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[popis] => This contribution investigates the impact of variable amplitude loading on crack growth rates, highlighting the phenomena of retardation and acceleration in material behaviour. Variable loading conditions, characterised by differing magnitudes and sequences, can significantly influence crack growth, either slowing down or speeding up compared to constant loading. Through the study of compact tension specimens under two consecutive loading blocks at a constant load ratio (R=0.1), using a strip-yield model. The findings emphasise the importance of accurately modelling these dynamics for ensuring structural reliability and safety under variable loading conditions, offering valuable insights for materials engineering and structural integrity.
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[citace_text] => KUBÍČEK, R.; VOJTEK, T.; POKORNÝ, P.; NÁHLÍK, L.; HUTAŘ, P. Crack closure development following amplitude changes. APPLIED MECHANICS 2024 - Book of Articles. Žilina: University of Žilina, 2024. p. 94-97. ISBN: 978-80-554-2090-5.
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author="Radek {Kubíček} and Tomáš {Vojtek} and Pavel {Pokorný} and Luboš {Náhlík} and Pavel {Hutař}",
title="Crack closure development following amplitude changes",
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year="2024",
pages="94--97",
publisher="University of Žilina",
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title="Paradox of Shorter Residual Fatigue Life due to Omission of Low-Amplitude Cycles and Its Significance for Testing",
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title="Key Issues With Residual Fatigue Life Estimation In Steels, Highly Scattered And Non-Conservative Thresholds, Crack Closure Mechanisms, Influencing Factors, Relevant Material Properties",
booktitle="FATIGUE 2024: Proceedings of the 9th Engineering Integrity Society International Conference on Durability & Fatigue",
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[popis_en] => Fatigue crack growth rates for three different steels at room temperature were measured at high and low load ratios. The loading components and mechanisms in terms of effective ΔK, plasticity-, roughness- and oxide-induced crack closure were separated, including the threshold. The plasticity-induced crack closure values were modified according to the material cyclic plastic behaviour. The influencing factors on oxide debris growth such as loading history and air humidity are discussed. A model for simulation of oxide debris growth is introduced. The approach to fatigue crack growth modelling considering all these effects is presented, which contributes to a clarification of the influencing factors and to reaching the aim of transferability of the fatigue crack growth data into applications. It is pointed out that the lack of consideration of oxide-induced crack closure can lead to several non-conservative or misleading scenarios.
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[vysledek_datum] => 2024-06-19T00:00:00+02:00
)
[3] => Array
(
[vysledek_id] => 197035
[vysledek_druh_id] => CONPA
[ex_vysledek_id] => 155776
[vysledek_rok] => 2024
[nazev] => Finite element analysis of nanoindentation pile-up and correction of projected contact area
[nazev_orig] => Finite element analysis of nanoindentation pile-up and correction of projected contact area
[duvernost_udaju_id] => S
[popis] => This paper deals with the pile-up phenomenon that can occur during nanoindentation. Finite Element (FE) simulation of X5CrNiCuNb16-4 steel nanoindentation with pyramidal Berkovich indenter was done, and stress and strain beneath the indenter leading to pile-up behavior were analyzed in detail. Pile-up also influences the projected contact area, which should be corrected to include the pile-up into the Oliver-Pharr analysis. Accurate calculation of the projected contact area requires knowledge of its boundary. Few methods of boundary approximation were used, including approximation by the triangle and the semi-ellipse. For more precise approximation, the expression for parabolical approximation was derived. These methods were compared with the projected contact area calculated by finite element method. The most precise results were obtained using semi-elliptical and parabolical correction, which can be used for the determination of the projected contact area and its boundary.
