of problem. Intraoral scanning is currently becoming the standard method for imaging the maxilla in patients with cleft lip and palate. However, the reliability of intraoral scans compared with traditional conventional impression methods has not yet been sufficiently described and examined in detail in newborns with severe types of cleft lip and palate. Purpose. The purpose of this clinical study was to assess the reliability and agreement between intraoral scanning and traditional impression methods for maxillary measurements in newborns with unilateral and bilateral cleft lip and palate (U/BCLP). A secondary aim was to evaluate the consistency of maxillary measurements obtained with and without general anesthesia. Material and methods. Six newborns with cleft lip and palate underwent 4 maxillary impression methods (silicone impression and 3-dimensional (3D) scan, with and without anesthesia). Intra-and inter-observer reliability was assessed by 3 clinicians using intraclass correlation coefficient, median absolute deviation, and median relative deviation (alpha=.05). Results. The intraclass correlation coefficient values for both inter-observer and intra-observer reliability indicated excellent agreement (ICC>.90, P<.05) for maxillary dimension measurements. Acceptable variability was observed because of differences in reference point identification by clinicians and across data collection methods. Conclusions. When assessing the maxilla in U/BCLP patients, both intraoral scanner and traditional impression techniques showed excellent reliability and agreement in measurements, whether performed while the newborns were awake or under general anesthesia. (J Prosthet Dent 2025;134:275-282)
[klicova_slova] => reliability; repair
[klicova_slova_orig] => reliability; repair
[url] => https://www.sciencedirect.com/science/article/pii/S0022391325001970
[oecd_obor_id] => 30200
[odpovedny_utvar_id] => 157
[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
[odpovedny_utvar_zkratka] => ISMMB
[nadrazena_soucast_id] => 4
[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
[schvalil_id] => 1770
[schvaleno] => 2025-08-01
[vykazovat_riv] => 1
[vykazovat_riv_zmeny] => 1
[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => KOŠKOVÁ, O.; BORÁK, L.; WANDA, U.; BRYŠOVÁ, A.; NOVÁKOVÁ, M.; RICHTROVA, M.; STREIT, L.; ŠTOURAČ, P.; MARCIÁN, P.
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[kod_doi] => 10.1016/j.prosdent.2025.02.054
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[zverejneno] => 1
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[znamka] =>
[kategorie_nazev] => Publication results
[druh_nazev] => WoS Article
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[stav] => Approved
[vysledek_kategorie_id] => PV
[vysledek_system_kategorie_id] => PU
[vysledek_stav_id] => 3
[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
[ins_uid] => 999999
[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISSN 0022-3913
[identifikator_popis] => ISSN - The Journal of prosthetic dentistry (US)
[riv_dodavka_id] => 3603
[riv_dodavka_oznaceni] => RIV26-MZ0-26210___
[riv_dodavka_rok] => 2026
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[citace_text] => KOŠKOVÁ, O.; BORÁK, L.; WANDA, U.; BRYŠOVÁ, A.; NOVÁKOVÁ, M.; RICHTROVA, M.; STREIT, L.; ŠTOURAČ, P.; MARCIÁN, P. Comparison of silicone impressions with intraoral 3D scans in newborns with cleft lip and palate. The Journal of prosthetic dentistry, 2025, vol. 134, no. 1, p. 275-282. ISSN: 0022-3913.
[citace_html] => KOŠKOVÁ, O.; BORÁK, L.; WANDA, U.; BRYŠOVÁ, A.; NOVÁKOVÁ, M.; RICHTROVA, M.; STREIT, L.; ŠTOURAČ, P.; MARCIÁN, P. Comparison of silicone impressions with intraoral 3D scans in newborns with cleft lip and palate. The Journal of prosthetic dentistry, 2025, vol. 134, no. 1, p. 275-282. ISSN: 0022-3913.
