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[vysledek_id] => 201003
[vysledek_druh_id] => ABSTR
[ex_vysledek_id] =>
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[vysledek_rok] =>
[nazev] => Simulations, Design and Experimental Validation of a High-Speed
Electrically Powered Rocket Oxidizer Pump
[nazev_orig] => Simulations, Design and Experimental Validation of a High-Speed
Electrically Powered Rocket Oxidizer Pump
[duvernost_udaju_id] => S
[popis] => Seal‑less e‑powered (canned‑motor) centrifugal pumps are attractive for rocket propellants, in
this case liquid‑oxygen (LOX) transfer because they eliminate dynamic seals and potential leakage
paths, but they impose tightly coupled constraints across hydraulics, rotordynamics,
electromagnetics and thermal management. This contribution reports a design and validation
methodology for a high‑speed pump targeted at LOX, together with lessons learned from an
instrumented water‑surrogate test campaign.
[popis_orig] => Seal‑less e‑powered (canned‑motor) centrifugal pumps are attractive for rocket propellants, in
this case liquid‑oxygen (LOX) transfer because they eliminate dynamic seals and potential leakage
paths, but they impose tightly coupled constraints across hydraulics, rotordynamics,
electromagnetics and thermal management. This contribution reports a design and validation
methodology for a high‑speed pump targeted at LOX, together with lessons learned from an
instrumented water‑surrogate test campaign.
[klicova_slova] => Cryogenic Centrifugal Pump; Liquid Oxygen (LOX); Hydrodynamic Bearings;
PMSM drive
[klicova_slova_orig] => Cryogenic Centrifugal Pump; Liquid Oxygen (LOX); Hydrodynamic Bearings;
PMSM drive
[url] =>
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[vycet_osob] => PAVLÍK, O.; NÁVRAT, T.
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[vlozil] => Pavlík Ondřej
[upravil] => Petruška Jindřich
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[citace_text] => PAVLÍK, O.; NÁVRAT, T. Simulations, Design and Experimental Validation of a High-Speed Electrically Powered Rocket Oxidizer Pump.
[citace_html] => PAVLÍK, O.; NÁVRAT, T. Simulations, Design and Experimental Validation of a High-Speed Electrically Powered Rocket Oxidizer Pump.
[citace_rtf] =>
[citace_bibtex] => @misc{BUT201003,
author="Ondřej {Pavlík} and Tomáš {Návrat}",
title="Simulations, Design and Experimental Validation of a High-Speed
Electrically Powered Rocket Oxidizer Pump",
note="Abstract"
}
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[poznamka_metriky] =>
[nazev_en] => Simulations, Design and Experimental Validation of a High-Speed
Electrically Powered Rocket Oxidizer Pump
[popis_en] => Seal‑less e‑powered (canned‑motor) centrifugal pumps are attractive for rocket propellants, in
this case liquid‑oxygen (LOX) transfer because they eliminate dynamic seals and potential leakage
paths, but they impose tightly coupled constraints across hydraulics, rotordynamics,
electromagnetics and thermal management. This contribution reports a design and validation
methodology for a high‑speed pump targeted at LOX, together with lessons learned from an
instrumented water‑surrogate test campaign.
[klicova_slova_en] => Cryogenic Centrifugal Pump; Liquid Oxygen (LOX); Hydrodynamic Bearings;
PMSM drive
)
[1] => Array
(
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[nazev] => Measured and Calculated Stiffness and Damping Coefficients of Water-Lubricated Tilting-Pad Journal Bearing
[nazev_orig] => Measured and Calculated Stiffness and Damping Coefficients of Water-Lubricated Tilting-Pad Journal Bearing
[duvernost_udaju_id] => S
[popis] => This paper deals with the measurement and computational modelling of the dynamic performance of a hydrodynamic water-lubricated tilting-pad journal bearing. The measurement is performed on a developed test rig, which contains a special bearing housing with integrated piezo-actuators enabling dynamic excitation of the bearing. A reported computational model is based on the generalized dynamic Reynolds equation coupled with the 2D energy equation in the bearing midplane. This model involves the lubricant mixing, deformation and tilting of the pads, and establishing the static equilibrium position of the bearing. Results of the dynamic performance dependent on rotational speed are given for a particular water-lubricated journal bearing. These results are compared with the measured data.
