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[nazev] => Modelling of the ceramic foam behaviour upon tensile loading
[nazev_orig] => Modelling of the ceramic foam behaviour upon tensile loading
[duvernost_udaju_id] => S
[popis] => The contribution deals with numerical simulation of response of the open cell ceramic foam to tensile loading and attempts to predict experimental behavior of the foams using numerical FE model composed of beam elements. Models of different structure irregularity (including regular one) are considered and generated using 3D Voronoi tessellation technique. Complete fracture of the model is simulated by iterative FE simulations where in each step, one strut with maximal tensile stress (higher than the material tensile strength) is removed. Critical forces, leading to complete breakage of the foam structure, together with final fracture “surfaces”, are investigated and compared for both regular and irregular structures.
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[klicova_slova] => ceramic foam; fracture; tensile loading
[klicova_slova_orig] => ceramic foam; fracture; tensile loading
[url] => https://www.scopus.com/record/display.uri?eid=2-s2.0-85066016025&origin=inward&txGid=a1905ad70fca15d665bff277b4c110a6
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[citace_text] => ŠEVEČEK, O.; SKALKA, P.; KOTOUL, M. Modelling of the ceramic foam behaviour upon tensile loading. Greece: 2017. no. 2017, p. 859-860.
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author="Oldřich {Ševeček} and Petr {Skalka} and Michal {Kotoul}",
title="Modelling of the ceramic foam behaviour upon tensile loading",
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volume="2",
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address="Greece",
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title="Homogenized model of piezoelectric composite structure for sensing purposes",
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year="2019",
pages="358--365",
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booktitle="36th Danubia Adria Symposium on Advances in Experimental Mechanics",
year="2019",
pages="121--122",
publisher="University of West Bohemia",
address="Plzeň",
isbn="978-802610876-4"
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[nazev_en] => The Influence of the Callus Shape and Level of Consolidation on Stress and Strain in Femur with Distraction Intramedullary Nail – FE Study
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[duvernost_udaju_id] => S
[popis] => While mixed-mode loading conditions became hot topic recently, it is still quite unexplored area, even in case of metals. In case of polymers, this is even more complex problem, thanks to their higher sensitivity on higher temperatures connected with friction. Since polymer materials are very popular, this topic is of high interest. One of the best experimental specimens for achieving mixed mode loading conditions is the CRB specimen, as it provides clear mixed-mode I + III conditions under tension + torsion. Furthermore, for lifetime predictions it is necessary to calculate some material constants based on measured crack growth rates. However, these crack growth rates are not as easily and accurately measured on CRB specimens, as on CT specimens. Therefore, the main focus of this study is to observe difference between lifetime predictions based on CT and CRB data and possible application of CT data for CRB specimens.
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[klicova_slova] => CRB testLifetime predictionMixed-mode fatigue crackPolyoxymethelene
[klicova_slova_orig] => CRB testLifetime predictionMixed-mode fatigue crackPolyoxymethelene
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[upravil] => Informační systém Automat
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[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
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[identifikator] => ISBN 9783035715866 ISSN 1013-9826
[identifikator_popis] => ISBN - Key Engineering Materials ISSN - Key Engineering Materials (print) (CH)
[riv_dodavka_id] => 2549
[riv_dodavka_oznaceni] => RIV21-MSM-26210___
[riv_dodavka_rok] => 2021
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[citace_text] => SLÁVIK, O.; HUTAŘ, P.; GOSCH, A.; BERER, M.; VOJTEK, T.; ARBEITER, F.; PINTER, G.; NÁHLÍK, L. Fatigue crack propagation under mixed mode I and III in polyoxymethelene homopolymer. In Key Engineering Materials. Key Engineering Materials (print). Scientific.Net, 2020. no. 827, p. 404-409. ISBN: 9783035715866. ISSN: 1013-9826.
[citace_html] => SLÁVIK, O.; HUTAŘ, P.; GOSCH, A.; BERER, M.; VOJTEK, T.; ARBEITER, F.; PINTER, G.; NÁHLÍK, L. Fatigue crack propagation under mixed mode I and III in polyoxymethelene homopolymer. In Key Engineering Materials. Key Engineering Materials (print). Scientific.Net, 2020. no. 827, p. 404-409. ISBN: 9783035715866. ISSN: 1013-9826.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT170329,
author="Ondrej {Slávik} and Pavel {Hutař} and Anja {Gosch} and Michael {Berer} and Tomáš {Vojtek} and Florian {Arbeiter} and Gerald {Pinter} and Luboš {Náhlík}",
title="Fatigue crack propagation under mixed mode I and III in polyoxymethelene homopolymer",
booktitle="Key Engineering Materials",
year="2020",
journal="Key Engineering Materials (print)",
number="827",
pages="404--409",
publisher="Scientific.Net",
doi="10.4028/www.scientific.net/KEM.827.404",
isbn="9783035715866",
issn="1013-9826",
url="https://www.scientific.net/KEM.827.404"
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[oecd_tree_podobor_nazev] => Mechanical engineering
[poznamka_metriky] =>
[nazev_en] => Fatigue crack propagation under mixed mode I and III in polyoxymethelene homopolymer
[popis_en] => While mixed-mode loading conditions became hot topic recently, it is still quite unexplored area, even in case of metals. In case of polymers, this is even more complex problem, thanks to their higher sensitivity on higher temperatures connected with friction. Since polymer materials are very popular, this topic is of high interest. One of the best experimental specimens for achieving mixed mode loading conditions is the CRB specimen, as it provides clear mixed-mode I + III conditions under tension + torsion. Furthermore, for lifetime predictions it is necessary to calculate some material constants based on measured crack growth rates. However, these crack growth rates are not as easily and accurately measured on CRB specimens, as on CT specimens. Therefore, the main focus of this study is to observe difference between lifetime predictions based on CT and CRB data and possible application of CT data for CRB specimens.
[klicova_slova_en] => CRB testLifetime predictionMixed-mode fatigue crackPolyoxymethelene
[vysledek_datum] => 2020-01-01T00:00:00+01:00
)
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[nazev] => Electromagnetic rolling mass energy harvesting device for low frequency excitation
[nazev_orig] => Electromagnetic rolling mass energy harvesting device for low frequency excitation
[duvernost_udaju_id] => S
[popis] => This paper deals with a development of an electromagnetic energy harvesting device for low frequency excitation. The energy harvesting device could convert kinetic energy of vibration into useful electricity for powering of wireless sensor nodes or autonomous monitoring and reporting devices. Low frequency of vibrations occurs in many engineering applications, e.g. transportation. The developed energy harvesting device transforms vibration into rolling movement of magnetic circuits against fixed coils and kinetic energy of this movement is converted into electricity on the base of Faraday’s Law. The design of this energy harvesting device with a rolling mass could allow a tuning up of operation frequency for very low resonance in range 1–2 Hz. The operation of this device in the frequency bandwidth could be used as autonomous source of electrical energy for ultra-low power electronics.
[popis_orig] => This paper deals with a development of an electromagnetic energy harvesting device for low frequency excitation. The energy harvesting device could convert kinetic energy of vibration into useful electricity for powering of wireless sensor nodes or autonomous monitoring and reporting devices. Low frequency of vibrations occurs in many engineering applications, e.g. transportation. The developed energy harvesting device transforms vibration into rolling movement of magnetic circuits against fixed coils and kinetic energy of this movement is converted into electricity on the base of Faraday’s Law. The design of this energy harvesting device with a rolling mass could allow a tuning up of operation frequency for very low resonance in range 1–2 Hz. The operation of this device in the frequency bandwidth could be used as autonomous source of electrical energy for ultra-low power electronics.