[citace_rtf] =>
[citace_bibtex] => @article{BUT198447,
author="Olga {Košková} and Libor {Borák} and Urbanová {Wanda} and Alena {Bryšová} and Magda {Nováková} and Michaela {Richtrova} and Libor {Streit} and Petr {Štourač} and Petr {Marcián}",
title="Comparison of silicone impressions with intraoral 3D scans in newborns with cleft lip and palate",
journal="The Journal of prosthetic dentistry",
year="2025",
volume="134",
number="1",
pages="275--282",
doi="10.1016/j.prosdent.2025.02.054",
issn="0022-3913",
url="https://www.sciencedirect.com/science/article/pii/S0022391325001970"
}
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[oecd_tree_oblast_nazev] => 3. Medical and Health Sciences
[oecd_tree_obor_id] => 30200
[oecd_tree_obor_nazev] => 3.2 Clinical medicine
[oecd_tree_podobor_id] =>
[oecd_tree_podobor_nazev] =>
[poznamka_metriky] =>
[nazev_en] => Comparison of silicone impressions with intraoral 3D scans in newborns with cleft lip and palate
[popis_en] => Statement of problem. Intraoral scanning is currently becoming the standard method for imaging the maxilla in patients with cleft lip and palate. However, the reliability of intraoral scans compared with traditional conventional impression methods has not yet been sufficiently described and examined in detail in newborns with severe types of cleft lip and palate. Purpose. The purpose of this clinical study was to assess the reliability and agreement between intraoral scanning and traditional impression methods for maxillary measurements in newborns with unilateral and bilateral cleft lip and palate (U/BCLP). A secondary aim was to evaluate the consistency of maxillary measurements obtained with and without general anesthesia. Material and methods. Six newborns with cleft lip and palate underwent 4 maxillary impression methods (silicone impression and 3-dimensional (3D) scan, with and without anesthesia). Intra-and inter-observer reliability was assessed by 3 clinicians using intraclass correlation coefficient, median absolute deviation, and median relative deviation (alpha=.05). Results. The intraclass correlation coefficient values for both inter-observer and intra-observer reliability indicated excellent agreement (ICC>.90, P<.05) for maxillary dimension measurements. Acceptable variability was observed because of differences in reference point identification by clinicians and across data collection methods. Conclusions. When assessing the maxilla in U/BCLP patients, both intraoral scanner and traditional impression techniques showed excellent reliability and agreement in measurements, whether performed while the newborns were awake or under general anesthesia. (J Prosthet Dent 2025;134:275-282)
[klicova_slova_en] => reliability; repair
[vysledek_datum] => 2025-07-27T00:00:00+02:00
)
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[nazev] => Performance of some simple ductile fracture criteria in small punch testing
[nazev_orig] => Performance of some simple ductile fracture criteria in small punch testing
[duvernost_udaju_id] => S
[popis] => Small punch testing is a well-established testing technology in situations where only tiny fragments of material are at disposal. In addition to the identification of the basic characteristics of the material, the ductility is an important output of such testing. Many existing ductile fracture models could be used for such identification, but the simplicity of the model is, in addition to its reliability, an important feature. The reason is that a limited number of experiments with the same type of specimen prevents the reliable identification of sophisticated ductile fracture models with many material parameters. That is why the work is focused on simple one-parameter criteria such as Rice and Tracey dependent on stress triaxiality, or Cockroft–Latham–Oh related to maximum principal stress, normalized by the equivalent stress. These are calibrated first by notched cylindrical specimens loaded in tension only and second by a set of broader variety of experiments under different stress states. The results of both the ductile fracture models and identification strategies with respective material constants are then applied to the numerical simulation of the small punch testing with element erosion to see their predictability of crack formation and propagation.
[popis_orig] => Small punch testing is a well-established testing technology in situations where only tiny fragments of material are at disposal. In addition to the identification of the basic characteristics of the material, the ductility is an important output of such testing. Many existing ductile fracture models could be used for such identification, but the simplicity of the model is, in addition to its reliability, an important feature. The reason is that a limited number of experiments with the same type of specimen prevents the reliable identification of sophisticated ductile fracture models with many material parameters. That is why the work is focused on simple one-parameter criteria such as Rice and Tracey dependent on stress triaxiality, or Cockroft–Latham–Oh related to maximum principal stress, normalized by the equivalent stress. These are calibrated first by notched cylindrical specimens loaded in tension only and second by a set of broader variety of experiments under different stress states. The results of both the ductile fracture models and identification strategies with respective material constants are then applied to the numerical simulation of the small punch testing with element erosion to see their predictability of crack formation and propagation.