[popis_orig] => This paper deals with the pile-up phenomenon that can occur during nanoindentation. Finite Element (FE) simulation of X5CrNiCuNb16-4 steel nanoindentation with pyramidal Berkovich indenter was done, and stress and strain beneath the indenter leading to pile-up behavior were analyzed in detail. Pile-up also influences the projected contact area, which should be corrected to include the pile-up into the Oliver-Pharr analysis. Accurate calculation of the projected contact area requires knowledge of its boundary. Few methods of boundary approximation were used, including approximation by the triangle and the semi-ellipse. For more precise approximation, the expression for parabolical approximation was derived. These methods were compared with the projected contact area calculated by finite element method. The most precise results were obtained using semi-elliptical and parabolical correction, which can be used for the determination of the projected contact area and its boundary.
[klicova_slova] => nanoindentation, Berkovich indenter, pile-up, parabolical correction, steel, finite element method
[klicova_slova_orig] => nanoindentation, Berkovich indenter, pile-up, parabolical correction, steel, finite element method
[url] => https://ojs.cvut.cz/ojs/index.php/APP/article/view/10356
[oecd_obor_id] => 20302
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[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
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[nadrazena_soucast_id] => 4
[nadrazena_soucast_zkratka] => FME
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[vycet_osob] => KOVÁŘ, J.; FUIS, V.; ČTVRTLÍK, R.; TOMÁŠTÍK, J.
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[kod_doi] => 10.14311/APP.2024.50.0018
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[druh_popis] => Paper in proceedings (conference paper)
[stav] => Approved
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[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
[ins_uid] => 999999
[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
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[identifikator] => ISBN 9788001073865
[identifikator_popis] => ISBN - Acta Polytechnica CTU Proceedings
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[citace_text] => KOVÁŘ, J.; FUIS, V.; ČTVRTLÍK, R.; TOMÁŠTÍK, J. Finite element analysis of nanoindentation pile-up and correction of projected contact area. In Acta Polytechnica CTU Proceedings. Acta Polytechnica CTU Proceedings. Praha: Czech Technical University in Prague, 2024. p. 18-23. ISBN: 9788001073865. ISSN: 2336-5382.
[citace_html] => KOVÁŘ, J.; FUIS, V.; ČTVRTLÍK, R.; TOMÁŠTÍK, J. Finite element analysis of nanoindentation pile-up and correction of projected contact area. In Acta Polytechnica CTU Proceedings. Acta Polytechnica CTU Proceedings. Praha: Czech Technical University in Prague, 2024. p. 18-23. ISBN: 9788001073865. ISSN: 2336-5382.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT197035,
author="Jaroslav {Kovář} and Vladimír {Fuis} and Radim {Čtvrtlík} and Jan {Tomáštík}",
title="Finite element analysis of nanoindentation pile-up and correction of projected contact area",
booktitle="Acta Polytechnica CTU Proceedings",
year="2024",
journal="Acta Polytechnica CTU Proceedings",
volume="50",
number="50",
pages="18--23",
publisher="Czech Technical University in Prague",
address="Praha",
doi="10.14311/APP.2024.50.0018",
isbn="9788001073865",
url="https://ojs.cvut.cz/ojs/index.php/APP/article/view/10356"
}
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[nazev_en] => Finite element analysis of nanoindentation pile-up and correction of projected contact area
[popis_en] => This paper deals with the pile-up phenomenon that can occur during nanoindentation. Finite Element (FE) simulation of X5CrNiCuNb16-4 steel nanoindentation with pyramidal Berkovich indenter was done, and stress and strain beneath the indenter leading to pile-up behavior were analyzed in detail. Pile-up also influences the projected contact area, which should be corrected to include the pile-up into the Oliver-Pharr analysis. Accurate calculation of the projected contact area requires knowledge of its boundary. Few methods of boundary approximation were used, including approximation by the triangle and the semi-ellipse. For more precise approximation, the expression for parabolical approximation was derived. These methods were compared with the projected contact area calculated by finite element method. The most precise results were obtained using semi-elliptical and parabolical correction, which can be used for the determination of the projected contact area and its boundary.
[klicova_slova_en] => nanoindentation, Berkovich indenter, pile-up, parabolical correction, steel, finite element method
[vysledek_datum] => 2024-12-17T00:00:00+01:00
)
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(
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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
[duvernost_udaju_id] => S
[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
[oecd_obor_id] => 20601
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[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] => 2025-02-27
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[posledni_diagnostika] =>
[vycet_osob] => VAVERKA, J.; BURŠA, J.