[popis_orig] => This paper deals with the measurement and computational modelling of the dynamic performance of a hydrodynamic water-lubricated tilting-pad journal bearing. The measurement is performed on a developed test rig, which contains a special bearing housing with integrated piezo-actuators enabling dynamic excitation of the bearing. A reported computational model is based on the generalized dynamic Reynolds equation coupled with the 2D energy equation in the bearing midplane. This model involves the lubricant mixing, deformation and tilting of the pads, and establishing the static equilibrium position of the bearing. Results of the dynamic performance dependent on rotational speed are given for a particular water-lubricated journal bearing. These results are compared with the measured data.
[klicova_slova] => Damping; Measurement; Numerical analysis; Stiffness; Tilting pad journal bearing
[klicova_slova_orig] => Damping; Measurement; Numerical analysis; Stiffness; Tilting pad journal bearing
[url] => http://experimentalni-mechanika.cz/cs/konference/konference/2022/file/3038-1466_prispevek.html
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[slozka_id] => 184915
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[vycet_osob] => POKORNÝ, J.; NÁVRAT, T.; VAJDÁK, M.
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[vysledek_kategorie_id] => PV
[vysledek_system_kategorie_id] => PU
[vysledek_stav_id] => 3
[vlozil] => Pokorný Jan
[upravil] => Petruška Jindřich
[ins_uid] => 160824
[upd_uid] => 1770
[ins_ts] => 2026-02-09
[upd_ts] => 2026-02-09
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[identifikator] => ISBN 9788001074008
[identifikator_popis] => ISBN - EAN 2022 - Proceedings of the 60th Annual Conference on Experimental Stress Analysis
[riv_dodavka_id] => 3571
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[citace_text] => POKORNÝ, J.; NÁVRAT, T.; VAJDÁK, M. Measured and Calculated Stiffness and Damping Coefficients of Water-Lubricated Tilting-Pad Journal Bearing. In EAN 2022 - Proceedings of the 60th Annual Conference on Experimental Stress Analysis. Prague: Czech Technical University, 2022. p. 309-317. ISBN: 9788001074008.
[citace_html] => POKORNÝ, J.; NÁVRAT, T.; VAJDÁK, M. Measured and Calculated Stiffness and Damping Coefficients of Water-Lubricated Tilting-Pad Journal Bearing. In EAN 2022 - Proceedings of the 60th Annual Conference on Experimental Stress Analysis. Prague: Czech Technical University, 2022. p. 309-317. ISBN: 9788001074008.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT201087,
author="Jan {Pokorný} and Tomáš {Návrat} and Michal {Vajdák}",
title="Measured and Calculated Stiffness and Damping Coefficients of Water-Lubricated Tilting-Pad Journal Bearing",
booktitle="EAN 2022 - Proceedings of the 60th Annual Conference on Experimental Stress Analysis",
year="2022",
pages="309--317",
publisher="Czech Technical University",
address="Prague",
isbn="9788001074008",
url="http://experimentalni-mechanika.cz/cs/konference/konference/2022/file/3038-1466_prispevek.html"
}
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[poznamka_metriky] =>
[nazev_en] => Measured and Calculated Stiffness and Damping Coefficients of Water-Lubricated Tilting-Pad Journal Bearing
[popis_en] => This paper deals with the measurement and computational modelling of the dynamic performance of a hydrodynamic water-lubricated tilting-pad journal bearing. The measurement is performed on a developed test rig, which contains a special bearing housing with integrated piezo-actuators enabling dynamic excitation of the bearing. A reported computational model is based on the generalized dynamic Reynolds equation coupled with the 2D energy equation in the bearing midplane. This model involves the lubricant mixing, deformation and tilting of the pads, and establishing the static equilibrium position of the bearing. Results of the dynamic performance dependent on rotational speed are given for a particular water-lubricated journal bearing. These results are compared with the measured data.
