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[nazev] => Measured and Calculated Static Equilibrium Position of Water-Lubricated Tilting-Pad Journal Bearing
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[popis] => This paper deals with the measurement and computational modelling of the static equilibrium
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carried out on a developed test rig with two bearing housings. A computational model is presented
based on the generalized Reynolds equation coupled with the 2D energy equation in the bearing midplane.
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bearing, the Anderson method with bounds is implemented. Results of the equilibrium position in
dependence on the journal speed are given for a particular water-lubricated journal bearing. These
results are validated with the measured data.
[klicova_slova] => 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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author="Jan {Pokorný} and Tomáš {Návrat}",
title="Measured and Calculated Static Equilibrium Position of Water-Lubricated Tilting-Pad Journal Bearing",
booktitle="Experimental stress analysis 2021, Book of full papers",
year="2021",
series="First edition",
pages="186--192",
publisher="Czech Technical University",
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position of the hydrodynamic water-lubricated tilting-pad journal bearing. The measurement is
carried out on a developed test rig with two bearing housings. A computational model is presented
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
solution is reached using the finite volume method. To find the static equilibrium position of the
bearing, the Anderson method with bounds is implemented. Results of the equilibrium position in
dependence on the journal speed are given for a particular water-lubricated journal bearing. These
results are validated with the measured data.
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[nazev] => Determination of Mechanical and Fracture Properties of Silicon Single Crystal from Indentation Experiments and Finite Element Modelling
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[citace_text] => SKALKA, P.; KOTOUL, M. Determination of Mechanical and Fracture Properties of Silicon Single Crystal from Indentation Experiments and Finite Element Modelling. Materials, 2021, vol. 14, no. 22, p. 1-15. ISSN: 1996-1944.
[citace_html] => SKALKA, P.; KOTOUL, M. Determination of Mechanical and Fracture Properties of Silicon Single Crystal from Indentation Experiments and Finite Element Modelling. Materials, 2021, vol. 14, no. 22, p. 1-15. ISSN: 1996-1944.
[citace_rtf] =>
[citace_bibtex] => @article{BUT173211,
author="Petr {Skalka} and Michal {Kotoul}",
title="Determination of Mechanical and Fracture Properties of Silicon Single Crystal from Indentation Experiments and Finite Element Modelling",
journal="Materials",
year="2021",
volume="14",
number="22",
pages="1--15",
doi="10.3390/ma14226864",
url="https://www.mdpi.com/1996-1944/14/22/6864"
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[popis] => A novel method for semiautomated assessment of directions of collagen fibers in soft tissues using histological image analysis is presented. It is based on multiple rotated images obtained via polarized light microscopy without any additional components, i.e., with just two polarizers being either perpendicular or nonperpendicular (rotated). This arrangement breaks the limitation of 90° periodicity of polarized light intensity and evaluates the in-plane fiber orientation over the whole 180° range accurately and quickly. After having verified the method, we used histological specimens of porcine Achilles tendon and aorta to validate the proposed algorithm and to lower the number of rotated images needed for evaluation. Our algorithm is capable to analyze 5·105 pixels in one micrograph in a few seconds and is thus a powerful and cheap tool promising a broad application in detection of collagen fiber distribution in soft tissues.
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[klicova_slova] => soft tissue; histological slice; collagen; fiber direction; polarized light microscopy; histogram
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[citace_text] => TURČANOVÁ, M.; HRTOŇ, M.; DVOŘÁK, P.; NOVÁK, K.; HERMANOVÁ, M.; BEDNAŘÍK, Z.; POLZER, S.; BURŠA, J. Full-Range Optical Imaging of Planar Collagen Fiber Orientation Using Polarized Light Microscopy. Biomed Research International, 2021, vol. 2021, no. 1, p. 1-13. ISSN: 2314-6141.
