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[nazev] => Measured and Calculated Static Equilibrium Position of Water-Lubricated Tilting-Pad Journal Bearing
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results are validated with the measured data.
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[klicova_slova_orig] => tilting pad journal bearing; water lubricated; measurement; numerical analysis; static equilibrium
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[citace_text] => POKORNÝ, J.; NÁVRAT, T. Measured and Calculated Static Equilibrium Position of Water-Lubricated Tilting-Pad Journal Bearing. In Experimental stress analysis 2021, Book of full papers. First edition. Praha: Czech Technical University, 2021. p. 186-192. ISBN: 978-80-01-06885-4.
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booktitle="Experimental stress analysis 2021, Book of full papers",
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pages="186--192",
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based on the generalized Reynolds equation coupled with the 2D energy equation in the bearing midplane.
This model includes the lubricant mixing, deformation and tilting of the pads. The steady-state
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journal="Materials",
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[nazev] => Contactless Fault Detection of a DC Motor Direction of Rotation Using Its Stray Magnetic Field
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[popis] => In large-scale manufacturing and assembly applications, especially when trying to automate most steps, implementing quality control as early in the process as possible is the key to prevent expenses later. We deal mainly with the production of DC motor powered fuel pumps, which are commonly used in the automotive industry. The goal of this paper is to present a newly developed technique for non-invasive fault detection of a DC motor’s direction of rotation using a stray magnetic field out of the motor chassis. The results presented in this paper show that it is possible to detect faults even on low-power motors while the algorithm is kept as simple as possible to allow for large-scale deployment on a production line. It also gives new insight into the behavior of the stray magnetic field of electric motors, which may benefit other applications and future research.
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[klicova_slova] => fault detection; fault diagnosis; non-invasive; DC motor; direction of rotation; stray magnetic field; magnetic flux density; automation; fuel pump; automotive; manufacturing; quality control
[klicova_slova_orig] => fault detection; fault diagnosis; non-invasive; DC motor; direction of rotation; stray magnetic field; magnetic flux density; automation; fuel pump; automotive; manufacturing; quality control
[url] => https://www.mdpi.com/2075-1702/9/11/281
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[citace_text] => MATĚJÁSKO, M.; BRABLC, M.; APPEL, M.; GREPL, R. Contactless Fault Detection of a DC Motor Direction of Rotation Using Its Stray Magnetic Field. Machines, 2021, vol. 9, no. 11, p. 1-13. ISSN: 2075-1702.
[citace_html] => MATĚJÁSKO, M.; BRABLC, M.; APPEL, M.; GREPL, R. Contactless Fault Detection of a DC Motor Direction of Rotation Using Its Stray Magnetic Field. Machines, 2021, vol. 9, no. 11, p. 1-13. ISSN: 2075-1702.
[citace_rtf] =>
[citace_bibtex] => @article{BUT175189,
author="Michal {Matějásko} and Martin {Brablc} and Martin {Appel} and Robert {Grepl}",
title="Contactless Fault Detection of a DC Motor Direction of Rotation Using Its Stray Magnetic Field",
journal="Machines",
year="2021",
volume="9",
number="11",
pages="1--13",
doi="10.3390/machines9110281",
url="https://www.mdpi.com/2075-1702/9/11/281"
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[popis_en] => In large-scale manufacturing and assembly applications, especially when trying to automate most steps, implementing quality control as early in the process as possible is the key to prevent expenses later. We deal mainly with the production of DC motor powered fuel pumps, which are commonly used in the automotive industry. The goal of this paper is to present a newly developed technique for non-invasive fault detection of a DC motor’s direction of rotation using a stray magnetic field out of the motor chassis. The results presented in this paper show that it is possible to detect faults even on low-power motors while the algorithm is kept as simple as possible to allow for large-scale deployment on a production line. It also gives new insight into the behavior of the stray magnetic field of electric motors, which may benefit other applications and future research.
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[nazev] => Constitutive models and failure properties of fibrous tissues of carotid artery atheroma based on their uniaxial testing
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[popis] => To obtain an experimental background for the description of mechanical properties of fibrous tissues of carotid atheroma, a cohort of 141 specimens harvested from 44 patients during endarterectomies, were tested. Uniaxial stress-strain curves and ultimate stress and strain at rupture were recorded. With this cohort, the impact of the direction of load, presence of calcifications, specimen location, patient's age and sex were investigated. A significant impact of sex was revealed for the stress-strain curves and ultimate strains. The response was significantly stiffer for females than for males but, in contrast to ultimate strain, the strength was not significantly different. The differences in strength between calcified and non-calcified atheromas have reached statistical significance in the female group. At most of the analysed stress levels, the loading direction was found significant for the male cohort which was also confirmed by large differences in ultimate strains. The representative uniaxial stress-strain curves (given by median values of strains at chosen stress levels) were fitted with an isotropic hyperelastic model for different groups specified by the investigated factors while the observed differences between circumferential and longitudinal direction were captured by an anisotropic hyperelastic model. The obtained results should be valid also for the tissue of the fibrous cap, the rupture of which is to be predicted in clinics using computational modelling because it may induce arterial thrombosis and consequently a brain stroke.
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[klicova_slova] => Atherosclerosis; Carotid artery; Fibrous tissue; Strength; Uniaxial tension
[klicova_slova_orig] => Atherosclerosis; Carotid artery; Fibrous tissue; Strength; Uniaxial tension
[url] => https://www.sciencedirect.com/science/article/pii/S0021929021006187
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[citace_text] => LISICKÝ, O.; HRUBANOVÁ, A.; STAFFA, R.; VLACHOVSKÝ, R.; BURŠA, J. Constitutive models and failure properties of fibrous tissues of carotid artery atheroma based on their uniaxial testing. JOURNAL OF BIOMECHANICS, 2021, vol. 129, no. 1, p. 110861-1 (110861-8 p.)ISSN: 0021-9290.
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[nazev_en] => Constitutive models and failure properties of fibrous tissues of carotid artery atheroma based on their uniaxial testing
[popis_en] => To obtain an experimental background for the description of mechanical properties of fibrous tissues of carotid atheroma, a cohort of 141 specimens harvested from 44 patients during endarterectomies, were tested. Uniaxial stress-strain curves and ultimate stress and strain at rupture were recorded. With this cohort, the impact of the direction of load, presence of calcifications, specimen location, patient's age and sex were investigated. A significant impact of sex was revealed for the stress-strain curves and ultimate strains. The response was significantly stiffer for females than for males but, in contrast to ultimate strain, the strength was not significantly different. The differences in strength between calcified and non-calcified atheromas have reached statistical significance in the female group. At most of the analysed stress levels, the loading direction was found significant for the male cohort which was also confirmed by large differences in ultimate strains. The representative uniaxial stress-strain curves (given by median values of strains at chosen stress levels) were fitted with an isotropic hyperelastic model for different groups specified by the investigated factors while the observed differences between circumferential and longitudinal direction were captured by an anisotropic hyperelastic model. The obtained results should be valid also for the tissue of the fibrous cap, the rupture of which is to be predicted in clinics using computational modelling because it may induce arterial thrombosis and consequently a brain stroke.