[klicova_slova_en] => Damping; Measurement; Numerical analysis; Stiffness; Tilting pad journal bearing
[vysledek_datum] => 2022-06-06T00:00:00+02:00
)
[2] => Array
(
[vysledek_id] => 201403
[vysledek_druh_id] => CONPA
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[nazev] => Experimental investigation of silicone impression materials
[nazev_orig] => Experimental investigation of silicone impression materials
[duvernost_udaju_id] =>
[popis] => Silicone impression materials are widely used in orthodontic practice for dental impressions, but they can be used in different applications. One potential application is the use of protective obturators during anaesthesia prior to cleft palate surgery. These silicone materials come from various brands with different material properties, which can influence the final product. Thus, these different mechanical properties were examined experimentally. Tensile tests were performed on specimens prepared with the use of 3D printed moulds and their structure was investigated by micro-CT.
[popis_orig] => Silicone impression materials are widely used in orthodontic practice for dental impressions, but they can be used in different applications. One potential application is the use of protective obturators during anaesthesia prior to cleft palate surgery. These silicone materials come from various brands with different material properties, which can influence the final product. Thus, these different mechanical properties were examined experimentally. Tensile tests were performed on specimens prepared with the use of 3D printed moulds and their structure was investigated by micro-CT.
[klicova_slova] => micro-CT | Silicone materials | tensile testing
[klicova_slova_orig] => micro-CT | Silicone materials | tensile testing
[url] => https://www.sciencedirect.com/science/article/pii/S2452321625005256
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[vycet_osob] => HRUBANOVÁ, A.; THOMKOVÁ, B.; BORÁK, L.; KOŠKOVÁ, O.; RICHTROVA, M.; MARCIÁN, P.
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[citace_text] => HRUBANOVÁ, A.; THOMKOVÁ, B.; BORÁK, L.; KOŠKOVÁ, O.; RICHTROVA, M.; MARCIÁN, P. Experimental investigation of silicone impression materials. In Procedia Structural Integrity. Procedia Structural Integrity. Elsevier B.V., 2025. no. 1, p. 33-37.
[citace_html] => HRUBANOVÁ, A.; THOMKOVÁ, B.; BORÁK, L.; KOŠKOVÁ, O.; RICHTROVA, M.; MARCIÁN, P. Experimental investigation of silicone impression materials. In Procedia Structural Integrity. Procedia Structural Integrity. Elsevier B.V., 2025. no. 1, p. 33-37.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT201403,
author="{} and Anna {Hrubanová} and {} and Barbora {Thomková} and {} and Libor {Borák} and {} and Olga {Košková} and {} and Michaela {Richtrova} and {} and Petr {Marcián}",
title="Experimental investigation of silicone impression materials",
booktitle="Procedia Structural Integrity",
year="2025",
journal="Procedia Structural Integrity",
volume="74",
number="1",
pages="33--37",
publisher="Elsevier B.V.",
doi="10.1016/j.prostr.2025.10.030",
url="https://www.sciencedirect.com/science/article/pii/S2452321625005256"
}
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[nazev_en] => Experimental investigation of silicone impression materials
[popis_en] => Silicone impression materials are widely used in orthodontic practice for dental impressions, but they can be used in different applications. One potential application is the use of protective obturators during anaesthesia prior to cleft palate surgery. These silicone materials come from various brands with different material properties, which can influence the final product. Thus, these different mechanical properties were examined experimentally. Tensile tests were performed on specimens prepared with the use of 3D printed moulds and their structure was investigated by micro-CT.