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[poznamka] =>
[typ_nazev] =>
[kod_doi] => 10.1016/j.euromechsol.2025.105586
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[identifikator_popis] => ISSN - European journal of mechanics, A, Solids (FR)
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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.
[citace_html] => 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.
[citace_rtf] =>
[citace_bibtex] => @article{BUT197165,
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",
volume="111",
number="MAY-JUN",
pages="11",
doi="10.1016/j.euromechsol.2025.105586",
issn="0997-7538",
url="https://www.sciencedirect.com/science/article/pii/S0997753825000208"
}
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[nazev_en] => A modification of Holzapfel-Ogden hyperelastic model of myocardium better describing its passive mechanical behavior
[popis_en] => 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_en] => Cardiac mechanics; Myocardium; Hyperelasticity; Constitutive model; Orthotropy
[vysledek_datum] => 2025-02-21T00:00:00+01:00
)
[5] => Array
(
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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
[oecd_obor_id] => 20301
[odpovedny_utvar_id] => 157
[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
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[schvaleno] => 2025-09-03
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[vycet_osob] => POKORNÝ, J.; NÁVRAT, T.; VAJDÁK, M.; CABAJ, G.; SLIWKOVÁ, P.
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[poznamka] =>
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[kod_doi] => 10.1016/j.wear.2025.205876
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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",
url="https://www.sciencedirect.com/science/article/pii/S0043164825001450"
}
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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
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[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.
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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.
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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
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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
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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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[ins_ts] => 2025-09-22
[upd_ts] => 2026-02-18
[status] => 9
[identifikator] => ISSN 2662-4745
[identifikator_popis] => ISSN - Railway Engineering Science (CN)
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[riv_dodavka_oznaceni] => RIV26-MSM-26210___
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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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[oecd_tree_oblast_nazev] => 2. Engineering and Technology
[oecd_tree_obor_id] => 20100
[oecd_tree_obor_nazev] => 2.1 Civil engineering
[oecd_tree_podobor_id] => 20104
[oecd_tree_podobor_nazev] => Transport engineering
[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
)
[9] => Array
(
[vysledek_id] => 197520
[vysledek_druh_id] => ARTWOS
[ex_vysledek_id] => 156191
[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
[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] => 2025-04-14
[vykazovat_riv] => 1
[vykazovat_riv_zmeny] => 1
[slozka_id] =>
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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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[zverejneno] => 1
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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
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[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
[ins_uid] => 999999
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[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[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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[oecd_tree_obor_id] => 10700
[oecd_tree_obor_nazev] => 1.7 Other natural sciences
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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
)
[10] => Array
(
[vysledek_id] => 197626
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[nazev] => Layer-specific residual strains in human carotid arteries revealed under layer separation
[nazev_orig] => Layer-specific residual strains in human carotid arteries revealed under layer separation
[duvernost_udaju_id] => S
[popis] => Residual stresses are considered as a significant factor influencing the stress-states in arteries. These stresses are typically observed through opening angle of a radially cut artery segment, often regarded as a primary descriptor of their stress-free state. However, the experimental evidence regarding the stress-free states of different artery layers is scarce. In this study, two experimental protocols, each employing different layer-separating sequences, were performed on 17 human common carotid arteries; the differences between both protocols were found statistically insignificant. While the media exhibited opening behaviour (reduced curvature), a contrasting trend was observed for the adventitia curvature, indicating its closing behaviour. In addition to the different bending effect, length changes of both layers after separation were observed, namely shortening of the adventitia and elongation of the media. The results point out that not all the residual stresses are released after a radial cut but a significant portion of them is released only after the layer separation. Considering the different mechanical properties of layers, this may significantly change the stress distribution in arterial wall and should be considered in its biomechanical models.