[klicova_slova] => Electromagnetic, Energy harvesting, Low frequency excitation, Rolling mass, Vibration
[klicova_slova_orig] => Electromagnetic, Energy harvesting, Low frequency excitation, Rolling mass, Vibration
[url] =>
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[vycet_osob] => HADAŠ, Z.; PINČEK, L.
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[identifikator] => ISBN 978-3-030-29992-7 ISSN 2194-5357
[identifikator_popis] => ISBN - Mechatronics 2019: Recent Advances Towards Industry 4.0 ISSN - Advances in Intelligent Systems and Computing (CH)
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[citace_text] => HADAŠ, Z.; PINČEK, L. Electromagnetic rolling mass energy harvesting device for low frequency excitation. In Mechatronics 2019: Recent Advances Towards Industry 4.0. Advances in Intelligent Systems and Computing. Springer Verlag, 2019. p. 316-323. ISBN: 978-3-030-29992-7. ISSN: 2194-5357.
[citace_html] => HADAŠ, Z.; PINČEK, L. Electromagnetic rolling mass energy harvesting device for low frequency excitation. In Mechatronics 2019: Recent Advances Towards Industry 4.0. Advances in Intelligent Systems and Computing. Springer Verlag, 2019. p. 316-323. ISBN: 978-3-030-29992-7. ISSN: 2194-5357.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT170367,
author="Zdeněk {Hadaš} and Ladislav {Pinček}",
title="Electromagnetic rolling mass energy harvesting device for low frequency excitation",
booktitle="Mechatronics 2019: Recent Advances Towards Industry 4.0",
year="2019",
journal="Advances in Intelligent Systems and Computing",
volume="1044",
pages="316--323",
publisher="Springer Verlag",
doi="10.1007/978-3-030-29993-4\{_}39",
isbn="978-3-030-29992-7",
issn="2194-5357"
}
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[poznamka_metriky] =>
[nazev_en] => Electromagnetic rolling mass energy harvesting device for low frequency excitation
[popis_en] => This paper deals with a development of an electromagnetic energy harvesting device for low frequency excitation. The energy harvesting device could convert kinetic energy of vibration into useful electricity for powering of wireless sensor nodes or autonomous monitoring and reporting devices. Low frequency of vibrations occurs in many engineering applications, e.g. transportation. The developed energy harvesting device transforms vibration into rolling movement of magnetic circuits against fixed coils and kinetic energy of this movement is converted into electricity on the base of Faraday’s Law. The design of this energy harvesting device with a rolling mass could allow a tuning up of operation frequency for very low resonance in range 1–2 Hz. The operation of this device in the frequency bandwidth could be used as autonomous source of electrical energy for ultra-low power electronics.
[klicova_slova_en] => Electromagnetic, Energy harvesting, Low frequency excitation, Rolling mass, Vibration
[vysledek_datum] => 2019-09-16T00:00:00+02:00
)
[5] => Array
(
[vysledek_id] => 170368
[vysledek_druh_id] => ARTWOS
[ex_vysledek_id] => 140058
[vysledek_rok] => 2021
[nazev] => SENSING RAIL SYSTEM WITH PIEZOELECTRIC ELEMENTS
[nazev_orig] => SENSING RAIL SYSTEM WITH PIEZOELECTRIC ELEMENTS
[duvernost_udaju_id] => S
[popis] => This paper deals with piezoelectric strain measurement for rail monitoring applications. Piezoelectric materials under mechanical load generate electric charge and thus provide active voltage response. Mechanical parts with piezoelectric sensing layers could provide electrical signal which is proportional with mechanical loads and vibration. Presented piezoelectric system in the form of a macro fiber composite (MFC) or polymer polyvinylidene fluoride (PVDF) could be used for monitoring applications. A lab application shows the potential of these sensors and the piezoelectric response is compared with the strain gauge measurement. A real application on a regional track is proposed and the piezoelectric patch is integrated on the rail. Analysis of the obtained voltage signal is compared with the traditional acceleration analysis. Proposed solution provides an affordable sensing system which could monitor and detect system wear or maximal deformation under operation.
[popis_orig] => This paper deals with piezoelectric strain measurement for rail monitoring applications. Piezoelectric materials under mechanical load generate electric charge and thus provide active voltage response. Mechanical parts with piezoelectric sensing layers could provide electrical signal which is proportional with mechanical loads and vibration. Presented piezoelectric system in the form of a macro fiber composite (MFC) or polymer polyvinylidene fluoride (PVDF) could be used for monitoring applications. A lab application shows the potential of these sensors and the piezoelectric response is compared with the strain gauge measurement. A real application on a regional track is proposed and the piezoelectric patch is integrated on the rail. Analysis of the obtained voltage signal is compared with the traditional acceleration analysis. Proposed solution provides an affordable sensing system which could monitor and detect system wear or maximal deformation under operation.
[klicova_slova] => Piezoelectric, PVDF, MFC, Strain Sensor, Rail, Deformation, Monitoring
[klicova_slova_orig] => Piezoelectric, PVDF, MFC, Strain Sensor, Rail, Deformation, Monitoring
[url] => https://www.mmscience.eu/journal/issues/march-2021/articles/sensing-rail-system-with-piezoelectric-elements
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[nadrazena_soucast_nazev] => Fakulta strojního inženýrství
[originalni_jazyk] => en
[schvalil_id] => 182808
[schvaleno] => 2022-01-14
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[vycet_osob] => MACHŮ, Z.; KRATOCHVÍLOVÁ, M.; KŠICA, F.; PODROUŽEK, J.; HADAŠ, Z.
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[kod_doi] => 10.17973/MMSJ.2021_03_2020066
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[kategorie_nazev] => Publikační výsledky
[druh_nazev] => Článek WoS
[druh_popis] => Článek v odborném periodiku je obsažen v databázi Web of Science společností Thomson Reuters s příznakem „Article“, „Review“ nebo „Letter“
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[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
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[identifikator] => ISSN 1803-1269
[identifikator_popis] => ISSN - MM Science Journal (CZ)
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[riv_dodavka_oznaceni] => RIV21-GA0-26210___
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[citace_text] => MACHŮ, Z.; KRATOCHVÍLOVÁ, M.; KŠICA, F.; PODROUŽEK, J.; HADAŠ, Z. SENSING RAIL SYSTEM WITH PIEZOELECTRIC ELEMENTS. MM Science Journal, 2021, no. March 2021, p. 4230-4237. ISSN: 1805-0476.
[citace_html] => MACHŮ, Z.; KRATOCHVÍLOVÁ, M.; KŠICA, F.; PODROUŽEK, J.; HADAŠ, Z. SENSING RAIL SYSTEM WITH PIEZOELECTRIC ELEMENTS. MM Science Journal, 2021, no. March 2021, p. 4230-4237. ISSN: 1805-0476.