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[nazev] => Numerical simulation of sound propagation around human head during phonation
[nazev_orig] => Numerical simulation of sound propagation around human head during phonation
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[popis] => The paper presents a 3D finite element (FE) model of propagation of acoustic waves from vocal folds through the vocal tract and around human head during speech production. Computer tomography (CT) images taken during phonation of the subject were used to create geometrical model of the acoustic spaces corresponding to the human vocal tract and the acoustic spaces around the human head. Modal and harmonic analyses (harmonic excitation at the position of the vocal folds) were used for determination of the resonant characteristics of the FE model. The results of numerical simulations are in good agreement with the experimental data known from literature. The developed model allows evaluating acoustic pressures at any point inside the vocal tract and in the space around the head and can be used for analysis of the sound field around the human head during speech production.
[popis_orig] => The paper presents a 3D finite element (FE) model of propagation of acoustic waves from vocal folds through the vocal tract and around human head during speech production. Computer tomography (CT) images taken during phonation of the subject were used to create geometrical model of the acoustic spaces corresponding to the human vocal tract and the acoustic spaces around the human head. Modal and harmonic analyses (harmonic excitation at the position of the vocal folds) were used for determination of the resonant characteristics of the FE model. The results of numerical simulations are in good agreement with the experimental data known from literature. The developed model allows evaluating acoustic pressures at any point inside the vocal tract and in the space around the head and can be used for analysis of the sound field around the human head during speech production.
[klicova_slova] => biomechanics of voice, finite element method, simulation of phonation
[klicova_slova_orig] => biomechanics of voice, finite element method, simulation of phonation
[url] => https://iiav.org/content/archives_icsv_last/2021_icsv27/content/papers/papers/full_paper_714_20210430181403381.pdf
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[citace_text] => ŠVANCARA, P.; HÁJEK, P.; HORÁČEK, J.; ŠVEC, J. Numerical simulation of sound propagation around human head during phonation. In Proceedings of the 27th International Congress on Sound and Vibration. International Journal of Acoustic and Vibration. Silesian University Press, Gliwice, Poland, 2021. p. 172047-172047. ISBN: 978-83-7880-799-5. ISSN: 2329-3675.
[citace_html] => ŠVANCARA, P.; HÁJEK, P.; HORÁČEK, J.; ŠVEC, J. Numerical simulation of sound propagation around human head during phonation. In Proceedings of the 27th International Congress on Sound and Vibration. International Journal of Acoustic and Vibration. Silesian University Press, Gliwice, Poland, 2021. p. 172047-172047. ISBN: 978-83-7880-799-5. ISSN: 2329-3675.
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author="Pavel {Švancara} and Petr {Hájek} and Jaromír {Horáček} and Jan G. {Švec}",
title="Numerical simulation of sound propagation around human head during phonation",
booktitle="Proceedings of the 27th International Congress on Sound and Vibration",
year="2021",
journal="International Journal of Acoustic and Vibration",
pages="172047--172047",
publisher="Silesian University Press, Gliwice, Poland",
isbn="978-83-7880-799-5",
issn="2329-3675",
url="https://iiav.org/content/archives_icsv_last/2021_icsv27/content/papers/papers/full_paper_714_20210430181403381.pdf"
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[nazev_en] => Numerical simulation of sound propagation around human head during phonation
[popis_en] => The paper presents a 3D finite element (FE) model of propagation of acoustic waves from vocal folds through the vocal tract and around human head during speech production. Computer tomography (CT) images taken during phonation of the subject were used to create geometrical model of the acoustic spaces corresponding to the human vocal tract and the acoustic spaces around the human head. Modal and harmonic analyses (harmonic excitation at the position of the vocal folds) were used for determination of the resonant characteristics of the FE model. The results of numerical simulations are in good agreement with the experimental data known from literature. The developed model allows evaluating acoustic pressures at any point inside the vocal tract and in the space around the head and can be used for analysis of the sound field around the human head during speech production.
[klicova_slova_en] => biomechanics of voice, finite element method, simulation of phonation
[vysledek_datum] => 2021-07-11T00:00:00+02:00
)
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(
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[nazev] => 27th International Congress on Sound and Vibration
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[popis_orig] =>
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[url] => https://www.icsv27.org/
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[odpovedny_utvar_nazev] => Ústav mechaniky těles, mechatroniky a biomechaniky
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[originalni_jazyk] => en
[schvalil_id] => 3157
[schvaleno] => 2022-02-18
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[citace_text] => 27th International Congress on Sound and Vibration. Virtual,online (11.07.2021)
[citace_html] => 27th International Congress on Sound and Vibration. Virtual,online (11.07.2021)
[citace_rtf] =>
[citace_bibtex] => @misc{BUT175567,
title="27th International Congress on Sound and Vibration",
year="2021",
url="https://www.icsv27.org/",
note="Holding a conference"
}
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[nazev_en] => 27th International Congress on Sound and Vibration
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[klicova_slova_en] =>
[vysledek_datum] => 2021-07-11T00:00:00+02:00
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[nazev] => Finite-element modeling of vocal fold self-oscillations in interaction with vocal tract: Comparison of incompressible and compressible flow model
[nazev_orig] => Finite-element modeling of vocal fold self-oscillations in interaction with vocal tract: Comparison of incompressible and compressible flow model
[duvernost_udaju_id] => S
[popis] => Finite-element modeling of self-sustained vocal fold oscillations during voice production has mostly considered the air as incompressible, due to numerical complexity. This study overcomes this limitation and studies the influence of air compressibility on phonatory pressures, flow and vocal fold vibratory characteristics. A two-dimensional finite-element model is used, which incorporates layered vocal fold structure, vocal fold collisions, large deformations of the vocal fold tissue, morphing the fluid mesh according to the vocal fold motion by the arbitrary Lagrangian-Eulerian approach and vocal tract model of Czech vowel [i:] based on data from magnetic resonance images. Unsteady viscous compressible or incompressible airflow is described by the Navier-Stokes equations. An explicit coupling scheme with separated solvers for structure and fluid domain was used for modeling the fluid-structure-acoustic interaction. Results of the simulations show clear differences in the glottal flow and vocal fold vibration waveforms between the incompressible and compressible fluid flow. These results provide the evidence on the existence of the coupling between the vocal tract acoustics and the glottal flow (Level 1 interactions), as well as between the vocal tract acoustics and the vocal fold vibrations (Level 2 interactions).
[popis_orig] => Finite-element modeling of self-sustained vocal fold oscillations during voice production has mostly considered the air as incompressible, due to numerical complexity. This study overcomes this limitation and studies the influence of air compressibility on phonatory pressures, flow and vocal fold vibratory characteristics. A two-dimensional finite-element model is used, which incorporates layered vocal fold structure, vocal fold collisions, large deformations of the vocal fold tissue, morphing the fluid mesh according to the vocal fold motion by the arbitrary Lagrangian-Eulerian approach and vocal tract model of Czech vowel [i:] based on data from magnetic resonance images. Unsteady viscous compressible or incompressible airflow is described by the Navier-Stokes equations. An explicit coupling scheme with separated solvers for structure and fluid domain was used for modeling the fluid-structure-acoustic interaction. Results of the simulations show clear differences in the glottal flow and vocal fold vibration waveforms between the incompressible and compressible fluid flow. These results provide the evidence on the existence of the coupling between the vocal tract acoustics and the glottal flow (Level 1 interactions), as well as between the vocal tract acoustics and the vocal fold vibrations (Level 2 interactions).