[klicova_slova] => Ductile fracture
[klicova_slova_orig] => Ductile fracture
[url] =>
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[citace_text] => ŠEBEK, F.; KUBÍK, P.; PETRUŠKA, J. Performance of some simple ductile fracture criteria in small punch testing. In COMAT-2024. Journal of Physics: Conference Series. 2025. no. 1, p. 1-6.
[citace_html] => ŠEBEK, F.; KUBÍK, P.; PETRUŠKA, J. Performance of some simple ductile fracture criteria in small punch testing. In COMAT-2024. Journal of Physics: Conference Series. 2025. no. 1, p. 1-6.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT198467,
author="František {Šebek} and Petr {Kubík} and Jindřich {Petruška}",
title="Performance of some simple ductile fracture criteria in small punch testing",
booktitle="COMAT-2024",
year="2025",
journal="Journal of Physics: Conference Series",
volume="3035",
number="1",
pages="1--6",
doi="10.1088/1742-6596/3035/1/012001",
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[nazev_en] => Performance of some simple ductile fracture criteria in small punch testing
[popis_en] => Small punch testing is a well-established testing technology in situations where only tiny fragments of material are at disposal. In addition to the identification of the basic characteristics of the material, the ductility is an important output of such testing. Many existing ductile fracture models could be used for such identification, but the simplicity of the model is, in addition to its reliability, an important feature. The reason is that a limited number of experiments with the same type of specimen prevents the reliable identification of sophisticated ductile fracture models with many material parameters. That is why the work is focused on simple one-parameter criteria such as Rice and Tracey dependent on stress triaxiality, or Cockroft–Latham–Oh related to maximum principal stress, normalized by the equivalent stress. These are calibrated first by notched cylindrical specimens loaded in tension only and second by a set of broader variety of experiments under different stress states. The results of both the ductile fracture models and identification strategies with respective material constants are then applied to the numerical simulation of the small punch testing with element erosion to see their predictability of crack formation and propagation.
[klicova_slova_en] => Ductile fracture
[vysledek_datum] => 2025-07-07T00:00:00+02:00
)
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(
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[nazev] => Damage predictions for the 2024-T351 aluminium alloy under both monotonic and cyclic loadings
[nazev_orig] => Damage predictions for the 2024-T351 aluminium alloy under both monotonic and cyclic loadings
[duvernost_udaju_id] => S
[popis] => The failure behaviour is investigated for the 2024-T351 aluminium alloy subjected to monotonic and cyclic loading conditions using the void growth model. Notched cylindrical specimens are employed to analyse the behaviour under monotonic loading, while smooth cylindrical specimens are used for cyclic loading. The analysis encompasses a broad spectrum, ranging from the ultra-low cycle fatigue regime to the low-cycle fatigue. This comprehensive approach aims to provide a thorough understanding of fracture behaviour across a wide range of loading severities.
[popis_orig] => The failure behaviour is investigated for the 2024-T351 aluminium alloy subjected to monotonic and cyclic loading conditions using the void growth model. Notched cylindrical specimens are employed to analyse the behaviour under monotonic loading, while smooth cylindrical specimens are used for cyclic loading. The analysis encompasses a broad spectrum, ranging from the ultra-low cycle fatigue regime to the low-cycle fatigue. This comprehensive approach aims to provide a thorough understanding of fracture behaviour across a wide range of loading severities.