[citace_rtf] =>
[citace_bibtex] => @article{BUT170368,
author="Zdeněk {Machů} and Martina {Floriánová} and Filip {Kšica} and Jan {Podroužek} and Zdeněk {Hadaš}",
title="SENSING RAIL SYSTEM WITH PIEZOELECTRIC ELEMENTS",
journal="MM Science Journal",
year="2021",
number="March 2021",
pages="4230--4237",
doi="10.17973/MMSJ.2021\{_}03\{_}2020066",
issn="1803-1269",
url="https://www.mmscience.eu/journal/issues/march-2021/articles/sensing-rail-system-with-piezoelectric-elements"
}
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[oecd_tree_podobor_id] => 20301
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[nazev_en] => SENSING RAIL SYSTEM WITH PIEZOELECTRIC ELEMENTS
[popis_en] => This paper deals with piezoelectric strain measurement for rail monitoring applications. Piezoelectric materials under mechanical load generate electric charge and thus provide active voltage response. Mechanical parts with piezoelectric sensing layers could provide electrical signal which is proportional with mechanical loads and vibration. Presented piezoelectric system in the form of a macro fiber composite (MFC) or polymer polyvinylidene fluoride (PVDF) could be used for monitoring applications. A lab application shows the potential of these sensors and the piezoelectric response is compared with the strain gauge measurement. A real application on a regional track is proposed and the piezoelectric patch is integrated on the rail. Analysis of the obtained voltage signal is compared with the traditional acceleration analysis. Proposed solution provides an affordable sensing system which could monitor and detect system wear or maximal deformation under operation.
[klicova_slova_en] => Piezoelectric, PVDF, MFC, Strain Sensor, Rail, Deformation, Monitoring
[vysledek_datum] => 2021-03-03T00:00:00+01:00
)
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(
[vysledek_id] => 170578
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[nazev] => Fatigue lifetime estimation of railway axles
[nazev_orig] => Fatigue lifetime estimation of railway axles
[duvernost_udaju_id] => S
[popis] => The railway axles are subjected to cyclic loading during their operation. Their load is of long-term nature, therefore a real risk of fatigue failure exists. This failure could lead to derailment of the whole train with serious consequences. To prevent such scenario, the railway axles have to be safely removed from operation before their final failure occurs. This paper presents methodology for the residual fatigue lifetime prediction of the railway axle based on the linear elastic fracture mechanics concept. The methodology contains estimation of the critical position of initial crack, prediction of the fatigue crack front shape development during crack propagation, separation of the bending and press-fitting contributions to the axle load, experimental measurement of the crack growth kinetics of EA4T steel and subsequent estimation of the residual fatigue lifetime of railway axle. Part of the presented study is also devoted to the probability aspects of determination of material characteristics describing fatigue crack propagation and retardation effects caused by existence of plastic zone ahead of propagating fatigue crack. Described methodology is already applied in the design process of new railway axles in Bonatrans company. (C) 2016 Elsevier Ltd. All rights reserved.
[popis_orig] => The railway axles are subjected to cyclic loading during their operation. Their load is of long-term nature, therefore a real risk of fatigue failure exists. This failure could lead to derailment of the whole train with serious consequences. To prevent such scenario, the railway axles have to be safely removed from operation before their final failure occurs. This paper presents methodology for the residual fatigue lifetime prediction of the railway axle based on the linear elastic fracture mechanics concept. The methodology contains estimation of the critical position of initial crack, prediction of the fatigue crack front shape development during crack propagation, separation of the bending and press-fitting contributions to the axle load, experimental measurement of the crack growth kinetics of EA4T steel and subsequent estimation of the residual fatigue lifetime of railway axle. Part of the presented study is also devoted to the probability aspects of determination of material characteristics describing fatigue crack propagation and retardation effects caused by existence of plastic zone ahead of propagating fatigue crack. Described methodology is already applied in the design process of new railway axles in Bonatrans company. (C) 2016 Elsevier Ltd. All rights reserved.
[klicova_slova] => Residual fatigue lifetime; Railway axle; Variable amplitude loading; Fatigue crack propagation; Damage tolerance methodology
[klicova_slova_orig] => Residual fatigue lifetime; Railway axle; Variable amplitude loading; Fatigue crack propagation; Damage tolerance methodology
[url] => https://www.sciencedirect.com/science/article/pii/S1350630716307506
[oecd_obor_id] => 20301
[odpovedny_utvar_id] => 157
[odpovedny_utvar_nazev] => Ústav mechaniky těles, mechatroniky a biomechaniky
[odpovedny_utvar_zkratka] => ÚMTMB
[nadrazena_soucast_id] => 4
[nadrazena_soucast_zkratka] => FSI
[nadrazena_soucast_nazev] => Fakulta strojního inženýrství
[originalni_jazyk] => en
[schvalil_id] => 182808
[schvaleno] => 2021-04-30
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[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => NÁHLÍK, L.; POKORNÝ, P.; FAJKOŠ, R.; HUTAŘ, P., ŠEVČÍK M., MATUŠEK P.
[pocet_tvurcu] => 6
[tvurci_ids] =>
[poznamka] =>
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[kod_doi] => 10.1016/j.engfailanal.2016.12.014
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[citace_text] => NÁHLÍK, L.; POKORNÝ, P.; FAJKOŠ, R.; HUTAŘ, P., ŠEVČÍK M., MATUŠEK P. Fatigue lifetime estimation of railway axles. Engineering Failure Analysis, 2017, vol. 2017, no. 73, p. 139-157. ISSN: 1350-6307.
[citace_html] => NÁHLÍK, L.; POKORNÝ, P.; FAJKOŠ, R.; HUTAŘ, P., ŠEVČÍK M., MATUŠEK P. Fatigue lifetime estimation of railway axles. Engineering Failure Analysis, 2017, vol. 2017, no. 73, p. 139-157. ISSN: 1350-6307.
[citace_rtf] =>
[citace_bibtex] => @article{BUT170578,
author="Luboš {Náhlík} and Pavel {Pokorný} and Rostislav {Fajkoš} and Pavel {Hutař}",
title="Fatigue lifetime estimation of railway axles",
journal="Engineering Failure Analysis",
year="2017",
volume="2017",
number="73",
pages="139--157",
doi="10.1016/j.engfailanal.2016.12.014",
issn="1350-6307",
url="https://www.sciencedirect.com/science/article/pii/S1350630716307506"
}
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[nazev_en] => Fatigue lifetime estimation of railway axles
[popis_en] => The railway axles are subjected to cyclic loading during their operation. Their load is of long-term nature, therefore a real risk of fatigue failure exists. This failure could lead to derailment of the whole train with serious consequences. To prevent such scenario, the railway axles have to be safely removed from operation before their final failure occurs. This paper presents methodology for the residual fatigue lifetime prediction of the railway axle based on the linear elastic fracture mechanics concept. The methodology contains estimation of the critical position of initial crack, prediction of the fatigue crack front shape development during crack propagation, separation of the bending and press-fitting contributions to the axle load, experimental measurement of the crack growth kinetics of EA4T steel and subsequent estimation of the residual fatigue lifetime of railway axle. Part of the presented study is also devoted to the probability aspects of determination of material characteristics describing fatigue crack propagation and retardation effects caused by existence of plastic zone ahead of propagating fatigue crack. Described methodology is already applied in the design process of new railway axles in Bonatrans company. (C) 2016 Elsevier Ltd. All rights reserved.