[popis_orig] => Residual stresses are considered as a significant factor influencing the stress-states in arteries. These stresses are typically observed through opening angle of a radially cut artery segment, often regarded as a primary descriptor of their stress-free state. However, the experimental evidence regarding the stress-free states of different artery layers is scarce. In this study, two experimental protocols, each employing different layer-separating sequences, were performed on 17 human common carotid arteries; the differences between both protocols were found statistically insignificant. While the media exhibited opening behaviour (reduced curvature), a contrasting trend was observed for the adventitia curvature, indicating its closing behaviour. In addition to the different bending effect, length changes of both layers after separation were observed, namely shortening of the adventitia and elongation of the media. The results point out that not all the residual stresses are released after a radial cut but a significant portion of them is released only after the layer separation. Considering the different mechanical properties of layers, this may significantly change the stress distribution in arterial wall and should be considered in its biomechanical models.
[klicova_slova] => Common carotid artery; layer specific residual deformation; vascular heterogeneity
[klicova_slova_orig] => Common carotid artery; layer specific residual deformation; vascular heterogeneity
[url] => https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0308434
[oecd_obor_id] => 10700
[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] => 2025-06-03
[vykazovat_riv] => 1
[vykazovat_riv_zmeny] => 1
[slozka_id] => 165095
[posledni_diagnostika] =>
[vycet_osob] => HRUBANOVÁ, A.; LISICKÝ, O.; SOCHOR, O.; BEDNAŘÍK, Z.; JOUKAL, M.; BURŠA, J.
[pocet_tvurcu] => 6
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[kod_doi] => 10.1371/journal.pone.0308434
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[zverejneno] => 1
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[korespondencni_autor] =>
[posledni_autor] =>
[znamka] =>
[kategorie_nazev] => Publication results
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[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
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[riv_dodavka_oznaceni] => RIV26-GA0-26210___
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[citace_text] => HRUBANOVÁ, A.; LISICKÝ, O.; SOCHOR, O.; BEDNAŘÍK, Z.; JOUKAL, M.; BURŠA, J. Layer-specific residual strains in human carotid arteries revealed under layer separation. PLoS One, 2025, vol. 20, no. 4, p. 1-17. ISSN: 1932-6203.
[citace_html] => HRUBANOVÁ, A.; LISICKÝ, O.; SOCHOR, O.; BEDNAŘÍK, Z.; JOUKAL, M.; BURŠA, J. Layer-specific residual strains in human carotid arteries revealed under layer separation. PLoS One, 2025, vol. 20, no. 4, p. 1-17. ISSN: 1932-6203.
[citace_rtf] =>
[citace_bibtex] => @article{BUT197626,
author="Anna {Hrubanová} and Ondřej {Lisický} and Ondřej {Sochor} and Zdeněk {Bednařík} and Marek {Joukal} and Jiří {Burša}",
title="Layer-specific residual strains in human carotid arteries revealed under layer separation",
journal="PLoS One",
year="2025",
volume="20",
number="4",
pages="1--17",
doi="10.1371/journal.pone.0308434",
issn="1932-6203",
url="https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0308434"
}
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[poznamka_metriky] =>
[nazev_en] => Layer-specific residual strains in human carotid arteries revealed under layer separation
[popis_en] => Residual stresses are considered as a significant factor influencing the stress-states in arteries. These stresses are typically observed through opening angle of a radially cut artery segment, often regarded as a primary descriptor of their stress-free state. However, the experimental evidence regarding the stress-free states of different artery layers is scarce. In this study, two experimental protocols, each employing different layer-separating sequences, were performed on 17 human common carotid arteries; the differences between both protocols were found statistically insignificant. While the media exhibited opening behaviour (reduced curvature), a contrasting trend was observed for the adventitia curvature, indicating its closing behaviour. In addition to the different bending effect, length changes of both layers after separation were observed, namely shortening of the adventitia and elongation of the media. The results point out that not all the residual stresses are released after a radial cut but a significant portion of them is released only after the layer separation. Considering the different mechanical properties of layers, this may significantly change the stress distribution in arterial wall and should be considered in its biomechanical models.