[klicova_slova] => biomechanics of voice; compressible flow; finite element method; fluid-structure-acoustic interaction; simulation of phonation
[klicova_slova_orig] => biomechanics of voice; compressible flow; finite element method; fluid-structure-acoustic interaction; simulation of phonation
[url] => https://www.kme.zcu.cz/acm/acm/article/view/672
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[schvaleno] => 2022-03-22
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[vycet_osob] => HÁJEK, P.; ŠVANCARA, P.; HORÁČEK, J.; ŠVEC, J.
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[kod_doi] => 10.24132/acm.2021.672
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[kategorie_nazev] => Publikační výsledky
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[druh_popis] => Článek v odborném periodiku je obsažen v databázi SCOPUS společnosti Elsevier s příznakem „Article“, „Review“ nebo „Letter“
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[identifikator] => ISSN 1802-680X
[identifikator_popis] => ISSN - Applied andComputational Mechanics (CZ)
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[citace_text] => HÁJEK, P.; ŠVANCARA, P.; HORÁČEK, J.; ŠVEC, J. Finite-element modeling of vocal fold self-oscillations in interaction with vocal tract: Comparison of incompressible and compressible flow model. Applied andComputational Mechanics, 2021, vol. 15, no. 2, p. 133-152. ISSN: 1802-680X.
[citace_html] => HÁJEK, P.; ŠVANCARA, P.; HORÁČEK, J.; ŠVEC, J. Finite-element modeling of vocal fold self-oscillations in interaction with vocal tract: Comparison of incompressible and compressible flow model. Applied andComputational Mechanics, 2021, vol. 15, no. 2, p. 133-152. ISSN: 1802-680X.
[citace_rtf] =>
[citace_bibtex] => @article{BUT175617,
author="Petr {Hájek} and Pavel {Švancara} and Jaromír {Horáček} and Jan G. {Švec}",
title="Finite-element modeling of vocal fold self-oscillations in interaction with vocal tract: Comparison of incompressible and compressible flow model",
journal="Applied andComputational Mechanics",
year="2021",
volume="15",
number="2",
pages="133--152",
doi="10.24132/acm.2021.672",
issn="1802-680X",
url="https://www.kme.zcu.cz/acm/acm/article/view/672"
}
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[poznamka_metriky] =>
[nazev_en] => Finite-element modeling of vocal fold self-oscillations in interaction with vocal tract: Comparison of incompressible and compressible flow model
[popis_en] => Finite-element modeling of self-sustained vocal fold oscillations during voice production has mostly considered the air as incompressible, due to numerical complexity. This study overcomes this limitation and studies the influence of air compressibility on phonatory pressures, flow and vocal fold vibratory characteristics. A two-dimensional finite-element model is used, which incorporates layered vocal fold structure, vocal fold collisions, large deformations of the vocal fold tissue, morphing the fluid mesh according to the vocal fold motion by the arbitrary Lagrangian-Eulerian approach and vocal tract model of Czech vowel [i:] based on data from magnetic resonance images. Unsteady viscous compressible or incompressible airflow is described by the Navier-Stokes equations. An explicit coupling scheme with separated solvers for structure and fluid domain was used for modeling the fluid-structure-acoustic interaction. Results of the simulations show clear differences in the glottal flow and vocal fold vibration waveforms between the incompressible and compressible fluid flow. These results provide the evidence on the existence of the coupling between the vocal tract acoustics and the glottal flow (Level 1 interactions), as well as between the vocal tract acoustics and the vocal fold vibrations (Level 2 interactions).
[klicova_slova_en] => biomechanics of voice; compressible flow; finite element method; fluid-structure-acoustic interaction; simulation of phonation
[vysledek_datum] => 2021-07-08T00:00:00+02:00
)
[8] => Array
(
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[nazev] => Verifikovaný postup minimalizace zbytkových napětí vibrační metodou s využitím počítačové simulace
[nazev_orig] => Verifikovaný postup minimalizace zbytkových napětí vibrační metodou s využitím počítačové simulace
[duvernost_udaju_id] => C
[popis] => Navržená technologie umožňuje dopředu simulovat zamýšlené vibrační snižování zbytkového napětí rozměrných svařenců. Podle simulačních výsledků pak lze rozhodnout, zda v daných souvislostech má nasazení vibrační technologie smysl, případně v jakém rozsahu a při jakém frekvenčním buzení lze očekávat požadovaný efekt.
[popis_orig] => Navržená technologie umožňuje dopředu simulovat zamýšlené vibrační snižování zbytkového napětí rozměrných svařenců. Podle simulačních výsledků pak lze rozhodnout, zda v daných souvislostech má nasazení vibrační technologie smysl, případně v jakém rozsahu a při jakém frekvenčním buzení lze očekávat požadovaný efekt.
[klicova_slova] => Minimalizace zbytkových napětí; vibrační metoda; svařované konstrukce
[klicova_slova_orig] => Minimalizace zbytkových napětí; vibrační metoda; svařované konstrukce
[url] =>
[oecd_obor_id] => 20302
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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] => cs
[schvalil_id] => 107598
[schvaleno] => 2022-02-01
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[vycet_osob] => PETRUŠKA, J.; HOUFEK, L.; VOSYNEK, P.; FORMÁNEK, M.
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[znamka] =>
[kategorie_nazev] => Aplikované výsledky
[druh_nazev] => Ověřená technologie
[druh_popis] => Ověřená technologie
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[riv_dodavka_id] => 2942
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[citace_text] => PETRUŠKA, J.; HOUFEK, L.; VOSYNEK, P.; FORMÁNEK, M.: Verifikovaný postup minimalizace zbytkových napětí vibrační metodou s využitím počítačové simulace. (Ověřená technologie)
[citace_html] => PETRUŠKA, J.; HOUFEK, L.; VOSYNEK, P.; FORMÁNEK, M.: Verifikovaný postup minimalizace zbytkových napětí vibrační metodou s využitím počítačové simulace. (Ověřená technologie)
[citace_rtf] =>
[citace_bibtex] => @misc{BUT176153,
author="Jindřich {Petruška} and Lubomír {Houfek} and Petr {Vosynek} and Michael {Formánek}",
title="Verifikovaný postup minimalizace zbytkových napětí vibrační metodou s využitím počítačové simulace",
year="2021",
note="Verified technology"
}
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[poznamka_metriky] =>
[nazev_en] => Verified methodology of computer aided residual stress relief by vibration
[popis_en] => Suggested technology is focused to computational simulation of intended vibration stress relief of large welded structures. The results help to decide if the vibration technology makes sense in the actual situation and if so, to which extent and under which conditions the successful results can be awaited.
[klicova_slova_en] => Residual stress minimization; vibration method; welded structures
[vysledek_datum] => 2021-12-31T00:00:00+01:00
)
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[nazev] => Impact of physiological loads of arterial wall on nucleus deformation in endothelial cells: A computational study
[nazev_orig] => Impact of physiological loads of arterial wall on nucleus deformation in endothelial cells: A computational study
[duvernost_udaju_id] => S
[popis] => Introduction: Computational modeling can enhance the understanding of cell mechanics. To achieve this, finite element models of endothelial cells were proposed with shapes mimicking their natural state inside the endothelium within the cardiovascular system. Implementing the recently proposed bendo-tensegrity concept, these models consider flexural (buckling) as well as tensional/compressional behavior of microtubules and also incorporate the waviness of intermediate filaments.