[klicova_slova] => Cyclic loads
[klicova_slova_orig] => Cyclic loads
[url] =>
[oecd_obor_id] => 20302
[odpovedny_utvar_id] => 157
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[citace_text] => KONDEPATI, S.; ADAMEC, T.; HASSAN, T.; ŠEBEK, F. Damage predictions for the 2024-T351 aluminium alloy under both monotonic and cyclic loadings. In COMAT-2024. Journal of Physics: Conference Series. 2025. no. 1, p. 1-6.
[citace_html] => KONDEPATI, S.; ADAMEC, T.; HASSAN, T.; ŠEBEK, F. Damage predictions for the 2024-T351 aluminium alloy under both monotonic and cyclic loadings. In COMAT-2024. Journal of Physics: Conference Series. 2025. no. 1, p. 1-6.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT198469,
author="Sudhir Kumar {Kondepati} and Tomáš {Adamec} and Tasnim {Hassan} and František {Šebek}",
title="Damage predictions for the 2024-T351 aluminium alloy under both monotonic and cyclic loadings",
booktitle="COMAT-2024",
year="2025",
journal="Journal of Physics: Conference Series",
volume="3035",
number="1",
pages="1--6",
doi="10.1088/1742-6596/3035/1/012006",
issn="1742-6588"
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[nazev_en] => Damage predictions for the 2024-T351 aluminium alloy under both monotonic and cyclic loadings
[popis_en] => The failure behaviour is investigated for the 2024-T351 aluminium alloy subjected to monotonic and cyclic loading conditions using the void growth model. Notched cylindrical specimens are employed to analyse the behaviour under monotonic loading, while smooth cylindrical specimens are used for cyclic loading. The analysis encompasses a broad spectrum, ranging from the ultra-low cycle fatigue regime to the low-cycle fatigue. This comprehensive approach aims to provide a thorough understanding of fracture behaviour across a wide range of loading severities.
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[nazev] => Analysing plate fixation of a comminuted fracture of the proximal ulna in relation to the elbow joint: a finite element study
[nazev_orig] => Analysing plate fixation of a comminuted fracture of the proximal ulna in relation to the elbow joint: a finite element study
[duvernost_udaju_id] => S
[popis] => This study investigated the biomechanical behavior of four different screw configurations used to fix comminuted proximal ulna fractures with a locking compression plate (LCP), via a detailed finite element model based on realistic anatomical geometry. The model incorporated realistic anatomical geometry including both cortical and cancellous bone, soft tissue constraints, and loading conditions representing the physiological self-weight of the forearm, with the humerus fixed at its proximal end. The stress distribution on the plate, strain intensity within the bone tissue, and interfragmentary motion (IFM) between fracture fragments were evaluated for each configuration. The results indicate that all the tested configurations provide adequate stability under normal loading conditions, with no risk of material failure. However, excessive stress concentrations were observed in specific screw regions depending on the configuration, particularly when proximal screws anchoring the olecranon (e.g. screws 2 and 3 in Variant 3) were omitted. Strain analysis revealed moderate physiological bone loading across variants, whereas IFM assessment highlighted the importance of securing the coronoid and apical fragments to prevent compromised healing. These findings suggest that a specific reductions in osteosynthetic material, such as omitting certain diaphyseal screws while maintaining crucial olecranon and coronoid fixation, may provide sufficient fracture stabilisation under the modelled conditions, potentially minimising implant-related complications. This modelling approach offers a valuable tool for preclinical assessment of osteosynthesis strategies and supports future comparative research on fixation methods with varying biomechanical properties.
[popis_orig] => This study investigated the biomechanical behavior of four different screw configurations used to fix comminuted proximal ulna fractures with a locking compression plate (LCP), via a detailed finite element model based on realistic anatomical geometry. The model incorporated realistic anatomical geometry including both cortical and cancellous bone, soft tissue constraints, and loading conditions representing the physiological self-weight of the forearm, with the humerus fixed at its proximal end. The stress distribution on the plate, strain intensity within the bone tissue, and interfragmentary motion (IFM) between fracture fragments were evaluated for each configuration. The results indicate that all the tested configurations provide adequate stability under normal loading conditions, with no risk of material failure. However, excessive stress concentrations were observed in specific screw regions depending on the configuration, particularly when proximal screws anchoring the olecranon (e.g. screws 2 and 3 in Variant 3) were omitted. Strain analysis revealed moderate physiological bone loading across variants, whereas IFM assessment highlighted the importance of securing the coronoid and apical fragments to prevent compromised healing. These findings suggest that a specific reductions in osteosynthetic material, such as omitting certain diaphyseal screws while maintaining crucial olecranon and coronoid fixation, may provide sufficient fracture stabilisation under the modelled conditions, potentially minimising implant-related complications. This modelling approach offers a valuable tool for preclinical assessment of osteosynthesis strategies and supports future comparative research on fixation methods with varying biomechanical properties.