[klicova_slova_en] => Common carotid artery; layer specific residual deformation; vascular heterogeneity
[vysledek_datum] => 2025-04-07T00:00:00+02:00
)
[11] => Array
(
[vysledek_id] => 197698
[vysledek_druh_id] => ARTWOS
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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
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[originalni_jazyk] => en
[schvalil_id] => 2810
[schvaleno] => 2025-04-15
[vykazovat_riv] => 1
[vykazovat_riv_zmeny] => 1
[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => ŠEBEK, F.; KUBÍK, P.; ZAPLETAL, J.; KUNČICKÁ, L.; KOCICH, R.; PAGÁČ, M.; PAŠKA, Z.; FOJTÍK, F.; HALAMA, R.
[pocet_tvurcu] => 9
[tvurci_ids] =>
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[kod_doi] => 10.1007/s00170-025-15387-0
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[zverejneno] => 1
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[kategorie_nazev] => Publication results
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[druh_popis] => Peer-reviewed article included in Web of Science database as as an “Article”, “Review” or “Letter”
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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
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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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[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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[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] => 51108
[schvaleno] => 2025-08-06
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[slozka_id] => 170345
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[vycet_osob] => ADAMEC, T.; HASSAN, T.; ZAPLETAL, J.; KONDEPATI, S.; ŠEBEK, F.
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[kod_doi] => 10.1016/j.euromechsol.2025.105770
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[stav] => Approved
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[ins_ts] => 2025-09-22
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[status] => 9
[identifikator] => ISSN 0997-7538
[identifikator_popis] => ISSN - European journal of mechanics, A, Solids (FR)
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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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[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
)
[13] => Array
(
[vysledek_id] => 198446
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[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
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[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] => 2025-09-09
[vykazovat_riv] => 1
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[vycet_osob] => MARTÍNEK, L.; BOHÁČ, P.; APOSTOLOPOULOS, V.; NÁVRAT, T.; LANGER, R.; NACHTNEBL, L.; TOMÁŠ, T.
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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
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[title] => Crack closure development following amplitude changes
[typ] => PV
[year] => 2024
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[title] => Paradox of Shorter Residual Fatigue Life due to Omission of Low-Amplitude Cycles and Its Significance for Testing
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[year] => 2025
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[quotations] => VOJTEK, T.; KUBÍČEK, R.; POKORNÝ, P.; JAMBOR, M.; NÁHLÍK, L.; HUTAŘ, P.
[title] => Key Issues With Residual Fatigue Life Estimation In Steels, Highly Scattered And Non-Conservative Thresholds, Crack Closure Mechanisms, Influencing Factors, Relevant Material Properties
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[year] => 2024
[id_vav] => 197004
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[quotations] => KOVÁŘ, J.; FUIS, V.; ČTVRTLÍK, R.; TOMÁŠTÍK, J.
[title] => Finite element analysis of nanoindentation pile-up and correction of projected contact area
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[year] => 2024
[id_vav] => 197035
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[title] => A modification of Holzapfel-Ogden hyperelastic model of myocardium better describing its passive mechanical behavior
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[year] => 2025
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[title] => Dynamic performance and wear of ceramic aerodynamic tilting-pad journal bearings: Tested and simulated under excessive vibrations
[typ] => PV
[year] => 2025
[id_vav] => 197187
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[quotations] => VLACH, R.; KRAML, A.; HUZLÍK, R.; BÁRTA, J.; MACH, M.; GREPL, R.; LOŠÁK, P.; ŘEDINA, J.; BERNARD, I.
[title] => Synchronní dynamometr PMM450/5.3-25.
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[year] => 2024
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[year] => 2026
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[title] => Computational modeling of bone allograft reconstruction following femoral shaft tumor resection: Investigating the impact of supplementary plate fixation
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[year] => 2025
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[title] => Plasticity and ductile fracture of conventionally manufactured AISI 316L compared to one produced by selective laser melting with and without machining
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[year] => 2025
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[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
[typ] => PV
[year] => 2025
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