Materials and methods: Four different models were created (flat and domed hexagons, both regular and elongated in the direction of blood flow) and loaded by biaxial deformation, blood pressure, and shear load from blood flow - natural physiological conditions of the arterial endothelium - aiming to investigate the "in situ" mechanical response of the cell.
Results: The impact of individual components of loads on the nucleus deformation (more specifically on the first principal strain) potentially influencing mechanotransduction was investigated and the role of the cytoskeleton and its constituents in the mechanical response of the endothelial cell was assessed. The results show (i) the impact of pulsating blood pressure on cyclic deformations of the nucleus, which increase substantially with decreasing axial pre-stretch of the cell, (ii) the importance of relatively low shear stresses in the cell response and nucleus deformation.
Conclusion: Not only the pulsatile blood pressure but also the wall shear stress may induce significant deformation of the nucleus and thus trigger remodelation processes in endothelial cells.
[popis_orig] => Introduction: Computational modeling can enhance the understanding of cell mechanics. To achieve this, finite element models of endothelial cells were proposed with shapes mimicking their natural state inside the endothelium within the cardiovascular system. Implementing the recently proposed bendo-tensegrity concept, these models consider flexural (buckling) as well as tensional/compressional behavior of microtubules and also incorporate the waviness of intermediate filaments.
Materials and methods: Four different models were created (flat and domed hexagons, both regular and elongated in the direction of blood flow) and loaded by biaxial deformation, blood pressure, and shear load from blood flow - natural physiological conditions of the arterial endothelium - aiming to investigate the "in situ" mechanical response of the cell.
Results: The impact of individual components of loads on the nucleus deformation (more specifically on the first principal strain) potentially influencing mechanotransduction was investigated and the role of the cytoskeleton and its constituents in the mechanical response of the endothelial cell was assessed. The results show (i) the impact of pulsating blood pressure on cyclic deformations of the nucleus, which increase substantially with decreasing axial pre-stretch of the cell, (ii) the importance of relatively low shear stresses in the cell response and nucleus deformation.
Conclusion: Not only the pulsatile blood pressure but also the wall shear stress may induce significant deformation of the nucleus and thus trigger remodelation processes in endothelial cells.
[klicova_slova] => Cell mechanics; Biaxial load; Finite element model; Bendo-tensegrity; Shear load
[klicova_slova_orig] => Cell mechanics; Biaxial load; Finite element model; Bendo-tensegrity; Shear load
[url] => https://www.sciencedirect.com/science/article/pii/S0010482522000580
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[kod_doi] => 10.1016/j.compbiomed.2022.105266
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[citace_text] => JAKKA, V.; BURŠA, J. Impact of physiological loads of arterial wall on nucleus deformation in endothelial cells: A computational study. Computers in Biology and Medicine, 2022, vol. 143, no. 143, p. 105266-1 (105266-11 p.)ISSN: 0010-4825.
[citace_html] => JAKKA, V.; BURŠA, J. Impact of physiological loads of arterial wall on nucleus deformation in endothelial cells: A computational study. Computers in Biology and Medicine, 2022, vol. 143, no. 143, p. 105266-1 (105266-11 p.)ISSN: 0010-4825.
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[nazev_en] => Impact of physiological loads of arterial wall on nucleus deformation in endothelial cells: A computational study
[popis_en] => Introduction: Computational modeling can enhance the understanding of cell mechanics. To achieve this, finite element models of endothelial cells were proposed with shapes mimicking their natural state inside the endothelium within the cardiovascular system. Implementing the recently proposed bendo-tensegrity concept, these models consider flexural (buckling) as well as tensional/compressional behavior of microtubules and also incorporate the waviness of intermediate filaments.
Materials and methods: Four different models were created (flat and domed hexagons, both regular and elongated in the direction of blood flow) and loaded by biaxial deformation, blood pressure, and shear load from blood flow - natural physiological conditions of the arterial endothelium - aiming to investigate the "in situ" mechanical response of the cell.
Results: The impact of individual components of loads on the nucleus deformation (more specifically on the first principal strain) potentially influencing mechanotransduction was investigated and the role of the cytoskeleton and its constituents in the mechanical response of the endothelial cell was assessed. The results show (i) the impact of pulsating blood pressure on cyclic deformations of the nucleus, which increase substantially with decreasing axial pre-stretch of the cell, (ii) the importance of relatively low shear stresses in the cell response and nucleus deformation.
Conclusion: Not only the pulsatile blood pressure but also the wall shear stress may induce significant deformation of the nucleus and thus trigger remodelation processes in endothelial cells.
[klicova_slova_en] => Cell mechanics; Biaxial load; Finite element model; Bendo-tensegrity; Shear load
[vysledek_datum] => 2022-01-24T00:00:00+01:00
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(
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[nazev] => Cyclic plasticity models and fatigue criteria for exhaust manifold life assessment in the context of limited material data available
[nazev_orig] => Cyclic plasticity models and fatigue criteria for exhaust manifold life assessment in the context of limited material data available
[duvernost_udaju_id] => S
[popis] => The work focuses on predictive capabilities of fundamental cyclic plasticity and fatigue life models, which can be calibrated using limited amount of experiments as specific ones needed for more advanced models are often absent. The analyses are conducted for the synthetic case of exhaust manifold made from cast iron. The thermal boundary conditions from the forced convection were obtained from the computational fluid dynamics considered as a conjugate heat transfer problem. Two rate-independent and temperature-dependent material models were calibrated for structural analyses. Both were validated with experiments on isothermal and anisothermal levels. Sequential thermal–mechanical finite element simulations were performed. Two fatigue life models were employed. The first was a temperature-dependent strain-based fatigue life criterion calibrated from uniaxial data. The second was a temperature-independent energy-based fatigue life criterion resulting in twice lower life than the strain-based criterion, while none of the plasticity models made a significant difference in that prediction.
[popis_orig] => The work focuses on predictive capabilities of fundamental cyclic plasticity and fatigue life models, which can be calibrated using limited amount of experiments as specific ones needed for more advanced models are often absent. The analyses are conducted for the synthetic case of exhaust manifold made from cast iron. The thermal boundary conditions from the forced convection were obtained from the computational fluid dynamics considered as a conjugate heat transfer problem. Two rate-independent and temperature-dependent material models were calibrated for structural analyses. Both were validated with experiments on isothermal and anisothermal levels. Sequential thermal–mechanical finite element simulations were performed. Two fatigue life models were employed. The first was a temperature-dependent strain-based fatigue life criterion calibrated from uniaxial data. The second was a temperature-independent energy-based fatigue life criterion resulting in twice lower life than the strain-based criterion, while none of the plasticity models made a significant difference in that prediction.
[klicova_slova] => Automotive; crack location; damage; failure; low-cycle fatigue
[klicova_slova_orig] => Automotive; crack location; damage; failure; low-cycle fatigue
[url] => https://www.tandfonline.com/doi/full/10.1080/09603409.2021.2013615
[oecd_obor_id] => 20501
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[nadrazena_soucast_nazev] => Fakulta strojního inženýrství
[originalni_jazyk] => en
[schvalil_id] => 107598
[schvaleno] => 2022-02-07
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[vycet_osob] => KOŠŤÁL, J.; ŠEBEK, F.; PETRUŠKA, J.; SEIFERT, T.