[klicova_slova_en] => Residual fatigue lifetime; Railway axle; Variable amplitude loading; Fatigue crack propagation; Damage tolerance methodology
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[nazev] => Influence of Initial Inclined Surface Crack on Estimated Residual Fatigue Lifetime of Railway Axle
[nazev_orig] => Influence of Initial Inclined Surface Crack on Estimated Residual Fatigue Lifetime of Railway Axle
[duvernost_udaju_id] => S
[popis] => Railway axles are subjected to cyclic loading which can lead to fatigue failure. For safe operation of railway axles a damage tolerance approach taking into account a possible defect on railway axle surface is often required. The contribution deals with an estimation of residual fatigue lifetime of railway axle with initial inclined surface crack. 3D numerical model of inclined semi-elliptical surface crack in railway axle was developed and its curved propagation through the axle was simulated by finite element method. Presence of press-fitted wheel in the vicinity of initial crack was taken into account. A typical loading spectrum of railway axle was considered and residual fatigue lifetime was estimated by NASGRO approach. Material properties of typical axle steel EA4T were considered in numerical calculations and lifetime estimation.
[popis_orig] => Railway axles are subjected to cyclic loading which can lead to fatigue failure. For safe operation of railway axles a damage tolerance approach taking into account a possible defect on railway axle surface is often required. The contribution deals with an estimation of residual fatigue lifetime of railway axle with initial inclined surface crack. 3D numerical model of inclined semi-elliptical surface crack in railway axle was developed and its curved propagation through the axle was simulated by finite element method. Presence of press-fitted wheel in the vicinity of initial crack was taken into account. A typical loading spectrum of railway axle was considered and residual fatigue lifetime was estimated by NASGRO approach. Material properties of typical axle steel EA4T were considered in numerical calculations and lifetime estimation.
[klicova_slova] => Inclined crack; railway axle; residual fatigue lifetime; fatigue crack propagation
[klicova_slova_orig] => Inclined crack; railway axle; residual fatigue lifetime; fatigue crack propagation
[url] => https://www.worldscientific.com/doi/abs/10.1142/S1756973716400072
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[citace_text] => NÁHLÍK, L.; POKORNÝ, P.; ŠEVČÍK, M.; HUTAŘ, P. Influence of Initial Inclined Surface Crack on Estimated Residual Fatigue Lifetime of Railway Axle. Journal of multiscale modelling, 2017, vol. 7, no. 4, p. 1-6. ISSN: 1756-9737.
[citace_html] => NÁHLÍK, L.; POKORNÝ, P.; ŠEVČÍK, M.; HUTAŘ, P. Influence of Initial Inclined Surface Crack on Estimated Residual Fatigue Lifetime of Railway Axle. Journal of multiscale modelling, 2017, vol. 7, no. 4, p. 1-6. ISSN: 1756-9737.
[citace_rtf] =>
[citace_bibtex] => @article{BUT170579,
author="Luboš {Náhlík} and Pavel {Pokorný} and Martin {Ševčík} and Pavel {Hutař}",
title="Influence of Initial Inclined Surface Crack on Estimated Residual Fatigue Lifetime of Railway Axle",
journal="Journal of multiscale modelling",
year="2017",
volume="7",
number="4",
pages="1--6",
doi="10.1142/S1756973716400072",
issn="1756-9737",
url="https://www.worldscientific.com/doi/abs/10.1142/S1756973716400072"
}
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[nazev_en] => Influence of Initial Inclined Surface Crack on Estimated Residual Fatigue Lifetime of Railway Axle
[popis_en] => Railway axles are subjected to cyclic loading which can lead to fatigue failure. For safe operation of railway axles a damage tolerance approach taking into account a possible defect on railway axle surface is often required. The contribution deals with an estimation of residual fatigue lifetime of railway axle with initial inclined surface crack. 3D numerical model of inclined semi-elliptical surface crack in railway axle was developed and its curved propagation through the axle was simulated by finite element method. Presence of press-fitted wheel in the vicinity of initial crack was taken into account. A typical loading spectrum of railway axle was considered and residual fatigue lifetime was estimated by NASGRO approach. Material properties of typical axle steel EA4T were considered in numerical calculations and lifetime estimation.
[klicova_slova_en] => Inclined crack; railway axle; residual fatigue lifetime; fatigue crack propagation
[vysledek_datum] => 2017-01-01T00:00:00+01:00
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(
[vysledek_id] => 170580
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[nazev] => Influence of variable stress ratio during train operation on residual fatigue lifetime of railway axles
[nazev_orig] => Influence of variable stress ratio during train operation on residual fatigue lifetime of railway axles
[duvernost_udaju_id] => S
[popis] => Railway axles are subjected to cyclic loading, which could lead to fatigue failure. Therefore, it is desired to know residual fatigue lifetime of railway axles to ensure safe operation of trains. Because of detection of relatively small fatigue cracks is not guaranteed an estimation of residual fatigue lifetime is based on damage tolerance approach. The acting stress ratio is variable due to variable amplitude loading and load caused by existence of press-fitted wheel in the vicinity of assumed crack. The contribution is focused on influence of variable stress ratio in EA4T steel on residual fatigue lifetime of railway axles. The influence of stress intensity factor on fatigue crack propagation rate was experimentally evaluated for three different stress ratios, which correspond to operation conditions. Two different expressions of fatigue crack propagation rate were used and mutually compared to show influence of the stress ratio on residual fatigue lifetime of structure made of EA4T steel. The first expression considers stress intensity factor range (respecting stress ratio R) and the second one uses maximal value of the stress intensity factor. The paper shows ability of both expressions to describe experimental data obtained under different stress ratios and their influence on estimated residual fatigue lifetime values. The results obtained contribute to the better estimation of residual fatigue lifetime of railway axles and generally to the safer rail transportation. Copyright (C) 2016 The Authors. Published by Elsevier B.V.
[popis_orig] => Railway axles are subjected to cyclic loading, which could lead to fatigue failure. Therefore, it is desired to know residual fatigue lifetime of railway axles to ensure safe operation of trains. Because of detection of relatively small fatigue cracks is not guaranteed an estimation of residual fatigue lifetime is based on damage tolerance approach. The acting stress ratio is variable due to variable amplitude loading and load caused by existence of press-fitted wheel in the vicinity of assumed crack. The contribution is focused on influence of variable stress ratio in EA4T steel on residual fatigue lifetime of railway axles. The influence of stress intensity factor on fatigue crack propagation rate was experimentally evaluated for three different stress ratios, which correspond to operation conditions. Two different expressions of fatigue crack propagation rate were used and mutually compared to show influence of the stress ratio on residual fatigue lifetime of structure made of EA4T steel. The first expression considers stress intensity factor range (respecting stress ratio R) and the second one uses maximal value of the stress intensity factor. The paper shows ability of both expressions to describe experimental data obtained under different stress ratios and their influence on estimated residual fatigue lifetime values. The results obtained contribute to the better estimation of residual fatigue lifetime of railway axles and generally to the safer rail transportation. Copyright (C) 2016 The Authors. Published by Elsevier B.V.
[klicova_slova] => railway axle; stress ratio; EA4T; fatigue crack
[klicova_slova_orig] => railway axle; stress ratio; EA4T; fatigue crack
[url] => https://www.sciencedirect.com/science/article/pii/S2452321616304668
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[odpovedny_utvar_nazev] => Ústav mechaniky těles, mechatroniky a biomechaniky
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[citace_text] => POKORNÝ, P.; NÁHLÍK, L.; HUTAŘ, P. Influence of variable stress ratio during train operation on residual fatigue lifetime of railway axles. Procedia Structural Integrity, 2016, vol. 2, no. 1, p. 3585-3592. ISSN: 2452-3216.