[klicova_slova] => Proximal ulna comminuted fracture; Elbow joint; Olecranon fracture; Finite element analysis; Locking compression plate; Interfragmentary motion
[klicova_slova_orig] => Proximal ulna comminuted fracture; Elbow joint; Olecranon fracture; Finite element analysis; Locking compression plate; Interfragmentary motion
[url] => https://josr-online.biomedcentral.com/articles/10.1186/s13018-025-06031-4
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[vycet_osob] => ŠAFRAN, J.; PAVLACKÝ, T.; MARCIÁN, P.; HERŮFEK, R.; VESELÝ, R.
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[citace_text] => ŠAFRAN, J.; PAVLACKÝ, T.; MARCIÁN, P.; HERŮFEK, R.; VESELÝ, R. Analysing plate fixation of a comminuted fracture of the proximal ulna in relation to the elbow joint: a finite element study. Journal of orthopaedic surgery and research, 2025, vol. 20, no. 1, p. 1-16. ISSN: 1749-799X.
[citace_html] => ŠAFRAN, J.; PAVLACKÝ, T.; MARCIÁN, P.; HERŮFEK, R.; VESELÝ, R. Analysing plate fixation of a comminuted fracture of the proximal ulna in relation to the elbow joint: a finite element study. Journal of orthopaedic surgery and research, 2025, vol. 20, no. 1, p. 1-16. ISSN: 1749-799X.
[citace_rtf] =>
[citace_bibtex] => @article{BUT198484,
author="Jindřich {Šafran} and Tomáš {Pavlacký} and Petr {Marcián} and Radim {Herůfek} and Radek {Veselý}",
title="Analysing plate fixation of a comminuted fracture of the proximal ulna in relation to the elbow joint: a finite element study",
journal="Journal of orthopaedic surgery and research",
year="2025",
volume="20",
number="1",
pages="1--16",
doi="10.1186/s13018-025-06031-4",
url="https://josr-online.biomedcentral.com/articles/10.1186/s13018-025-06031-4"
}
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[nazev_en] => Analysing plate fixation of a comminuted fracture of the proximal ulna in relation to the elbow joint: a finite element study
[popis_en] => This study investigated the biomechanical behavior of four different screw configurations used to fix comminuted proximal ulna fractures with a locking compression plate (LCP), via a detailed finite element model based on realistic anatomical geometry. The model incorporated realistic anatomical geometry including both cortical and cancellous bone, soft tissue constraints, and loading conditions representing the physiological self-weight of the forearm, with the humerus fixed at its proximal end. The stress distribution on the plate, strain intensity within the bone tissue, and interfragmentary motion (IFM) between fracture fragments were evaluated for each configuration. The results indicate that all the tested configurations provide adequate stability under normal loading conditions, with no risk of material failure. However, excessive stress concentrations were observed in specific screw regions depending on the configuration, particularly when proximal screws anchoring the olecranon (e.g. screws 2 and 3 in Variant 3) were omitted. Strain analysis revealed moderate physiological bone loading across variants, whereas IFM assessment highlighted the importance of securing the coronoid and apical fragments to prevent compromised healing. These findings suggest that a specific reductions in osteosynthetic material, such as omitting certain diaphyseal screws while maintaining crucial olecranon and coronoid fixation, may provide sufficient fracture stabilisation under the modelled conditions, potentially minimising implant-related complications. This modelling approach offers a valuable tool for preclinical assessment of osteosynthesis strategies and supports future comparative research on fixation methods with varying biomechanical properties.