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[citace_text] => KOŠŤÁL, J.; ŠEBEK, F.; PETRUŠKA, J.; SEIFERT, T. Cyclic plasticity models and fatigue criteria for exhaust manifold life assessment in the context of limited material data available. Materials at high temperatures, 2022, vol. 39, no. 1, p. 68-85. ISSN: 0960-3409.
[citace_html] => KOŠŤÁL, J.; ŠEBEK, F.; PETRUŠKA, J.; SEIFERT, T. Cyclic plasticity models and fatigue criteria for exhaust manifold life assessment in the context of limited material data available. Materials at high temperatures, 2022, vol. 39, no. 1, p. 68-85. ISSN: 0960-3409.
[citace_rtf] =>
[citace_bibtex] => @article{BUT176397,
author="Josef {Košťál} and František {Šebek} and Jindřich {Petruška} and Thomas {Seifert}",
title="Cyclic plasticity models and fatigue criteria for exhaust manifold life assessment in the context of limited material data available",
journal="Materials at high temperatures",
year="2022",
volume="39",
number="1",
pages="68--85",
doi="10.1080/09603409.2021.2013615",
issn="0960-3409",
url="https://www.tandfonline.com/doi/full/10.1080/09603409.2021.2013615"
}
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[nazev_en] => Cyclic plasticity models and fatigue criteria for exhaust manifold life assessment in the context of limited material data available
[popis_en] => The work focuses on predictive capabilities of fundamental cyclic plasticity and fatigue life models, which can be calibrated using limited amount of experiments as specific ones needed for more advanced models are often absent. The analyses are conducted for the synthetic case of exhaust manifold made from cast iron. The thermal boundary conditions from the forced convection were obtained from the computational fluid dynamics considered as a conjugate heat transfer problem. Two rate-independent and temperature-dependent material models were calibrated for structural analyses. Both were validated with experiments on isothermal and anisothermal levels. Sequential thermal–mechanical finite element simulations were performed. Two fatigue life models were employed. The first was a temperature-dependent strain-based fatigue life criterion calibrated from uniaxial data. The second was a temperature-independent energy-based fatigue life criterion resulting in twice lower life than the strain-based criterion, while none of the plasticity models made a significant difference in that prediction.
[klicova_slova_en] => Automotive; crack location; damage; failure; low-cycle fatigue
[vysledek_datum] => 2022-01-01T00:00:00+01:00
)
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(
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[nazev] => Resolving measurement of large (similar to GDa) chemical/biomolecule complexes with multimode nanomechanical resonators
[nazev_orig] => Resolving measurement of large (similar to GDa) chemical/biomolecule complexes with multimode nanomechanical resonators
[duvernost_udaju_id] => S
[popis] => Mass sensing by nanomechanical resonators can be routinely performed for analytes of mass ranging from kDa to tens of MDa. Measurement of the heavier analytes (up to hundreds of GDa) that are relevant to viruses, and many biological and chemical complexes, still remains one of the main challenges to be solved. Some studies propose the heavy analyte identification by accounting for its mass, stiffness and binding effects. However, the necessity of using the sophisticated computational tools complicates their widespread use in the nanomechanical mass spectrometry. Here, we report on the heavy analyte mass spectrometry (similar to GDa) using the multimode nanomechanical resonators, which is directly applicable to analytes of arbitrary mass, stiffness and dimensions. This identification, based on the simultaneous measurement of the multiple by analyte induced resonant frequency shifts, only requires the analyte to resonator mass ratio between 0.001 and 0.02. We show that the analyte stiffness and binding effects must be considered for the lower mass ratios (< 0.001), while for the higher mass ratios (> 0.02) the inaccuracies in determined mass are independent of both the analyte stiffness and binding effects, and increase with the mass of analyte. Validity of present results have been demonstrated by comparing predictions with the recent experimental measurements performed on the micro-/nanomechanical resonator-based mass spectrometers. Our findings, together with the provided software, which enables an easily accessible determination of the effects of analyte properties on the frequency response, present a novel paradigm in a design of the nanomechanical resonators for mass sensing in GDa range.
[popis_orig] => Mass sensing by nanomechanical resonators can be routinely performed for analytes of mass ranging from kDa to tens of MDa. Measurement of the heavier analytes (up to hundreds of GDa) that are relevant to viruses, and many biological and chemical complexes, still remains one of the main challenges to be solved. Some studies propose the heavy analyte identification by accounting for its mass, stiffness and binding effects. However, the necessity of using the sophisticated computational tools complicates their widespread use in the nanomechanical mass spectrometry. Here, we report on the heavy analyte mass spectrometry (similar to GDa) using the multimode nanomechanical resonators, which is directly applicable to analytes of arbitrary mass, stiffness and dimensions. This identification, based on the simultaneous measurement of the multiple by analyte induced resonant frequency shifts, only requires the analyte to resonator mass ratio between 0.001 and 0.02. We show that the analyte stiffness and binding effects must be considered for the lower mass ratios (< 0.001), while for the higher mass ratios (> 0.02) the inaccuracies in determined mass are independent of both the analyte stiffness and binding effects, and increase with the mass of analyte. Validity of present results have been demonstrated by comparing predictions with the recent experimental measurements performed on the micro-/nanomechanical resonator-based mass spectrometers. Our findings, together with the provided software, which enables an easily accessible determination of the effects of analyte properties on the frequency response, present a novel paradigm in a design of the nanomechanical resonators for mass sensing in GDa range.
[klicova_slova] => Mass sensing; Mass spectrometry; Nanomechanical resonators; Molecule identification; Heavy mass (similar to GDa) spectrometry
[klicova_slova_orig] => Mass sensing; Mass spectrometry; Nanomechanical resonators; Molecule identification; Heavy mass (similar to GDa) spectrometry
[url] => https://www.sciencedirect.com/science/article/pii/S0925400521016300?via%3Dihub
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[nadrazena_soucast_nazev] => Fakulta strojního inženýrství
[originalni_jazyk] => en
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[schvaleno] => 2022-03-29
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[vycet_osob] => STACHIV, I.; MACHŮ, Z.; ŠEVEČEK, O.; TUHOVČÁK, O.; KOTOUL, M.; JENG, Y.
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[stav] => Schválený
[vysledek_kategorie_id] => PV
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[citace_text] => STACHIV, I.; MACHŮ, Z.; ŠEVEČEK, O.; TUHOVČÁK, O.; KOTOUL, M.; JENG, Y. Resolving measurement of large (similar to GDa) chemical/biomolecule complexes with multimode nanomechanical resonators. SENSORS AND ACTUATORS B-CHEMICAL, 2022, vol. 353, no. 15, p. 1-9. ISSN: 0925-4005.
[citace_html] => STACHIV, I.; MACHŮ, Z.; ŠEVEČEK, O.; TUHOVČÁK, O.; KOTOUL, M.; JENG, Y. Resolving measurement of large (similar to GDa) chemical/biomolecule complexes with multimode nanomechanical resonators. SENSORS AND ACTUATORS B-CHEMICAL, 2022, vol. 353, no. 15, p. 1-9. ISSN: 0925-4005.