[citace_html] => POKORNÝ, P.; NÁHLÍK, L.; HUTAŘ, P. Influence of variable stress ratio during train operation on residual fatigue lifetime of railway axles. Procedia Structural Integrity, 2016, vol. 2, no. 1, p. 3585-3592. ISSN: 2452-3216.
[citace_rtf] =>
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author="Pavel {Pokorný} and Luboš {Náhlík} and Pavel {Hutař}",
title="Influence of variable stress ratio during train operation on residual fatigue lifetime of railway axles",
journal="Procedia Structural Integrity",
year="2016",
volume="2",
number="1",
pages="3585--3592",
doi="10.1016/j.prostr.2016.06.447",
url="https://www.sciencedirect.com/science/article/pii/S2452321616304668"
}
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[poznamka_metriky] =>
[nazev_en] => Influence of variable stress ratio during train operation on residual fatigue lifetime of railway axles
[popis_en] => Railway axles are subjected to cyclic loading, which could lead to fatigue failure. Therefore, it is desired to know residual fatigue lifetime of railway axles to ensure safe operation of trains. Because of detection of relatively small fatigue cracks is not guaranteed an estimation of residual fatigue lifetime is based on damage tolerance approach. The acting stress ratio is variable due to variable amplitude loading and load caused by existence of press-fitted wheel in the vicinity of assumed crack. The contribution is focused on influence of variable stress ratio in EA4T steel on residual fatigue lifetime of railway axles. The influence of stress intensity factor on fatigue crack propagation rate was experimentally evaluated for three different stress ratios, which correspond to operation conditions. Two different expressions of fatigue crack propagation rate were used and mutually compared to show influence of the stress ratio on residual fatigue lifetime of structure made of EA4T steel. The first expression considers stress intensity factor range (respecting stress ratio R) and the second one uses maximal value of the stress intensity factor. The paper shows ability of both expressions to describe experimental data obtained under different stress ratios and their influence on estimated residual fatigue lifetime values. The results obtained contribute to the better estimation of residual fatigue lifetime of railway axles and generally to the safer rail transportation. Copyright (C) 2016 The Authors. Published by Elsevier B.V.
[klicova_slova_en] => railway axle; stress ratio; EA4T; fatigue crack
[vysledek_datum] => 2016-01-01T00:00:00+01:00
)
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[nazev] => Use of polymer concrete for large-scale 3D printing
[nazev_orig] => Use of polymer concrete for large-scale 3D printing
[duvernost_udaju_id] => S
[popis] => This paper aims to focus on the evaluation of a polymer concrete as a three-dimensional (3D) printing material. An associated company has developed plastic concrete made from reused unrecyclable plastic waste. Its intended use is as a construction material.
[popis_orig] => This paper aims to focus on the evaluation of a polymer concrete as a three-dimensional (3D) printing material. An associated company has developed plastic concrete made from reused unrecyclable plastic waste. Its intended use is as a construction material.
[klicova_slova] => 3D printing, robotic fabrication, recycled thermoplastic, polymer concrete
[klicova_slova_orig] => 3D printing, robotic fabrication, recycled thermoplastic, polymer concrete
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[identifikator_popis] => ISSN - RAPID PROTOTYPING JOURNAL (GB)
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[citace_text] => KRČMA, M.; ŠKAROUPKA, D.; VOSYNEK, P.; ZIKMUND, T.; KAISER, J.; PALOUŠEK, D. Use of polymer concrete for large-scale 3D printing. RAPID PROTOTYPING JOURNAL, 2021, no. 27, p. 465-474. ISSN: 1758-7670.
[citace_html] => KRČMA, M.; ŠKAROUPKA, D.; VOSYNEK, P.; ZIKMUND, T.; KAISER, J.; PALOUŠEK, D. Use of polymer concrete for large-scale 3D printing. RAPID PROTOTYPING JOURNAL, 2021, no. 27, p. 465-474. ISSN: 1758-7670.
[citace_rtf] =>
[citace_bibtex] => @article{BUT170595,
author="Martin {Krčma} and David {Škaroupka} and Petr {Vosynek} and Tomáš {Zikmund} and Jozef {Kaiser} and David {Paloušek}",
title="Use of polymer concrete for large-scale 3D printing",
journal="RAPID PROTOTYPING JOURNAL",
year="2021",
number="27",
pages="465--474",
doi="10.1108/RPJ-12-2019-0316",
issn="1355-2546",
url="https://www.emerald.com/insight/content/doi/10.1108/RPJ-12-2019-0316/full/html"
}
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[nazev_en] => Use of polymer concrete for large-scale 3D printing
[popis_en] => This paper aims to focus on the evaluation of a polymer concrete as a three-dimensional (3D) printing material. An associated company has developed plastic concrete made from reused unrecyclable plastic waste. Its intended use is as a construction material.
[klicova_slova_en] => 3D printing, robotic fabrication, recycled thermoplastic, polymer concrete
[vysledek_datum] => 2021-02-27T00:00:00+01:00
)
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(
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[nazev] => Monotonic Testing of 3D Printed SS316L under Multiaxial Loading
[nazev_orig] => Monotonic Testing of 3D Printed SS316L under Multiaxial Loading
[duvernost_udaju_id] => S
[popis] => The aim of this work was to monitor the behaviour of 316L stainless steel produced by 3D printing. The material was tested in the state “as printed”. Digital Image Correlation measurements were used for 4 types of notches. The behaviour of these notches under monotonic loading was investigated in two loading paths – tension and torsion. Based on experimental data, two material models were used in finite element analyses. Subsequently, the load-deformation responses of simulations and experiments were compared. Ductility of 3D printed specimens in “as printed” state is also compared with 3D printed machined samples and samples produced by conventional methods.
[popis_orig] => The aim of this work was to monitor the behaviour of 316L stainless steel produced by 3D printing. The material was tested in the state “as printed”. Digital Image Correlation measurements were used for 4 types of notches. The behaviour of these notches under monotonic loading was investigated in two loading paths – tension and torsion. Based on experimental data, two material models were used in finite element analyses. Subsequently, the load-deformation responses of simulations and experiments were compared. Ductility of 3D printed specimens in “as printed” state is also compared with 3D printed machined samples and samples produced by conventional methods.
[klicova_slova] => Stainless steel S316L; 3D printing of metal; Multiaxial monotonic loading; Digital Image Correlation Method; Hill yield criterion; isotropic hardening; FEM simulation
[klicova_slova_orig] => Stainless steel S316L; 3D printing of metal; Multiaxial monotonic loading; Digital Image Correlation Method; Hill yield criterion; isotropic hardening; FEM simulation
[url] =>
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[vycet_osob] => KOŘÍNEK, M.; HALAMA, R.; FOJTÍK, F.; PAGÁČ, M.; KRČEK, J.; ŠEBEK, F.; KRZIKALLA, D.
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[identifikator] => ISBN 978-80-248-4451-0
[identifikator_popis] => ISBN - Experimental Stress Analysis 2020
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[citace_text] => KOŘÍNEK, M.; HALAMA, R.; FOJTÍK, F.; PAGÁČ, M.; KRČEK, J.; ŠEBEK, F.; KRZIKALLA, D. Monotonic Testing of 3D Printed SS316L under Multiaxial Loading. In Experimental Stress Analysis 2020. 2020. p. 213-224. ISBN: 978-80-248-4451-0.