[klicova_slova_en] => Proximal ulna comminuted fracture; Elbow joint; Olecranon fracture; Finite element analysis; Locking compression plate; Interfragmentary motion
[vysledek_datum] => 2025-07-28T00:00:00+02:00
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[nazev] => Various Applications of the Digital Image Correlation Method in the Experimental Analysis of Biomechanical Problems
[nazev_orig] => Various Applications of the Digital Image Correlation Method in the Experimental Analysis of Biomechanical Problems
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[popis] => Nowadays, optical strain measurement using the digital image correlation (DIC) method is a frequently used experimental analysis method in various engineering fields. The main advantage is that it is a non-invasive method, therefore it is possible to analyze areas on structures that could be inaccessible to conventional contact methods. This paper aims to present various applications of the use of the digital image correlation method in biomechanical applications and specific case studies are presented using a commercial software Alpha from X-Sight company.
[popis_orig] => Nowadays, optical strain measurement using the digital image correlation (DIC) method is a frequently used experimental analysis method in various engineering fields. The main advantage is that it is a non-invasive method, therefore it is possible to analyze areas on structures that could be inaccessible to conventional contact methods. This paper aims to present various applications of the use of the digital image correlation method in biomechanical applications and specific case studies are presented using a commercial software Alpha from X-Sight company.
[klicova_slova] => biomechanics; digital image correlation; experimental modelling; optical measurement; strain analysis
[klicova_slova_orig] => biomechanics; digital image correlation; experimental modelling; optical measurement; strain analysis
[url] => https://www.scopus.com/pages/publications/85216517099
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[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
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[vycet_osob] => CABAJ, G.; NÁVRAT, T.; BOHÁČ, P.; VOSYNEK, P.; APOSTOLOPOULOS, V.; KUNZ, L.; BENEŠ, J.
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[identifikator] => ISBN 9788026112259
[identifikator_popis] => ISBN - EAN 2024 - 62nd International Conference on Experimental Stress Analysis, Book of Extended Abstracts
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[citace_text] => CABAJ, G.; NÁVRAT, T.; BOHÁČ, P.; VOSYNEK, P.; APOSTOLOPOULOS, V.; KUNZ, L.; BENEŠ, J. Various Applications of the Digital Image Correlation Method in the Experimental Analysis of Biomechanical Problems. In EAN 2024 - 62nd International Conference on Experimental Stress Analysis, Book of Extended Abstracts. Bozi Dar: University of West Bohemia in Pilsen, 2024. 6 p. ISBN: 9788026112259.
[citace_html] => CABAJ, G.; NÁVRAT, T.; BOHÁČ, P.; VOSYNEK, P.; APOSTOLOPOULOS, V.; KUNZ, L.; BENEŠ, J. Various Applications of the Digital Image Correlation Method in the Experimental Analysis of Biomechanical Problems. In EAN 2024 - 62nd International Conference on Experimental Stress Analysis, Book of Extended Abstracts. Bozi Dar: University of West Bohemia in Pilsen, 2024. 6 p. ISBN: 9788026112259.
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[citace_bibtex] => @inproceedings{BUT198569,
author="Gabriel {Cabaj} and Tomáš {Návrat} and Petr {Boháč} and Petr {Vosynek} and Vasileios {Apostolopoulos} and Ludvík {Kunz} and Jan {Beneš}",
title="Various Applications of the Digital Image Correlation Method in the Experimental Analysis of Biomechanical Problems",
booktitle="EAN 2024 - 62nd International Conference on Experimental Stress Analysis, Book of Extended Abstracts",
year="2024",
pages="6",
publisher="University of West Bohemia in Pilsen",
address="Bozi Dar",
isbn="9788026112259",
url="https://www.scopus.com/pages/publications/85216517099"
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[klicova_slova_en] => biomechanics; digital image correlation; experimental modelling; optical measurement; strain analysis
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