[citace_html] => TURČANOVÁ, M.; HRTOŇ, M.; DVOŘÁK, P.; NOVÁK, K.; HERMANOVÁ, M.; BEDNAŘÍK, Z.; POLZER, S.; BURŠA, J. Full-Range Optical Imaging of Planar Collagen Fiber Orientation Using Polarized Light Microscopy. Biomed Research International, 2021, vol. 2021, no. 1, p. 1-13. ISSN: 2314-6141.
[citace_rtf] =>
[citace_bibtex] => @article{BUT175037,
author="Michaela {Turčanová} and Martin {Hrtoň} and Petr {Viewegh} and Kamil {Novák} and Markéta {Hermanová} and Zdeněk {Bednařík} and Stanislav {Polzer} and Jiří {Burša}",
title="Full-Range Optical Imaging of Planar Collagen Fiber Orientation Using Polarized Light Microscopy",
journal="Biomed Research International",
year="2021",
volume="2021",
number="1",
pages="1--13",
doi="10.1155/2021/6879765",
issn="2314-6133",
url="https://www.hindawi.com/journals/bmri/2021/6879765/"
}
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[nazev_en] => Full-Range Optical Imaging of Planar Collagen Fiber Orientation Using Polarized Light Microscopy
[popis_en] => A novel method for semiautomated assessment of directions of collagen fibers in soft tissues using histological image analysis is presented. It is based on multiple rotated images obtained via polarized light microscopy without any additional components, i.e., with just two polarizers being either perpendicular or nonperpendicular (rotated). This arrangement breaks the limitation of 90° periodicity of polarized light intensity and evaluates the in-plane fiber orientation over the whole 180° range accurately and quickly. After having verified the method, we used histological specimens of porcine Achilles tendon and aorta to validate the proposed algorithm and to lower the number of rotated images needed for evaluation. Our algorithm is capable to analyze 5·105 pixels in one micrograph in a few seconds and is thus a powerful and cheap tool promising a broad application in detection of collagen fiber distribution in soft tissues.
[klicova_slova_en] => soft tissue; histological slice; collagen; fiber direction; polarized light microscopy; histogram
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[duvernost_udaju_id] => S
[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] =>
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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.
[klicova_slova_en] => fault detection; fault diagnosis; non-invasive; DC motor; direction of rotation; stray magnetic field; magnetic flux density; automation; fuel pump; automotive; manufacturing; quality control
[vysledek_datum] => 2021-11-10T00:00:00+01:00
)
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[nazev] => Constitutive models and failure properties of fibrous tissues of carotid artery atheroma based on their uniaxial testing
[nazev_orig] => Constitutive models and failure properties of fibrous tissues of carotid artery atheroma based on their uniaxial testing
[duvernost_udaju_id] => S
[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.
[popis_orig] => 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.
[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.
[klicova_slova_en] => Atherosclerosis; Carotid artery; Fibrous tissue; Strength; Uniaxial tension
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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
[duvernost_udaju_id] => S
[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.
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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.
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[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).
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title="Finite-element modeling of vocal fold self-oscillations in interaction with vocal tract: Comparison of incompressible and compressible flow model",
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title="Verifikovaný postup minimalizace zbytkových napětí vibrační metodou s využitím počítačové simulace",
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[oecd_tree_podobor_nazev] => Applied mechanics
[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
)
[10] => Array
(
[vysledek_id] => 176231
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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
[oecd_obor_id] => 10602
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[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
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[nadrazena_soucast_id] => 4
[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
[schvalil_id] => 182495
[schvaleno] => 2023-01-23
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[vykazovat_riv_zmeny] => 1
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[vycet_osob] => JAKKA, V.; BURŠA, J.