[citace_html] => KOŘÍNEK, M.; HALAMA, R.; FOJTÍK, F.; PAGÁČ, M.; KRČEK, J.; ŠEBEK, F.; KRZIKALLA, D. Monotonic Testing of 3D Printed SS316L under Multiaxial Loading. In Experimental Stress Analysis 2020. 2020. p. 213-224. ISBN: 978-80-248-4451-0.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT171100,
author="Michal {Kořínek} and Radim {Halama} and František {Fojtík} and Marek {Pagáč} and Jiří {Krček} and František {Šebek} and David {Krzikalla}",
title="Monotonic Testing of 3D Printed SS316L under Multiaxial Loading",
booktitle="Experimental Stress Analysis 2020",
year="2020",
pages="213--224",
isbn="978-80-248-4451-0"
}
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[nazev_en] => Monotonic Testing of 3D Printed SS316L under Multiaxial Loading
[popis_en] => The aim of this work was to monitor the behaviour of 316L stainless steel produced by 3D printing. The material was tested in the state “as printed”. Digital Image Correlation measurements were used for 4 types of notches. The behaviour of these notches under monotonic loading was investigated in two loading paths – tension and torsion. Based on experimental data, two material models were used in finite element analyses. Subsequently, the load-deformation responses of simulations and experiments were compared. Ductility of 3D printed specimens in “as printed” state is also compared with 3D printed machined samples and samples produced by conventional methods.
[klicova_slova_en] => Stainless steel S316L; 3D printing of metal; Multiaxial monotonic loading; Digital Image Correlation Method; Hill yield criterion; isotropic hardening; FEM simulation
[vysledek_datum] => 2020-10-19T00:00:00+02:00
)
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(
[vysledek_id] => 171255
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[nazev] => Crack propagation analysis in multilayer piezoelectric energy harvester
[nazev_orig] => Crack propagation analysis in multilayer piezoelectric energy harvester
[duvernost_udaju_id] => S
[popis] => In this work, a special multilayer piezoelectric cantilever energy harvester with active piezo-electric and protective ceramic layers is suggested and studied. Fracture mechanics behavior of such a layered structure is analyzed by means of the analytical model. Namely, the resistance of the structure to propagation of surface cracks upon harmonic vibrations is studied. The apparent fracture toughness of the laminate (which takes thermal residual stresses induced from processing into account) is calculated using the weight function method. The maximal allowable acceleration of the beam´s clamped end, which is applied upon a given forcing frequency and which warrants that the potential surface cracks will not propagate through the multilayer structure, is determined for a suggested configuration of the energy harvester.
[popis_orig] => In this work, a special multilayer piezoelectric cantilever energy harvester with active piezo-electric and protective ceramic layers is suggested and studied. Fracture mechanics behavior of such a layered structure is analyzed by means of the analytical model. Namely, the resistance of the structure to propagation of surface cracks upon harmonic vibrations is studied. The apparent fracture toughness of the laminate (which takes thermal residual stresses induced from processing into account) is calculated using the weight function method. The maximal allowable acceleration of the beam´s clamped end, which is applied upon a given forcing frequency and which warrants that the potential surface cracks will not propagate through the multilayer structure, is determined for a suggested configuration of the energy harvester.
[klicova_slova] => crack; piezoelectricity; energy harvester; multilayer structure; R-curve; weight function
[klicova_slova_orig] => crack; piezoelectricity; energy harvester; multilayer structure; R-curve; weight function
[url] => https://www.sciencedirect.com/science/article/pii/S2452321620302080
[oecd_obor_id] => 20302
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[odpovedny_utvar_nazev] => Ústav mechaniky těles, mechatroniky a biomechaniky
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[vycet_osob] => MACHŮ, Z.; MAJER, Z.; HADAŠ, Z.; ŠEVEČEK, O.
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[identifikator] => ISBN 9781713807575
[identifikator_popis] => ISBN - 9th International Conference on Materials Structure and Micromechanics of Fracture (MSMF9)
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[citace_text] => MACHŮ, Z.; MAJER, Z.; HADAŠ, Z.; ŠEVEČEK, O. Crack propagation analysis in multilayer piezoelectric energy harvester. In 9th International Conference on Materials Structure and Micromechanics of Fracture (MSMF9). Procedia Structural Integrity. 1. Brno: Elsevier B.V., 2019. p. 535-540. ISBN: 9781713807575. ISSN: 2452-3216.
[citace_html] => MACHŮ, Z.; MAJER, Z.; HADAŠ, Z.; ŠEVEČEK, O. Crack propagation analysis in multilayer piezoelectric energy harvester. In 9th International Conference on Materials Structure and Micromechanics of Fracture (MSMF9). Procedia Structural Integrity. 1. Brno: Elsevier B.V., 2019. p. 535-540. ISBN: 9781713807575. ISSN: 2452-3216.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT171255,
author="Zdeněk {Machů} and Zdeněk {Majer} and Zdeněk {Hadaš} and Oldřich {Ševeček}",
title="Crack propagation analysis in multilayer piezoelectric energy harvester",
booktitle="9th International Conference on Materials Structure and Micromechanics of Fracture (MSMF9)",
year="2019",
series="1",
journal="Procedia Structural Integrity",
volume="23",
number="1",
pages="535--540",
publisher="Elsevier B.V.",
address="Brno",
doi="10.1016/j.prostr.2020.01.141",
isbn="9781713807575",
url="https://www.sciencedirect.com/science/article/pii/S2452321620302080"
}
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[nazev_en] => Crack propagation analysis in multilayer piezoelectric energy harvester
[popis_en] => In this work, a special multilayer piezoelectric cantilever energy harvester with active piezo-electric and protective ceramic layers is suggested and studied. Fracture mechanics behavior of such a layered structure is analyzed by means of the analytical model. Namely, the resistance of the structure to propagation of surface cracks upon harmonic vibrations is studied. The apparent fracture toughness of the laminate (which takes thermal residual stresses induced from processing into account) is calculated using the weight function method. The maximal allowable acceleration of the beam´s clamped end, which is applied upon a given forcing frequency and which warrants that the potential surface cracks will not propagate through the multilayer structure, is determined for a suggested configuration of the energy harvester.
[klicova_slova_en] => crack; piezoelectricity; energy harvester; multilayer structure; R-curve; weight function
[vysledek_datum] => 2019-06-19T00:00:00+02:00
)
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(
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[nazev] => On the limits of finite element models created from (micro)CT datasets and used in studies of bone-implant-related biomechanical problems
[nazev_orig] => On the limits of finite element models created from (micro)CT datasets and used in studies of bone-implant-related biomechanical problems
[duvernost_udaju_id] => S
[popis] => Patient-specific approach is gaining a wide popularity in computational simulations of biomechanical systems. Simulations (most often based on the finite element method) are to date routinely created using data from imaging devices such as computed tomography which makes the models seemingly very complex and sophisticated. However, using a computed tomography in finite element calculations does not necessarily enhance the quality or even credibility of the models as these depend on the quality of the input images. Low-resolution (medical-)CT datasets do not always offer detailed representation of trabecular bone in FE models and thus might lead to incorrect calculation of mechanical response to external loading. The effect of image resolution on mechanical simulations of bone-implant interaction has not been thoroughly studied yet. In this study, the effect of image resolution on the modeling procedure and resulting mechanical strains in bone was analyzed on the example of cranial implant. For this purpose, several finite element models of bone interacting with fixationscrews were generated using seven computed tomography datasets of a bone specimen but with different image resolutions (ranging from micro-CT resolution of 25 ?m to medical-CT resolution of 1250 ?m). The comparative analysis revealed that FE models created from images of low resolution (obtained from medical computed tomography) can produce biased results. There are two main reasons: 1. Medical computed tomography images do not allow generating models with complex trabecular architecture which leads to substituting of the intertrabecular pores with a fictitious mass; 2. Image gray value distribution can be distorted resulting in incorrect mechanical properties of the bone and thus in unrealistic or even completely fictitious mechanical strains. The biased results of calculated mechanical strains can lead to incorrect conclusion, especially when bone-implant interaction is investigated. The image resolution was observed not to significantly affect stresses in the fixation screw itself; however, selection of bone material representation might result in significantly different stresses in the screw.