[klicova_slova_en] => micro-CT | Silicone materials | tensile testing
[vysledek_datum] => 2025-12-08T00:00:00+01:00
)
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(
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[nazev] => Influence of initial misfit strains on small scale domain switching ahead of interface crack between piezoelectric layer and dielectric isotropic substrate
[nazev_orig] => Influence of initial misfit strains on small scale domain switching ahead of interface crack between piezoelectric layer and dielectric isotropic substrate
[duvernost_udaju_id] => S
[popis] => his study derives the effect of discontinuous initial strain distributions on the small-scale domain switching ahead of the bi-material notch formed between a piezoelectric layer and dielectric isotropic substrate. As a piezoelectric layer the piezoelectric ceramics PZT-5H grown on the elastic substrate formed by amorphous silicon dioxide (SiO 2) is considered. The energetic switching principle and micromechanical domain switching framework proposed by Hwang et al. (1995) is applied. The initial thermal misfit constant strain is included in the constitutive relations. The analysis of the asymptotic in-plane field of the bi-material notch is conducted utilizing the extended Lekhnitskii-Eshelby-Stroh formalism. The asymptotic in-plane field is used to predict the domain switching zone applying the energy-based criterion. The influence of the thermal misfit strain on the size and shape of the switching zone in the piezoelectric layer is computed for various initial poling directions.
[popis_orig] => his study derives the effect of discontinuous initial strain distributions on the small-scale domain switching ahead of the bi-material notch formed between a piezoelectric layer and dielectric isotropic substrate. As a piezoelectric layer the piezoelectric ceramics PZT-5H grown on the elastic substrate formed by amorphous silicon dioxide (SiO 2) is considered. The energetic switching principle and micromechanical domain switching framework proposed by Hwang et al. (1995) is applied. The initial thermal misfit constant strain is included in the constitutive relations. The analysis of the asymptotic in-plane field of the bi-material notch is conducted utilizing the extended Lekhnitskii-Eshelby-Stroh formalism. The asymptotic in-plane field is used to predict the domain switching zone applying the energy-based criterion. The influence of the thermal misfit strain on the size and shape of the switching zone in the piezoelectric layer is computed for various initial poling directions.
[klicova_slova] => Small-scale domain switching; Piezoelectric interface crack; Expanded LES formalism; Two-state H-integral
[klicova_slova_orig] => Small-scale domain switching; Piezoelectric interface crack; Expanded LES formalism; Two-state H-integral
[url] => https://www.sciencedirect.com/science/article/pii/S2452321626001514
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[odpovedny_utvar_nazev] => Ústav mechaniky těles, mechatroniky a biomechaniky
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[originalni_jazyk] => en
[schvalil_id] => 1770
[schvaleno] => 2026-02-20
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[citace_text] => Hrstka, Kotoul, Profant, Aliabadi. Influence of initial misfit strains on small scale domain switching ahead of interface crack between piezoelectric layer and dielectric isotropic substrate. Procedia Structural Integrity. Elsevier BV, 2026. p. 471-492.
[citace_html] => Hrstka, Kotoul, Profant, Aliabadi. Influence of initial misfit strains on small scale domain switching ahead of interface crack between piezoelectric layer and dielectric isotropic substrate. Procedia Structural Integrity. Elsevier BV, 2026. p. 471-492.
[citace_rtf] =>
[citace_bibtex] => @misc{BUT201455,
author="Miroslav {Hrstka} and Michal {Kotoul} and Tomáš {Profant} and {}",
title="Influence of initial misfit strains on small scale domain switching ahead of interface crack between piezoelectric layer and dielectric isotropic substrate",
year="2026",
journal="Procedia Structural Integrity",
volume="80",
pages="471--492",
publisher="Elsevier BV",
doi="10.1016/j.prostr.2026.02.046",
url="https://www.sciencedirect.com/science/article/pii/S2452321626001514",
note="Article - other"
}
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[nazev_en] => Influence of initial misfit strains on small scale domain switching ahead of interface crack between piezoelectric layer and dielectric isotropic substrate
[popis_en] => his study derives the effect of discontinuous initial strain distributions on the small-scale domain switching ahead of the bi-material notch formed between a piezoelectric layer and dielectric isotropic substrate. As a piezoelectric layer the piezoelectric ceramics PZT-5H grown on the elastic substrate formed by amorphous silicon dioxide (SiO 2) is considered. The energetic switching principle and micromechanical domain switching framework proposed by Hwang et al. (1995) is applied. The initial thermal misfit constant strain is included in the constitutive relations. The analysis of the asymptotic in-plane field of the bi-material notch is conducted utilizing the extended Lekhnitskii-Eshelby-Stroh formalism. The asymptotic in-plane field is used to predict the domain switching zone applying the energy-based criterion. The influence of the thermal misfit strain on the size and shape of the switching zone in the piezoelectric layer is computed for various initial poling directions.