[citace_rtf] =>
[citace_bibtex] => @article{BUT176781,
author="Ivo {Stachiv} and Zdeněk {Machů} and Oldřich {Ševeček} and Ondřej {Tuhovčák} and Michal {Kotoul} and Yeau-Ren {Jeng}",
title="Resolving measurement of large (similar to GDa) chemical/biomolecule complexes with multimode nanomechanical resonators",
journal="SENSORS AND ACTUATORS B-CHEMICAL",
year="2022",
volume="353",
number="15",
pages="1--9",
doi="10.1016/j.snb.2021.131062",
url="https://www.sciencedirect.com/science/article/pii/S0925400521016300?via%3Dihub"
}
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[poznamka_metriky] =>
[nazev_en] => Resolving measurement of large (similar to GDa) chemical/biomolecule complexes with multimode nanomechanical resonators
[popis_en] => Mass sensing by nanomechanical resonators can be routinely performed for analytes of mass ranging from kDa to tens of MDa. Measurement of the heavier analytes (up to hundreds of GDa) that are relevant to viruses, and many biological and chemical complexes, still remains one of the main challenges to be solved. Some studies propose the heavy analyte identification by accounting for its mass, stiffness and binding effects. However, the necessity of using the sophisticated computational tools complicates their widespread use in the nanomechanical mass spectrometry. Here, we report on the heavy analyte mass spectrometry (similar to GDa) using the multimode nanomechanical resonators, which is directly applicable to analytes of arbitrary mass, stiffness and dimensions. This identification, based on the simultaneous measurement of the multiple by analyte induced resonant frequency shifts, only requires the analyte to resonator mass ratio between 0.001 and 0.02. We show that the analyte stiffness and binding effects must be considered for the lower mass ratios (< 0.001), while for the higher mass ratios (> 0.02) the inaccuracies in determined mass are independent of both the analyte stiffness and binding effects, and increase with the mass of analyte. Validity of present results have been demonstrated by comparing predictions with the recent experimental measurements performed on the micro-/nanomechanical resonator-based mass spectrometers. Our findings, together with the provided software, which enables an easily accessible determination of the effects of analyte properties on the frequency response, present a novel paradigm in a design of the nanomechanical resonators for mass sensing in GDa range.
[klicova_slova_en] => Mass sensing; Mass spectrometry; Nanomechanical resonators; Molecule identification; Heavy mass (similar to GDa) spectrometry
[vysledek_datum] => 2022-02-15T00:00:00+01:00
)
[12] => Array
(
[vysledek_id] => 177130
[vysledek_druh_id] => ARTSC
[ex_vysledek_id] => 143948
[vysledek_rok] => 2020
[nazev] => Numerical simulations of semi-elliptical fatigue crack propagation
[nazev_orig] => Numerical simulations of semi-elliptical fatigue crack propagation
[duvernost_udaju_id] => S
[popis] => Residual fatigue lifetime assessment of a cracked structure is a common task for engineering and scientific community. Fatigue crack may appear on the surface or in the initial defect, e.g. pores in weldments. Such a structure needs to be examined, whether is it safe to be operated. Various assessment methods of different difficulties exist. In this paper, numerical and experimental study on fatigue crack propagation is presented. Propagation of a fatigue crack starting from an initial surface defect of semi-elliptical shape through the flat specimen is considered. Two load ratios were employed in order to compare their effects, as loading at low asymmetry R = 0.1 ensures presence of a plasticity induced crack closure, while at load ratio R = 0.6 fatigue crack growth without premature closure is expected. Beach marks were created on the fracture surface in order to study the fatigue crack evolution, number of cycles spent for fatigue growth and also the influence of premature closure on the crack front evolution. One of the well-known methods was applied for numerical fatigue lifetime evaluation and estimated number of cycles required for crack growth through the body was compared to the experimentally measured data. Second part of the paper deals with fatigue crack front curvature, which is always affected at the vicinity of the free surface due to the corner singularity of the stress field. However, when crack closure appears, fatigue crack propagation is retarded and furthermore, crack front is curved even more at the free surface as a result of earlier closure than in the middle of the body. Separation of these two effects allows direct comparison of their impact on fatigue crack front propagation.
[popis_orig] => Residual fatigue lifetime assessment of a cracked structure is a common task for engineering and scientific community. Fatigue crack may appear on the surface or in the initial defect, e.g. pores in weldments. Such a structure needs to be examined, whether is it safe to be operated. Various assessment methods of different difficulties exist. In this paper, numerical and experimental study on fatigue crack propagation is presented. Propagation of a fatigue crack starting from an initial surface defect of semi-elliptical shape through the flat specimen is considered. Two load ratios were employed in order to compare their effects, as loading at low asymmetry R = 0.1 ensures presence of a plasticity induced crack closure, while at load ratio R = 0.6 fatigue crack growth without premature closure is expected. Beach marks were created on the fracture surface in order to study the fatigue crack evolution, number of cycles spent for fatigue growth and also the influence of premature closure on the crack front evolution. One of the well-known methods was applied for numerical fatigue lifetime evaluation and estimated number of cycles required for crack growth through the body was compared to the experimentally measured data. Second part of the paper deals with fatigue crack front curvature, which is always affected at the vicinity of the free surface due to the corner singularity of the stress field. However, when crack closure appears, fatigue crack propagation is retarded and furthermore, crack front is curved even more at the free surface as a result of earlier closure than in the middle of the body. Separation of these two effects allows direct comparison of their impact on fatigue crack front propagation.
[klicova_slova] => fatigue lifetime assessment, fatigue crack propagation, plasticity induced crack closure
[klicova_slova_orig] => fatigue lifetime assessment, fatigue crack propagation, plasticity induced crack closure
[url] => https://aip.scitation.org/doi/pdf/10.1063/5.0035558
[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] => 3218
[schvaleno] => 2022-03-11
[vykazovat_riv] => 1
[vykazovat_riv_zmeny] => 1
[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => HUTAŘ, P.; OPLT, T.; JAMBOR, M.; NÁHLÍK, L.
[pocet_tvurcu] => 4
[tvurci_ids] =>
[poznamka] =>
[typ_nazev] =>
[kod_doi] => 10.1063/5.0035558
[kod_dspace] =>
[rok_vytvoreni] =>
[pocet_zaznamu] =>
[zverejneno] => 1
[prvni_autor] =>
[korespondencni_autor] =>
[posledni_autor] =>
[znamka] =>
[kategorie_nazev] => Publikační výsledky
[druh_nazev] => Článek Scopus
[druh_popis] => Článek v odborném periodiku je obsažen v databázi SCOPUS společnosti Elsevier s příznakem „Article“, „Review“ nebo „Letter“
[stav] => Schválený
[vysledek_kategorie_id] => PV
[vysledek_system_kategorie_id] => PU
[vysledek_stav_id] => 3
[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
[ins_uid] => 999999
[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISSN 0094-243X
[identifikator_popis] => ISSN - AIP conference proceedings (US)
[riv_dodavka_id] => 2920
[riv_dodavka_oznaceni] => RIV22-MSM-26210___
[riv_dodavka_rok] => 2022
[diagnostika_pocet] => 0
[diagnostika_pocet_chyba] => 0
[diagnostika_pocet_upozorneni] => 0
[diagnostika_pocet_informace] => 0
[citace_text] => HUTAŘ, P.; OPLT, T.; JAMBOR, M.; NÁHLÍK, L. Numerical simulations of semi-elliptical fatigue crack propagation. AIP conference proceedings, 2020, vol. 2309, no. -, p. 1-14. ISSN: 0094-243X.