[popis_orig] => Patient-specific approach is gaining a wide popularity in computational simulations of biomechanical systems. Simulations (most often based on the finite element method) are to date routinely created using data from imaging devices such as computed tomography which makes the models seemingly very complex and sophisticated. However, using a computed tomography in finite element calculations does not necessarily enhance the quality or even credibility of the models as these depend on the quality of the input images. Low-resolution (medical-)CT datasets do not always offer detailed representation of trabecular bone in FE models and thus might lead to incorrect calculation of mechanical response to external loading. The effect of image resolution on mechanical simulations of bone-implant interaction has not been thoroughly studied yet. In this study, the effect of image resolution on the modeling procedure and resulting mechanical strains in bone was analyzed on the example of cranial implant. For this purpose, several finite element models of bone interacting with fixationscrews were generated using seven computed tomography datasets of a bone specimen but with different image resolutions (ranging from micro-CT resolution of 25 ?m to medical-CT resolution of 1250 ?m). The comparative analysis revealed that FE models created from images of low resolution (obtained from medical computed tomography) can produce biased results. There are two main reasons: 1. Medical computed tomography images do not allow generating models with complex trabecular architecture which leads to substituting of the intertrabecular pores with a fictitious mass; 2. Image gray value distribution can be distorted resulting in incorrect mechanical properties of the bone and thus in unrealistic or even completely fictitious mechanical strains. The biased results of calculated mechanical strains can lead to incorrect conclusion, especially when bone-implant interaction is investigated. The image resolution was observed not to significantly affect stresses in the fixation screw itself; however, selection of bone material representation might result in significantly different stresses in the screw.
[klicova_slova] => Finite element method; Computational modeling; Computed tomography; Image resolution; Bone tissue; Mechanical strain
[klicova_slova_orig] => Finite element method; Computational modeling; Computed tomography; Image resolution; Bone tissue; Mechanical strain
[url] => https://www.sciencedirect.com/science/article/pii/S1751616121000825
[oecd_obor_id] => 20601
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[odpovedny_utvar_nazev] => Ústav mechaniky těles, mechatroniky a biomechaniky
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[nadrazena_soucast_nazev] => Fakulta strojního inženýrství
[originalni_jazyk] => en
[schvalil_id] => 53543
[schvaleno] => 2021-04-20
[vykazovat_riv] => 1
[vykazovat_riv_zmeny] => 1
[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => MARCIÁN, P.; BORÁK, L.; ZIKMUND, T.; HORÁČKOVÁ, L.; KAISER, J.; JOUKAL, M.; WOLFF, J.
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[citace_text] => MARCIÁN, P.; BORÁK, L.; ZIKMUND, T.; HORÁČKOVÁ, L.; KAISER, J.; JOUKAL, M.; WOLFF, J. On the limits of finite element models created from (micro)CT datasets and used in studies of bone-implant-related biomechanical problems. Journal of the Mechanical Behavior of Biomedical Materials, 2021, vol. 117, no. 1, p. 104393-104393. ISSN: 1751-6161.
[citace_html] => MARCIÁN, P.; BORÁK, L.; ZIKMUND, T.; HORÁČKOVÁ, L.; KAISER, J.; JOUKAL, M.; WOLFF, J. On the limits of finite element models created from (micro)CT datasets and used in studies of bone-implant-related biomechanical problems. Journal of the Mechanical Behavior of Biomedical Materials, 2021, vol. 117, no. 1, p. 104393-104393. ISSN: 1751-6161.
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author="Petr {Marcián} and Libor {Borák} and Tomáš {Zikmund} and Ladislava {Horáčková} and Jozef {Kaiser} and Marek {Joukal} and Jan {Wolff}",
title="On the limits of finite element models created from (micro)CT datasets and used in studies of bone-implant-related biomechanical problems",
journal="Journal of the Mechanical Behavior of Biomedical Materials",
year="2021",
volume="117",
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doi="10.1016/j.jmbbm.2021.104393",
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[nazev_en] => On the limits of finite element models created from (micro)CT datasets and used in studies of bone-implant-related biomechanical problems
[popis_en] => Patient-specific approach is gaining a wide popularity in computational simulations of biomechanical systems. Simulations (most often based on the finite element method) are to date routinely created using data from imaging devices such as computed tomography which makes the models seemingly very complex and sophisticated. However, using a computed tomography in finite element calculations does not necessarily enhance the quality or even credibility of the models as these depend on the quality of the input images. Low-resolution (medical-)CT datasets do not always offer detailed representation of trabecular bone in FE models and thus might lead to incorrect calculation of mechanical response to external loading. The effect of image resolution on mechanical simulations of bone-implant interaction has not been thoroughly studied yet. In this study, the effect of image resolution on the modeling procedure and resulting mechanical strains in bone was analyzed on the example of cranial implant. For this purpose, several finite element models of bone interacting with fixationscrews were generated using seven computed tomography datasets of a bone specimen but with different image resolutions (ranging from micro-CT resolution of 25 ?m to medical-CT resolution of 1250 ?m). The comparative analysis revealed that FE models created from images of low resolution (obtained from medical computed tomography) can produce biased results. There are two main reasons: 1. Medical computed tomography images do not allow generating models with complex trabecular architecture which leads to substituting of the intertrabecular pores with a fictitious mass; 2. Image gray value distribution can be distorted resulting in incorrect mechanical properties of the bone and thus in unrealistic or even completely fictitious mechanical strains. The biased results of calculated mechanical strains can lead to incorrect conclusion, especially when bone-implant interaction is investigated. The image resolution was observed not to significantly affect stresses in the fixation screw itself; however, selection of bone material representation might result in significantly different stresses in the screw.
[klicova_slova_en] => Finite element method; Computational modeling; Computed tomography; Image resolution; Bone tissue; Mechanical strain
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[citace_text] => KOVÁŘ, J.; FUIS, V.; ČTVRTLÍK, R. Influencing of the Pile-Up and the Sink-In by the Coefficient of Friction in the Nanoindentation Test. In ENGINEERING MECHANICS 2020. Engineering Mechanics. Brno: 2020. no. 1, p. 298-301. ISSN: 1805-8248.
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[popis_en] => The influence of the coefficient of friction between an indenter and a specimen on the height of the pile-up or depth of the sink-in during the nanoindentation test is discussed in this paper. When the indenter is pressed into the hard material, the sink-in behavior causes the bending of the specimen's surface under the indenter. When the indenter is pressed into the soft material, the deformed material accumulates under the sides of the indenter and makes a pile-up region. The pile-up or sink-in behavior influences the contact area. In this paper, the finite element method was used for calculation of the dependency between the depth of the sink-in or height of the pile-up and the coefficient of friction. The results showed that while there is not any dependency between the friction and the depth of the sink-in, there is a strong dependency between the friction and the height of the pile-up until a specific value of the coefficient of friction. When the pile-up behavior occurs, the friction influences the contact area and should be included into the calculation of the contact area.