[klicova_slova_en] => Small-scale domain switching; Piezoelectric interface crack; Expanded LES formalism; Two-state H-integral
[vysledek_datum] => 2026-02-17T00:00:00+01:00
)
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(
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[nazev] => Physics-Informed Neural Networks for Multiscale Large Deformation Analysis of Metamaterials
[nazev_orig] => Physics-Informed Neural Networks for Multiscale Large Deformation Analysis of Metamaterials
[duvernost_udaju_id] => S
[popis] => Physics-informed neural networks (PINNs) have recently emerged as a promising alternative to traditional numerical methods for solving solid mechanics problems. In this work, we propose a novel PINN architecture designed for homogenisation problems of metamaterials under large deformation. The architecture incorporates periodic functions to ensure exactly imposed boundary conditions and employs an energy-based loss for efficient training. Three representative metamaterial structures—octet truss, gyroid, and spindoid—are selected as case studies. The results demonstrate that the proposed PINN achieves accuracy comparable to finite element analysis (FEA), while offering improved computational efficiency for high-volume-fraction structures. Beyond accuracy and speed, the meshfree nature and flexibility of PINNs provide clear advantages, highlighting their potential as a scalable tool for modelling complex materials.
[popis_orig] => Physics-informed neural networks (PINNs) have recently emerged as a promising alternative to traditional numerical methods for solving solid mechanics problems. In this work, we propose a novel PINN architecture designed for homogenisation problems of metamaterials under large deformation. The architecture incorporates periodic functions to ensure exactly imposed boundary conditions and employs an energy-based loss for efficient training. Three representative metamaterial structures—octet truss, gyroid, and spindoid—are selected as case studies. The results demonstrate that the proposed PINN achieves accuracy comparable to finite element analysis (FEA), while offering improved computational efficiency for high-volume-fraction structures. Beyond accuracy and speed, the meshfree nature and flexibility of PINNs provide clear advantages, highlighting their potential as a scalable tool for modelling complex materials.
[klicova_slova] => Physics informed neural network; Homogenisation; Metamaterials; Multiscale Analysis
[klicova_slova_orig] => Physics informed neural network; Homogenisation; Metamaterials; Multiscale Analysis
[url] => https://www.sciencedirect.com/science/article/pii/S2452321626001058
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[citace_text] => LI, H.; KHODAEI, Z.; KOTOUL, M.; ALIABADI, M. Physics-Informed Neural Networks for Multiscale Large Deformation Analysis of Metamaterials. Procedia Structural Integrity. Procedia Structural Integrity. Elsevier BV, 2026. p. 23-30.
[citace_html] => LI, H.; KHODAEI, Z.; KOTOUL, M.; ALIABADI, M. Physics-Informed Neural Networks for Multiscale Large Deformation Analysis of Metamaterials. Procedia Structural Integrity. Procedia Structural Integrity. Elsevier BV, 2026. p. 23-30.