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[kod_doi] => 10.1016/j.compbiomed.2022.105266
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[upd_ts] => 2025-09-22
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[identifikator_popis] => ISSN - Computers in Biology and Medicine (US)
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[riv_dodavka_oznaceni] => RIV23-MSM-26210___
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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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[oecd_tree_podobor_nazev] => Biology (theoretical, mathematical, thermal, cryobiology, biological rhythm), Evolutionary biology
[poznamka_metriky] =>
[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
)
[11] => Array
(
[vysledek_id] => 176397
[vysledek_druh_id] => ARTWOS
[ex_vysledek_id] => 143355
[vysledek_rok] => 2022
[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
[odpovedny_utvar_id] => 157
[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
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[nadrazena_soucast_id] => 4
[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
[schvalil_id] => 107598
[schvaleno] => 2022-02-07
[vykazovat_riv] => 1
[vykazovat_riv_zmeny] => 1
[slozka_id] =>
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[vycet_osob] => KOŠŤÁL, J.; ŠEBEK, F.; PETRUŠKA, J.; SEIFERT, T.
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[identifikator_popis] => ISSN - Materials at high temperatures (GB)
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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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[poznamka_metriky] =>
[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
)
[12] => Array
(
[vysledek_id] => 176781
[vysledek_druh_id] => ARTWOS
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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
[oecd_obor_id] => 21101
[odpovedny_utvar_id] => 157
[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
[odpovedny_utvar_zkratka] => ISMMB
[nadrazena_soucast_id] => 4
[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
[schvalil_id] => 17485
[schvaleno] => 2022-03-29
[vykazovat_riv] => 1
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[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => STACHIV, I.; MACHŮ, Z.; ŠEVEČEK, O.; TUHOVČÁK, O.; KOTOUL, M.; JENG, Y.
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[upravil] => Informační systém Automat
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[upd_ts] => 2025-09-22
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[identifikator_popis] =>
[riv_dodavka_id] => 2903
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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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[oecd_tree_podobor_nazev] => Food and beverages
[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
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[nazev] => TIME-DOMAIN SIMULATIONS OF GROOVING PROCESS WITH STIFFNESS UNCERTANTITIES
[nazev_orig] => TIME-DOMAIN SIMULATIONS OF GROOVING PROCESS WITH STIFFNESS UNCERTANTITIES
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[popis] => In the world of nonlinear dynamics, it is necessary to consider the fact that a small change of input parameter can cause large changes in results. However, several methods deal with uncertainty. This paper compares two methods for uncertainty analysis, polynomial chaos expansion, and Monte Carlo method. The analysis was performed on the structure of the machine tool slide. The two main components - linear roller guideway with preload and linear ball screw, they both present with the nonlinear characteristic. The stiffness of these components is dependent on the deformation as well as the direction of load. The results of both methods match reasonably in a stable condition. For the unstable machining should be surrogated model improve for further analysis. The main advantage of PCE is a shorter computation time in contrast to time-consuming MC. This approach enables not only the stimulation of the machining process in local conditions but in the future, it might be also extended for the analysis of machine tool stability in the full condition range.
[popis_orig] => In the world of nonlinear dynamics, it is necessary to consider the fact that a small change of input parameter can cause large changes in results. However, several methods deal with uncertainty. This paper compares two methods for uncertainty analysis, polynomial chaos expansion, and Monte Carlo method. The analysis was performed on the structure of the machine tool slide. The two main components - linear roller guideway with preload and linear ball screw, they both present with the nonlinear characteristic. The stiffness of these components is dependent on the deformation as well as the direction of load. The results of both methods match reasonably in a stable condition. For the unstable machining should be surrogated model improve for further analysis. The main advantage of PCE is a shorter computation time in contrast to time-consuming MC. This approach enables not only the stimulation of the machining process in local conditions but in the future, it might be also extended for the analysis of machine tool stability in the full condition range.