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[nazev_orig] => Development and experimental validation of self-powered wireless vibration sensor node using vibration energy harvester
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[popis] => This paper deals with development of a self-powered solution for wireless vibration sens -ing. An autonomous operation of the proposed vibration sensor node is based on an elec-tromagnetic energy harvesting device which converts kinetic energy of ambient mechanical vibration. Moreover, mechanical vibrations are monitored via electric signal from a piezoelectric patch and the measured signal is transmitted to the monitoring unit. The electromagnetic energy harvester is designed to provide enough power for a signal processing unit and a communication module, enabling the system to operate as a self-powered wireless vibration sensor node. Operation of this system was experimentally val-idated in laboratory environment and examples of vibration monitoring are presented. There is a significant restriction in terms of operation in resonance regime, where the gen-erated power of the kinetic energy harvester is maximal and sufficient for limitless opera-tion of the node. Main aim of this paper is to present a complex system which could be used in many engineering applications, such as aerospace, transportation, or civil structure monitoring. (c) 2021 Elsevier Ltd. All rights reserved.
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[klicova_slova] => Vibrations; Energy harvesting; Electromagnetic; Piezoelectric; MFC; Sensing; Wireless node
[klicova_slova_orig] => Vibrations; Energy harvesting; Electromagnetic; Piezoelectric; MFC; Sensing; Wireless node
[url] => https://www.sciencedirect.com/science/article/pii/S0888327021002855?via%3Dihub
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[nazev_en] => Development and experimental validation of self-powered wireless vibration sensor node using vibration energy harvester
[popis_en] => This paper deals with development of a self-powered solution for wireless vibration sens -ing. An autonomous operation of the proposed vibration sensor node is based on an elec-tromagnetic energy harvesting device which converts kinetic energy of ambient mechanical vibration. Moreover, mechanical vibrations are monitored via electric signal from a piezoelectric patch and the measured signal is transmitted to the monitoring unit. The electromagnetic energy harvester is designed to provide enough power for a signal processing unit and a communication module, enabling the system to operate as a self-powered wireless vibration sensor node. Operation of this system was experimentally val-idated in laboratory environment and examples of vibration monitoring are presented. There is a significant restriction in terms of operation in resonance regime, where the gen-erated power of the kinetic energy harvester is maximal and sufficient for limitless opera-tion of the node. Main aim of this paper is to present a complex system which could be used in many engineering applications, such as aerospace, transportation, or civil structure monitoring. (c) 2021 Elsevier Ltd. All rights reserved.
[klicova_slova_en] => Vibrations; Energy harvesting; Electromagnetic; Piezoelectric; MFC; Sensing; Wireless node
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[1] => Array
(
[quotations] => KŠICA, F.; HADAŠ, Z.; RUBEŠ, O.; BĚHAL, J.
[title] => Homogenized model of piezoelectric composite structure for sensing purposes
[typ] => PV
[year] => 2019
[id_vav] => 170205
)
[2] => Array
(
[quotations] => KONVALINKA, J.; FLORIAN, Z.; MARCIÁN, P.
[title] => The Influence of the Callus Shape and Level of Consolidation on Stress and Strain in Femur with Distraction Intramedullary Nail – FE Study
[typ] => PV
[year] => 2019
[id_vav] => 170230
)
[3] => Array
(
[quotations] => SLÁVIK, O.; HUTAŘ, P.; GOSCH, A.; BERER, M.; VOJTEK, T.; ARBEITER, F.; PINTER, G.; NÁHLÍK, L.
[title] => Fatigue crack propagation under mixed mode I and III in polyoxymethelene homopolymer
[typ] => PV
[year] => 2020
[id_vav] => 170329
)
[4] => Array
(
[quotations] => HADAŠ, Z.; PINČEK, L.
[title] => Electromagnetic rolling mass energy harvesting device for low frequency excitation
[typ] => PV
[year] => 2019
[id_vav] => 170367
)
[5] => Array
(
[quotations] => MACHŮ, Z.; KRATOCHVÍLOVÁ, M.; KŠICA, F.; PODROUŽEK, J.; HADAŠ, Z.
[title] => SENSING RAIL SYSTEM WITH PIEZOELECTRIC ELEMENTS
[typ] => PV
[year] => 2021
[id_vav] => 170368
)
[6] => Array
(
[quotations] => NÁHLÍK, L.; POKORNÝ, P.; FAJKOŠ, R.; HUTAŘ, P., ŠEVČÍK M., MATUŠEK P.
[title] => Fatigue lifetime estimation of railway axles
[typ] => PV
[year] => 2017
[id_vav] => 170578
)
[7] => Array
(
[quotations] => NÁHLÍK, L.; POKORNÝ, P.; ŠEVČÍK, M.; HUTAŘ, P.
[title] => Influence of Initial Inclined Surface Crack on Estimated Residual Fatigue Lifetime of Railway Axle
[typ] => PV
[year] => 2017
[id_vav] => 170579
)
[8] => Array
(
[quotations] => POKORNÝ, P.; NÁHLÍK, L.; HUTAŘ, P.
[title] => Influence of variable stress ratio during train operation on residual fatigue lifetime of railway axles
[typ] => PV
[year] => 2016
[id_vav] => 170580
)
[9] => Array
(
[quotations] => KRČMA, M.; ŠKAROUPKA, D.; VOSYNEK, P.; ZIKMUND, T.; KAISER, J.; PALOUŠEK, D.
[title] => Use of polymer concrete for large-scale 3D printing
[typ] => PV
[year] => 2021
[id_vav] => 170595
)
[10] => Array
(
[quotations] => KOŘÍNEK, M.; HALAMA, R.; FOJTÍK, F.; PAGÁČ, M.; KRČEK, J.; ŠEBEK, F.; KRZIKALLA, D.
[title] => Monotonic Testing of 3D Printed SS316L under Multiaxial Loading
[typ] => PV
[year] => 2020
[id_vav] => 171100
)
[11] => Array
(
[quotations] => MACHŮ, Z.; MAJER, Z.; HADAŠ, Z.; ŠEVEČEK, O.
[title] => Crack propagation analysis in multilayer piezoelectric energy harvester
[typ] => PV
[year] => 2019
[id_vav] => 171255
)
[12] => Array
(
[quotations] => MARCIÁN, P.; BORÁK, L.; ZIKMUND, T.; HORÁČKOVÁ, L.; KAISER, J.; JOUKAL, M.; WOLFF, J.
[title] => On the limits of finite element models created from (micro)CT datasets and used in studies of bone-implant-related biomechanical problems
[typ] => PV
[year] => 2021
[id_vav] => 171288
)
[13] => Array
(
[quotations] => KOVÁŘ, J.; FUIS, V.; ČTVRTLÍK, R.
[title] => Influencing of the Pile-Up and the Sink-In by the Coefficient of Friction in the Nanoindentation Test
[typ] => PV
[year] => 2020
[id_vav] => 172115
)
[14] => Array
(
[quotations] => RUBEŠ, O.; CHALUPA, J.; KŠICA, F.; HADAŠ, Z.
[title] => Development and experimental validation of self-powered wireless vibration sensor node using vibration energy harvester
[typ] => PV
[year] => 2021
[id_vav] => 172140
)
)
)