[citace_rtf] =>
[citace_bibtex] => @misc{BUT201477,
author="{} and {} and Michal {Kotoul} and {}",
title="Physics-Informed Neural Networks for Multiscale Large Deformation Analysis of Metamaterials",
booktitle="Procedia Structural Integrity",
year="2026",
journal="Procedia Structural Integrity",
volume="80",
pages="23--30",
publisher="Elsevier BV",
doi="10.1016/j.prostr.2026.02.003",
url="https://www.sciencedirect.com/science/article/pii/S2452321626001058",
note="Other unclassified results"
}
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[nazev_en] => Physics-Informed Neural Networks for Multiscale Large Deformation Analysis of Metamaterials
[popis_en] => Physics-informed neural networks (PINNs) have recently emerged as a promising alternative to traditional numerical methods for solving solid mechanics problems. In this work, we propose a novel PINN architecture designed for homogenisation problems of metamaterials under large deformation. The architecture incorporates periodic functions to ensure exactly imposed boundary conditions and employs an energy-based loss for efficient training. Three representative metamaterial structures—octet truss, gyroid, and spindoid—are selected as case studies. The results demonstrate that the proposed PINN achieves accuracy comparable to finite element analysis (FEA), while offering improved computational efficiency for high-volume-fraction structures. Beyond accuracy and speed, the meshfree nature and flexibility of PINNs provide clear advantages, highlighting their potential as a scalable tool for modelling complex materials.
[klicova_slova_en] => Physics informed neural network; Homogenisation; Metamaterials; Multiscale Analysis
[vysledek_datum] => 2026-02-16T00:00:00+01:00
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(
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[nazev] => Fatigue life prediction of weld joints: Microstructural variation can be omitted while residual stress consideration is essential
[nazev_orig] => Fatigue life prediction of weld joints: Microstructural variation can be omitted while residual stress consideration is essential
[duvernost_udaju_id] => S
[popis] => The work focused on residual fatigue life (RFL) prediction of non-standard dog bone specimens made of the low alloy steel P265GH containing a butt weld joint (Double-Bevel-Groove-Weld). Numerical predictions were based on crack growth rate data measured on the standard compact tension (C(T)) specimens fabricated from the three structural parts of the weld joint, the base metal, the weld metal and the heat-affected zone. X-ray diffraction measurement technique was used to determine residual stress distribution in the weld joints. The results were incorporated into the numerical model. Residual stress profiles in the C(T) and the dog bone specimens exhibited significant differences. Even the lower bound of the crack propagation data obtained from the standard laboratory specimens can be non-conservative. When no residual stress was considered in the numerical model, the computed RFLs of the dog bone specimens in the as-welded state were much different from the experimental results. Consideration of different material data for each weld zone, which is the standard method, resulted in highly non-conservative results. Consideration of the residual stress field in the numerical model was crucial to reach good agreement with the experiments (relative error of about 7-10%). Variation of microstructure did not affect crack growth rates significantly. The base metal data alone were sufficient for all simulations, making the demanding procedure of material data acquisition for each of the weld zones unnecessary. The results helped to bring clarity and understanding to the issue of fatigue of weld joints, contributing to both science and applications.
[popis_orig] => The work focused on residual fatigue life (RFL) prediction of non-standard dog bone specimens made of the low alloy steel P265GH containing a butt weld joint (Double-Bevel-Groove-Weld). Numerical predictions were based on crack growth rate data measured on the standard compact tension (C(T)) specimens fabricated from the three structural parts of the weld joint, the base metal, the weld metal and the heat-affected zone. X-ray diffraction measurement technique was used to determine residual stress distribution in the weld joints. The results were incorporated into the numerical model. Residual stress profiles in the C(T) and the dog bone specimens exhibited significant differences. Even the lower bound of the crack propagation data obtained from the standard laboratory specimens can be non-conservative. When no residual stress was considered in the numerical model, the computed RFLs of the dog bone specimens in the as-welded state were much different from the experimental results. Consideration of different material data for each weld zone, which is the standard method, resulted in highly non-conservative results. Consideration of the residual stress field in the numerical model was crucial to reach good agreement with the experiments (relative error of about 7-10%). Variation of microstructure did not affect crack growth rates significantly. The base metal data alone were sufficient for all simulations, making the demanding procedure of material data acquisition for each of the weld zones unnecessary. The results helped to bring clarity and understanding to the issue of fatigue of weld joints, contributing to both science and applications.