[citace_html] => HUTAŘ, P.; OPLT, T.; JAMBOR, M.; NÁHLÍK, L. Numerical simulations of semi-elliptical fatigue crack propagation. AIP conference proceedings, 2020, vol. 2309, no. -, p. 1-14. ISSN: 0094-243X.
[citace_rtf] =>
[citace_bibtex] => @article{BUT177130,
author="Tomáš {Oplt} and Michal {Jambor} and Luboš {Náhlík} and Pavel {Hutař}",
title="Numerical simulations of semi-elliptical fatigue crack propagation",
journal="AIP conference proceedings",
year="2020",
volume="2309",
number="-",
pages="1--14",
doi="10.1063/5.0035558",
issn="0094-243X",
url="https://aip.scitation.org/doi/pdf/10.1063/5.0035558"
}
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[oecd_tree_obor_nazev] => 2.3 Mechanical engineering
[oecd_tree_podobor_id] => 20301
[oecd_tree_podobor_nazev] => Mechanical engineering
[poznamka_metriky] =>
[nazev_en] => Numerical simulations of semi-elliptical fatigue crack propagation
[popis_en] => Residual fatigue lifetime assessment of a cracked structure is a common task for engineering and scientific community. Fatigue crack may appear on the surface or in the initial defect, e.g. pores in weldments. Such a structure needs to be examined, whether is it safe to be operated. Various assessment methods of different difficulties exist. In this paper, numerical and experimental study on fatigue crack propagation is presented. Propagation of a fatigue crack starting from an initial surface defect of semi-elliptical shape through the flat specimen is considered. Two load ratios were employed in order to compare their effects, as loading at low asymmetry R = 0.1 ensures presence of a plasticity induced crack closure, while at load ratio R = 0.6 fatigue crack growth without premature closure is expected. Beach marks were created on the fracture surface in order to study the fatigue crack evolution, number of cycles spent for fatigue growth and also the influence of premature closure on the crack front evolution. One of the well-known methods was applied for numerical fatigue lifetime evaluation and estimated number of cycles required for crack growth through the body was compared to the experimentally measured data. Second part of the paper deals with fatigue crack front curvature, which is always affected at the vicinity of the free surface due to the corner singularity of the stress field. However, when crack closure appears, fatigue crack propagation is retarded and furthermore, crack front is curved even more at the free surface as a result of earlier closure than in the middle of the body. Separation of these two effects allows direct comparison of their impact on fatigue crack front propagation.
[klicova_slova_en] => fatigue lifetime assessment, fatigue crack propagation, plasticity induced crack closure
[vysledek_datum] => 2020-11-26T00:00:00+01:00
)
[13] => Array
(
[vysledek_id] => 177131
[vysledek_druh_id] => ARTSC
[ex_vysledek_id] => 143949
[vysledek_rok] => 2020
[nazev] => Numerical evaluation of plasticity induced crack closure in 3D structures
[nazev_orig] => Numerical evaluation of plasticity induced crack closure in 3D structures
[duvernost_udaju_id] => S
[popis] => Fatigue growth of the crack may be retarded as a consequence of the fatigue crack closure occurrence. Complete understanding of the closure process and ability of its accurate assessment is in best interest of scientific and engineering community. In this paper, three-dimensional numerical model of M(T) specimen with straight crack front was created and subjected to loading at various load ratios from R = -1 to R = 0.1. Settings of input parameters such as element size, length of the crack growth, number of substeps and contact elements were adopted from two-dimensional analyses. Closure levels were determined by the method of first node behind the crack tip displacement monitoring. Closure level determination was performed locally for each node along the crack front, respecting the distribution of the stress intensity factor. Results were compared to experimental results and discussion on the reasons of fatigue crack front curvature was provided.
[popis_orig] => Fatigue growth of the crack may be retarded as a consequence of the fatigue crack closure occurrence. Complete understanding of the closure process and ability of its accurate assessment is in best interest of scientific and engineering community. In this paper, three-dimensional numerical model of M(T) specimen with straight crack front was created and subjected to loading at various load ratios from R = -1 to R = 0.1. Settings of input parameters such as element size, length of the crack growth, number of substeps and contact elements were adopted from two-dimensional analyses. Closure levels were determined by the method of first node behind the crack tip displacement monitoring. Closure level determination was performed locally for each node along the crack front, respecting the distribution of the stress intensity factor. Results were compared to experimental results and discussion on the reasons of fatigue crack front curvature was provided.
[klicova_slova] => Crack front curvature; Fatigue crack propagation; Finite element analysis; Plasticity induced crack closure
[klicova_slova_orig] => Crack front curvature; Fatigue crack propagation; Finite element analysis; Plasticity induced crack closure
[url] => https://www.sciencedirect.com/science/article/pii/S2452321620301293
[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] => 3218
[schvaleno] => 2022-03-11
[vykazovat_riv] => 1
[vykazovat_riv_zmeny] => 1
[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => OPLT, T.; HUTAŘ, P.; POKORNÝ, P.; NÁHLÍK, L.; BERTO, F.
[pocet_tvurcu] => 5
[tvurci_ids] =>
[poznamka] =>
[typ_nazev] =>
[kod_doi] => 10.1016/j.prostr.2020.01.070
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[pocet_zaznamu] =>
[zverejneno] => 1
[prvni_autor] =>
[korespondencni_autor] =>
[posledni_autor] =>
[znamka] =>
[kategorie_nazev] => Publikační výsledky
[druh_nazev] => Článek Scopus
[druh_popis] => Článek v odborném periodiku je obsažen v databázi SCOPUS společnosti Elsevier s příznakem „Article“, „Review“ nebo „Letter“
[stav] => Schválený
[vysledek_kategorie_id] => PV
[vysledek_system_kategorie_id] => PU
[vysledek_stav_id] => 3
[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
[ins_uid] => 999999
[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] =>
[identifikator_popis] =>
[riv_dodavka_id] => 2920
[riv_dodavka_oznaceni] => RIV22-MSM-26210___
[riv_dodavka_rok] => 2022
[diagnostika_pocet] => 0
[diagnostika_pocet_chyba] => 0
[diagnostika_pocet_upozorneni] => 0
[diagnostika_pocet_informace] => 0
[citace_text] => OPLT, T.; HUTAŘ, P.; POKORNÝ, P.; NÁHLÍK, L.; BERTO, F. Numerical evaluation of plasticity induced crack closure in 3D structures. Procedia Structural Integrity, 2020, vol. 23, no. -, p. 101-106. ISSN: 2452-3216.
[citace_html] => OPLT, T.; HUTAŘ, P.; POKORNÝ, P.; NÁHLÍK, L.; BERTO, F. Numerical evaluation of plasticity induced crack closure in 3D structures. Procedia Structural Integrity, 2020, vol. 23, no. -, p. 101-106. ISSN: 2452-3216.