[klicova_slova] => Polynomial chaos expansion; Monte Carlo; Turning model; Uncertainty analysis; Nonlinear stiffness
[klicova_slova_orig] => Polynomial chaos expansion; Monte Carlo; Turning model; Uncertainty analysis; Nonlinear stiffness
[url] => https://www.engmech.cz/im/proceedings/show_p/2020/178
[oecd_obor_id] => 20301
[odpovedny_utvar_id] => 162
[odpovedny_utvar_nazev] => Dept. of Mechatronics
[odpovedny_utvar_zkratka] => ISMMB DM
[nadrazena_soucast_id] => 4
[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
[schvalil_id] => 11599
[schvaleno] => 2022-03-08
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[vycet_osob] => HADRABA, P.; SVOBODOVÁ, M.; LIN, H.; HADAŠ, Z.
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[kod_doi] => 10.21495/5896-3-178
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[druh_popis] => Paper in proceedings (conference paper)
[stav] => Approved
[vysledek_kategorie_id] => PV
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[ins_uid] => 999999
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[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISBN 978-80-214-5896-3 ISSN 1805-8256
[identifikator_popis] => ISBN - ENGINEERING MECHANICS 2020 ISSN - Engineering Mechanics .... (CZ)
[riv_dodavka_id] => 2920
[riv_dodavka_oznaceni] => RIV22-MSM-26210___
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[citace_text] => HADRABA, P.; SVOBODOVÁ, M.; LIN, H.; HADAŠ, Z. TIME-DOMAIN SIMULATIONS OF GROOVING PROCESS WITH STIFFNESS UNCERTANTITIES. In ENGINEERING MECHANICS 2020. Engineering Mechanics .... BRNO: BRNO UNIV TECHNOL, FAC MECHANICAL ENGINEERING, 2020. no. 2020, p. 178-181. ISBN: 978-80-214-5896-3. ISSN: 1805-8256.
[citace_html] => HADRABA, P.; SVOBODOVÁ, M.; LIN, H.; HADAŠ, Z. TIME-DOMAIN SIMULATIONS OF GROOVING PROCESS WITH STIFFNESS UNCERTANTITIES. In ENGINEERING MECHANICS 2020. Engineering Mechanics .... BRNO: BRNO UNIV TECHNOL, FAC MECHANICAL ENGINEERING, 2020. no. 2020, p. 178-181. ISBN: 978-80-214-5896-3. ISSN: 1805-8256.
[citace_rtf] =>
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author="HADRABA, P. and SVOBODOVÁ, M. and LIN, H. and HADAŠ, Z.",
title="TIME-DOMAIN SIMULATIONS OF GROOVING PROCESS WITH STIFFNESS UNCERTANTITIES",
booktitle="ENGINEERING MECHANICS 2020",
year="2020",
journal="Engineering Mechanics ....",
volume="26",
number="2020",
pages="178--181",
publisher="BRNO UNIV TECHNOL, FAC MECHANICAL ENGINEERING",
address="BRNO",
doi="10.21495/5896-3-178",
isbn="978-80-214-5896-3",
issn="1805-8256",
url="https://www.engmech.cz/im/proceedings/show_p/2020/178"
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[nazev_en] => TIME-DOMAIN SIMULATIONS OF GROOVING PROCESS WITH STIFFNESS UNCERTANTITIES
[popis_en] => In the world of nonlinear dynamics, it is necessary to consider the fact that a small change of input parameter can cause large changes in results. However, several methods deal with uncertainty. This paper compares two methods for uncertainty analysis, polynomial chaos expansion, and Monte Carlo method. The analysis was performed on the structure of the machine tool slide. The two main components - linear roller guideway with preload and linear ball screw, they both present with the nonlinear characteristic. The stiffness of these components is dependent on the deformation as well as the direction of load. The results of both methods match reasonably in a stable condition. For the unstable machining should be surrogated model improve for further analysis. The main advantage of PCE is a shorter computation time in contrast to time-consuming MC. This approach enables not only the stimulation of the machining process in local conditions but in the future, it might be also extended for the analysis of machine tool stability in the full condition range.