[klicova_slova] => Weld joint; Residual stress; Residual fatigue life; Finite element analysis; Low alloy steel
[klicova_slova_orig] => Weld joint; Residual stress; Residual fatigue life; Finite element analysis; Low alloy steel
[url] => https://www.sciencedirect.com/science/article/pii/S0013794425008707
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[odpovedny_utvar_nazev] => Ústav mechaniky těles, mechatroniky a biomechaniky
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[vycet_osob] => TICHOŇ, D.; VOJTEK, T.; JAMBOR, M.; DLHÝ, P.; TRSKO, L.; VLCEK, L.; NÁHLÍK, L.; HUTAŘ, P.
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[druh_popis] => Článek v odborném periodiku je obsažen v databázi Web of Science společností Thomson Reuters s příznakem „Article“, „Review“ nebo „Letter“
[stav] => Schválený
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[ins_ts] => 2026-02-20
[upd_ts] => 2026-02-20
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[identifikator] => ISSN 0013-7944
[identifikator_popis] => ISSN - ENGINEERING FRACTURE MECHANICS (GB)
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[citace_text] => TICHOŇ, D.; VOJTEK, T.; JAMBOR, M.; DLHÝ, P.; TRSKO, L.; VLCEK, L.; NÁHLÍK, L.; HUTAŘ, P. Fatigue life prediction of weld joints: Microstructural variation can be omitted while residual stress consideration is essential. ENGINEERING FRACTURE MECHANICS, 2026, vol. 331, no. 1, 27 p.
[citace_html] => TICHOŇ, D.; VOJTEK, T.; JAMBOR, M.; DLHÝ, P.; TRSKO, L.; VLCEK, L.; NÁHLÍK, L.; HUTAŘ, P. Fatigue life prediction of weld joints: Microstructural variation can be omitted while residual stress consideration is essential. ENGINEERING FRACTURE MECHANICS, 2026, vol. 331, no. 1, 27 p.
[citace_rtf] =>
[citace_bibtex] => @article{BUT201483,
author="Dušan {Tichoň} and {} and Michal {Jambor} and Pavol {Dlhý} and {} and {} and Luboš {Náhlík} and Pavel {Hutař}",
title="Fatigue life prediction of weld joints: Microstructural variation can be omitted while residual stress consideration is essential",
journal="ENGINEERING FRACTURE MECHANICS",
year="2026",
volume="331",
number="1",
pages="27",
doi="10.1016/j.engfracmech.2025.111669",
issn="0013-7944",
url="https://www.sciencedirect.com/science/article/pii/S0013794425008707"
}
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[nazev_en] => Fatigue life prediction of weld joints: Microstructural variation can be omitted while residual stress consideration is essential
[popis_en] => The work focused on residual fatigue life (RFL) prediction of non-standard dog bone specimens made of the low alloy steel P265GH containing a butt weld joint (Double-Bevel-Groove-Weld). Numerical predictions were based on crack growth rate data measured on the standard compact tension (C(T)) specimens fabricated from the three structural parts of the weld joint, the base metal, the weld metal and the heat-affected zone. X-ray diffraction measurement technique was used to determine residual stress distribution in the weld joints. The results were incorporated into the numerical model. Residual stress profiles in the C(T) and the dog bone specimens exhibited significant differences. Even the lower bound of the crack propagation data obtained from the standard laboratory specimens can be non-conservative. When no residual stress was considered in the numerical model, the computed RFLs of the dog bone specimens in the as-welded state were much different from the experimental results. Consideration of different material data for each weld zone, which is the standard method, resulted in highly non-conservative results. Consideration of the residual stress field in the numerical model was crucial to reach good agreement with the experiments (relative error of about 7-10%). Variation of microstructure did not affect crack growth rates significantly. The base metal data alone were sufficient for all simulations, making the demanding procedure of material data acquisition for each of the weld zones unnecessary. The results helped to bring clarity and understanding to the issue of fatigue of weld joints, contributing to both science and applications.