[citace_rtf] =>
[citace_bibtex] => @article{BUT177131,
author="Tomáš {Oplt} and Pavel {Hutař} and Pavel {Pokorný} and Luboš {Náhlík} and Filippo {Berto}",
title="Numerical evaluation of plasticity induced crack closure in 3D structures",
journal="Procedia Structural Integrity",
year="2020",
volume="23",
number="-",
pages="101--106",
doi="10.1016/j.prostr.2020.01.070",
url="https://www.sciencedirect.com/science/article/pii/S2452321620301293"
}
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[oecd_tree_podobor_id] => 20301
[oecd_tree_podobor_nazev] => Mechanical engineering
[poznamka_metriky] =>
[nazev_en] => Numerical evaluation of plasticity induced crack closure in 3D structures
[popis_en] => Fatigue growth of the crack may be retarded as a consequence of the fatigue crack closure occurrence. Complete understanding of the closure process and ability of its accurate assessment is in best interest of scientific and engineering community. In this paper, three-dimensional numerical model of M(T) specimen with straight crack front was created and subjected to loading at various load ratios from R = -1 to R = 0.1. Settings of input parameters such as element size, length of the crack growth, number of substeps and contact elements were adopted from two-dimensional analyses. Closure levels were determined by the method of first node behind the crack tip displacement monitoring. Closure level determination was performed locally for each node along the crack front, respecting the distribution of the stress intensity factor. Results were compared to experimental results and discussion on the reasons of fatigue crack front curvature was provided.
[klicova_slova_en] => Crack front curvature; Fatigue crack propagation; Finite element analysis; Plasticity induced crack closure
[vysledek_datum] => 2020-02-19T00:00:00+01:00
)
[14] => Array
(
[vysledek_id] => 177132
[vysledek_druh_id] => ARTSC
[ex_vysledek_id] => 143950
[vysledek_rok] => 2016
[nazev] => Influence of extension of load spectrum on estimation of residual fatigue lifetime of railway axle
[nazev_orig] => Influence of extension of load spectrum on estimation of residual fatigue lifetime of railway axle
[duvernost_udaju_id] => S
[popis] => Railway axles are subjected to cyclic amplitude loading which can lead to fatigue failure. For safe operation of railway axles a damage tolerance approach taking into account a possible defect in railway axle is often required. Because of different operation regimes of trains (fast/slow ride, ride on straight track, on curved track, over switches etc.) the load amplitude of axle is not constant. The variability of load is defined by a load spectrum, which is determined experimentally by measuring of load in service conditions. Even though the load spectrum is measured on several hundreds or thousands of operation kilometres, the railway axles are in operation much longer time (often tens of years). Therefore, some load amplitudes higher than ones measured in the test can occur during a long-term axle service. The contribution presented deals with the effect of extension of load spectrum by rare high load amplitudes, which can occur during long-term operation, on residual fatigue lifetime of railway axles.
[popis_orig] => Railway axles are subjected to cyclic amplitude loading which can lead to fatigue failure. For safe operation of railway axles a damage tolerance approach taking into account a possible defect in railway axle is often required. Because of different operation regimes of trains (fast/slow ride, ride on straight track, on curved track, over switches etc.) the load amplitude of axle is not constant. The variability of load is defined by a load spectrum, which is determined experimentally by measuring of load in service conditions. Even though the load spectrum is measured on several hundreds or thousands of operation kilometres, the railway axles are in operation much longer time (often tens of years). Therefore, some load amplitudes higher than ones measured in the test can occur during a long-term axle service. The contribution presented deals with the effect of extension of load spectrum by rare high load amplitudes, which can occur during long-term operation, on residual fatigue lifetime of railway axles.
[klicova_slova] => Fatigue crack; Load spectrum; Overload; Railway axle
[klicova_slova_orig] => Fatigue crack; Load spectrum; Overload; Railway axle
[url] => https://www.scientific.net/SSP.258.607
[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] => 3218
[schvaleno] => 2022-03-11
[vykazovat_riv] => 1
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[kod_doi] => 10.4028/www.scientific.net/SSP.258.607
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[zverejneno] => 1
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[posledni_autor] =>
[znamka] =>
[kategorie_nazev] => Publikační výsledky
[druh_nazev] => Článek Scopus
[druh_popis] => Článek v odborném periodiku je obsažen v databázi SCOPUS společnosti Elsevier s příznakem „Article“, „Review“ nebo „Letter“
[stav] => Schválený
[vysledek_kategorie_id] => PV
[vysledek_system_kategorie_id] => PU
[vysledek_stav_id] => 3
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[upravil] => Informační systém Automat
[ins_uid] => 999999
[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISSN 1012-0394
[identifikator_popis] => ISSN - Solid State Phenomena (CH)
[riv_dodavka_id] => 2920
[riv_dodavka_oznaceni] => RIV22-MSM-26210___
[riv_dodavka_rok] => 2022
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[diagnostika_pocet_chyba] => 0
[diagnostika_pocet_upozorneni] => 0
[diagnostika_pocet_informace] => 0
[citace_text] => POKORNÝ, P.; HUTAŘ, P.; NÁHLÍK, L. Influence of extension of load spectrum on estimation of residual fatigue lifetime of railway axle. Solid State Phenomena, 2016, vol. 258, no. -, p. 607-610. ISSN: 1012-0394.
[citace_html] => POKORNÝ, P.; HUTAŘ, P.; NÁHLÍK, L. Influence of extension of load spectrum on estimation of residual fatigue lifetime of railway axle. Solid State Phenomena, 2016, vol. 258, no. -, p. 607-610. ISSN: 1012-0394.
[citace_rtf] =>
[citace_bibtex] => @article{BUT177132,
author="Pavel {Pokorný} and Pavel {Hutař} and Luboš {Náhlík}",
title="Influence of extension of load spectrum on estimation of residual fatigue lifetime of railway axle",
journal="Solid State Phenomena",
year="2016",
volume="258",
number="-",
pages="607--610",
doi="10.4028/www.scientific.net/SSP.258.607",
issn="1012-0394",
url="https://www.scientific.net/SSP.258.607"
}
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[oecd_tree_oblast_nazev] => 2. Engineering and Technology
[oecd_tree_obor_id] => 20300
[oecd_tree_obor_nazev] => 2.3 Mechanical engineering
[oecd_tree_podobor_id] => 20301
[oecd_tree_podobor_nazev] => Mechanical engineering
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[nazev_en] => Influence of extension of load spectrum on estimation of residual fatigue lifetime of railway axle
[popis_en] => Railway axles are subjected to cyclic amplitude loading which can lead to fatigue failure. For safe operation of railway axles a damage tolerance approach taking into account a possible defect in railway axle is often required. Because of different operation regimes of trains (fast/slow ride, ride on straight track, on curved track, over switches etc.) the load amplitude of axle is not constant. The variability of load is defined by a load spectrum, which is determined experimentally by measuring of load in service conditions. Even though the load spectrum is measured on several hundreds or thousands of operation kilometres, the railway axles are in operation much longer time (often tens of years). Therefore, some load amplitudes higher than ones measured in the test can occur during a long-term axle service. The contribution presented deals with the effect of extension of load spectrum by rare high load amplitudes, which can occur during long-term operation, on residual fatigue lifetime of railway axles.
[klicova_slova_en] => Fatigue crack; Load spectrum; Overload; Railway axle
[vysledek_datum] => 2016-12-01T00:00:00+01:00
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[title] => Measured and Calculated Static Equilibrium Position of Water-Lubricated Tilting-Pad Journal Bearing
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[title] => Determination of Mechanical and Fracture Properties of Silicon Single Crystal from Indentation Experiments and Finite Element Modelling
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