[klicova_slova_en] => Polynomial chaos expansion; Monte Carlo; Turning model; Uncertainty analysis; Nonlinear stiffness
[vysledek_datum] => 2020-11-24T00:00:00+01:00
)
[14] => Array
(
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[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
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[nadrazena_soucast_zkratka] => FME
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[originalni_jazyk] => en
[schvalil_id] => 3218
[schvaleno] => 2022-03-11
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[vycet_osob] => HUTAŘ, P.; OPLT, T.; JAMBOR, M.; NÁHLÍK, L.
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[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
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[identifikator_popis] => ISSN - AIP conference proceedings (US)
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[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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[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
)
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[title] => Experimental stress analysis 2021 (EAN 2021)
[typ] => EV
[year] => 2021
[id_vav] => 173129
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[1] => Array
(
[quotations] => POKORNÝ, J.; NÁVRAT, T.
[title] => Measured and Calculated Static Equilibrium Position of Water-Lubricated Tilting-Pad Journal Bearing
[typ] => PV
[year] => 2021
[id_vav] => 173141
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(
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[title] => Determination of Mechanical and Fracture Properties of Silicon Single Crystal from Indentation Experiments and Finite Element Modelling
[typ] => PV
[year] => 2021
[id_vav] => 173211
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(
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[title] => Full-Range Optical Imaging of Planar Collagen Fiber Orientation Using Polarized Light Microscopy
[typ] => PV
[year] => 2021
[id_vav] => 175037
)
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(
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[title] => Contactless Fault Detection of a DC Motor Direction of Rotation Using Its Stray Magnetic Field
[typ] => PV
[year] => 2021
[id_vav] => 175189
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(
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[title] => Constitutive models and failure properties of fibrous tissues of carotid artery atheroma based on their uniaxial testing
[typ] => PV
[year] => 2021
[id_vav] => 175254
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(
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[title] => Numerical simulation of sound propagation around human head during phonation
[typ] => PV
[year] => 2021
[id_vav] => 175542
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(
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[title] => 27th International Congress on Sound and Vibration
[typ] => EV
[year] => 2021
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[title] => Finite-element modeling of vocal fold self-oscillations in interaction with vocal tract: Comparison of incompressible and compressible flow model
[typ] => PV
[year] => 2021
[id_vav] => 175617
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(
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[title] => Verifikovaný postup minimalizace zbytkových napětí vibrační metodou s využitím počítačové simulace
[typ] => AV
[year] => 2021
[id_vav] => 176153
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(
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[title] => Impact of physiological loads of arterial wall on nucleus deformation in endothelial cells: A computational study
[typ] => PV
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(
[quotations] => KOŠŤÁL, J.; ŠEBEK, F.; PETRUŠKA, J.; SEIFERT, T.
[title] => Cyclic plasticity models and fatigue criteria for exhaust manifold life assessment in the context of limited material data available
[typ] => PV
[year] => 2022
[id_vav] => 176397
)
[12] => Array
(
[quotations] => STACHIV, I.; MACHŮ, Z.; ŠEVEČEK, O.; TUHOVČÁK, O.; KOTOUL, M.; JENG, Y.
[title] => Resolving measurement of large (similar to GDa) chemical/biomolecule complexes with multimode nanomechanical resonators
[typ] => PV
[year] => 2022
[id_vav] => 176781
)
[13] => Array
(
[quotations] => HADRABA, P.; SVOBODOVÁ, M.; LIN, H.; HADAŠ, Z.
[title] => TIME-DOMAIN SIMULATIONS OF GROOVING PROCESS WITH STIFFNESS UNCERTANTITIES
[typ] => PV
[year] => 2020
[id_vav] => 177051
)
[14] => Array
(
[quotations] => HUTAŘ, P.; OPLT, T.; JAMBOR, M.; NÁHLÍK, L.
[title] => Numerical simulations of semi-elliptical fatigue crack propagation
[typ] => PV
[year] => 2020
[id_vav] => 177130
)
)
)