[klicova_slova_en] => Weld joint; Residual stress; Residual fatigue life; Finite element analysis; Low alloy steel
[vysledek_datum] => 2026-01-22T00:00:00+01:00
)
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[nazev] => Practical Applicability of Tree Spacing Passability Analysis on Vehicle Path Planning
[nazev_orig] => Practical Applicability of Tree Spacing Passability Analysis on Vehicle Path Planning
[duvernost_udaju_id] => S
[popis] => The article describes an off-road passability analysis as a key component of many autonomous systems, where plenty of geographical, technical as well as tactical factors or conditions must be included. One of the most challenging environments for the assessment of trafficability is forest. The major factor determining the trafficability through forests is a tree spacing. However, even if tree spacing is wider than the width of a vehicle, the passability is not guaranteed. The object of this paper is to point out that digital data files from the varied forests types were obtained by a geodetic as well as aerial photogrammetric methods. That data sources can be considered as an essential factor of digital battlefield environment influencing the path's length extension. Predetermined routes were calculated and compared via two types of analyses in order to verify if they can be used as an input factor for autonomous ground vehicle's (UGV) decision making process. This analysis can be modified and extended due to other geographical, tactical or technical features using others terrain feature modelling and advanced algorithms, subsequently that results can be used for commander's decision-making process.
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[klicova_slova] => Passability in forest; algorithms for off-road maneuverer; ArcGIS analysis; trafficability calculation in a terrain; off-road navigation; optimization of routes; cross-country movement; terrain feature modelling; algorithms for path planning
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The numerical model for three different position of the rail and wheel were designed
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The numerical model for three different position of the rail and wheel were designed
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[nazev_en] => COMPUTATIONAL ANALYSIS OF RESIDUAL STRESS AFTER SHEET FORMING OF THE BRAKING RESISTOR GRID COMPONENTS
[popis_en] => Braking resistor is a device for transformation of electric power into heat energy. During electrodynamic braking of a traction vehicle the metal sheets warm up to high temperature (up to 900 deg C). This temperature gives rise to plastic strain and buckling of metal sheets. For a realistic buckling analysis results, the influence of residual stress after a sheet forming of resistor components should be taken into account.
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[nazev] => EXPERIMENTAL AND COMPUTATIONAL ANALYSIS OF PASS ROLLING
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[popis] => Optimal position of nozzles and cooling spray direction can be decisive for the working life of pass rolls. We present this influence on the example of the last roll in the U65-profile sequence, where the internal corner represents a critical point where a crack can be initiated very early.
[popis_orig] => Optimal position of nozzles and cooling spray direction can be decisive for the working life of pass rolls. We present this influence on the example of the last roll in the U65-profile sequence, where the internal corner represents a critical point where a crack can be initiated very early.
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[citace_text] => PETRUŠKA, J.; HORSKÝ, J.; VAVREČKA, L. EXPERIMENTAL AND COMPUTATIONAL ANALYSIS OF PASS ROLLING. In 23rd danubia adria symposium. Žilina: TU Zilina, 2006. p. 33-34. ISBN: 80-8070-589-5.
[citace_html] => PETRUŠKA, J.; HORSKÝ, J.; VAVREČKA, L. EXPERIMENTAL AND COMPUTATIONAL ANALYSIS OF PASS ROLLING. In 23rd danubia adria symposium. Žilina: TU Zilina, 2006. p. 33-34. ISBN: 80-8070-589-5.
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author="Jindřich {Petruška} and Jaroslav {Horský} and Lukáš {Vavrečka}",
title="EXPERIMENTAL AND COMPUTATIONAL ANALYSIS OF PASS ROLLING",
booktitle="23rd danubia adria symposium",
year="2006",
pages="33--34",
publisher="TU Zilina",
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