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[popis] => Conference EM2017 aims to provide a forum for researchers, industry practitioners, engineers and postgraduate scholars to promote, exchange and disseminate knowledge and experiences of the most recent results and advances in a wide range of topics in Engineering Mechanics, including, but not limited to: Biomechanics, Dynamics, Fluid Mechanics, Fracture Mechanics, Historical Structures, Kinematics, Mechanics of Solids, Mechatronics, Reliability of Structures and Thermomechanics.
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title="Engineering Mechanics 2017",
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[nazev] => Stress Analysis of the Thin Coating of the Trapeziometacarpal Replacement
[nazev_orig] => Stress Analysis of the Thin Coating of the Trapeziometacarpal Replacement
[duvernost_udaju_id] => S
[popis] => The paper reviews stress and deformation analysis of the thin coating. The coating covers a surface of a contact component of the trapeziometacarpal joint replacement which serves as a surgical treatment of a hand joint disease called rhizarthrosis. Motivation for this study consists mainly in the fact of occasional damage of some parts of the replacement in practice. It emerged that the thin coating breaks in the location of contact which opens an effort to explore stress states of such a location depending on various input parameters. Better awareness of detailed contact conditions could lead to improvement of the replacement design and, thus, prevention from necessary reoperation.
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[identifikator] => ISBN 978-3-0357-1209-4 ISSN 1012-0386
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[citace_text] => SVOJANOVSKÝ, T.; FUIS, V. Stress Analysis of the Thin Coating of the Trapeziometacarpal Replacement. In Defect and Diffusion Forum. Defect and Diffusion Forum. Switzerland: Trans Tech Publications Ltd, 2018. p. 213-217. ISBN: 978-3-0357-1209-4. ISSN: 1012-0386.
[citace_html] => SVOJANOVSKÝ, T.; FUIS, V. Stress Analysis of the Thin Coating of the Trapeziometacarpal Replacement. In Defect and Diffusion Forum. Defect and Diffusion Forum. Switzerland: Trans Tech Publications Ltd, 2018. p. 213-217. ISBN: 978-3-0357-1209-4. ISSN: 1012-0386.
[citace_rtf] =>
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author="Tomáš {Svojanovský} and Vladimír {Fuis}",
title="Stress Analysis of the Thin Coating of the Trapeziometacarpal Replacement",
booktitle="Defect and Diffusion Forum",
year="2018",
journal="Defect and Diffusion Forum",
volume="382",
pages="213--217",
publisher="Trans Tech Publications Ltd",
address="Switzerland",
doi="10.4028/www.scientific.net/DDF.382.213",
isbn="978-3-0357-1209-4",
issn="1012-0386"
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[nazev_en] => Stress Analysis of the Thin Coating of the Trapeziometacarpal Replacement
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[nazev] => Estimation of critical applied stress for crack initiation from a sharp V-notch
[nazev_orig] => Estimation of critical applied stress for crack initiation from a sharp V-notch
[duvernost_udaju_id] => S
[popis] => The aim of this paper is to estimate the critical applied stress value for a crack initiated from a sharp V-notch tip. The classical approach of linear elastic fracture mechanics (LELM) was generalized because the stress singularity exponent differs from 0.5 in the studied case. The value of the stress singularity exponent depends on the V-notch opening angle. The finite element method was used to determine the stress distribution near the sharp V-notch tip and for estimating the generalized stress intensity factor depending on the V-notch opening angle. The critical value of the generalized stress intensity factor was obtained using stability criteria based on the tangential stress component averaged over a critical distance from the V-notch tip and the generalized strain energy density factor. These criteria were applied in the case of corner stress singularity, as well. The calculated values of the critical applied stresses were compared with the experimental data from the literature, and the applicability of the LEFM concept is discussed.
[popis_orig] => The aim of this paper is to estimate the critical applied stress value for a crack initiated from a sharp V-notch tip. The classical approach of linear elastic fracture mechanics (LELM) was generalized because the stress singularity exponent differs from 0.5 in the studied case. The value of the stress singularity exponent depends on the V-notch opening angle. The finite element method was used to determine the stress distribution near the sharp V-notch tip and for estimating the generalized stress intensity factor depending on the V-notch opening angle. The critical value of the generalized stress intensity factor was obtained using stability criteria based on the tangential stress component averaged over a critical distance from the V-notch tip and the generalized strain energy density factor. These criteria were applied in the case of corner stress singularity, as well. The calculated values of the critical applied stresses were compared with the experimental data from the literature, and the applicability of the LEFM concept is discussed.
[klicova_slova] => Generalized linear elastic fracture mechanics, V-notch, generalized stress intenzity factor, mean stress criterion, critical stress
[klicova_slova_orig] => Generalized linear elastic fracture mechanics, V-notch, generalized stress intenzity factor, mean stress criterion, critical stress
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[citace_text] => NÁHLÍK, L.; ŠTEGNEROVÁ, K.; HUTAŘ, P. Estimation of critical applied stress for crack initiation from a sharp V-notch. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2018, no. 93, p. 247-262. ISSN: 0167-8442.
[citace_html] => NÁHLÍK, L.; ŠTEGNEROVÁ, K.; HUTAŘ, P. Estimation of critical applied stress for crack initiation from a sharp V-notch. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2018, no. 93, p. 247-262. ISSN: 0167-8442.
[citace_rtf] =>
[citace_bibtex] => @article{BUT156228,
author="Luboš {Náhlík} and Kateřina {Štegnerová} and Pavel {Hutař}",
title="Estimation of critical applied stress for crack initiation from a sharp V-notch",
journal="THEORETICAL AND APPLIED FRACTURE MECHANICS",
year="2018",
number="93",
pages="247--262",
doi="10.1016/j.tafmec.2017.09.002",
issn="0167-8442"
}
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[nazev_en] => Estimation of critical applied stress for crack initiation from a sharp V-notch
[popis_en] => The aim of this paper is to estimate the critical applied stress value for a crack initiated from a sharp V-notch tip. The classical approach of linear elastic fracture mechanics (LELM) was generalized because the stress singularity exponent differs from 0.5 in the studied case. The value of the stress singularity exponent depends on the V-notch opening angle. The finite element method was used to determine the stress distribution near the sharp V-notch tip and for estimating the generalized stress intensity factor depending on the V-notch opening angle. The critical value of the generalized stress intensity factor was obtained using stability criteria based on the tangential stress component averaged over a critical distance from the V-notch tip and the generalized strain energy density factor. These criteria were applied in the case of corner stress singularity, as well. The calculated values of the critical applied stresses were compared with the experimental data from the literature, and the applicability of the LEFM concept is discussed.
[klicova_slova_en] => Generalized linear elastic fracture mechanics, V-notch, generalized stress intenzity factor, mean stress criterion, critical stress
[vysledek_datum] => 2018-03-12T00:00:00+01:00
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[nazev] => Effect of the free surface on the fatigue crack front curvature at high stress asymmetry
[nazev_orig] => Effect of the free surface on the fatigue crack front curvature at high stress asymmetry
[duvernost_udaju_id] => S
[popis] => The purpose of this paper is to investigate the effect of the vertex singularity on the fatigue crack front behaviour. Single edge notch bend specimens of steel EA4T and aluminium alloy 7075 of various thicknesses are
subjected to the cyclic loading and the angles of the fatigue crack front curvature was measured. The experimental procedure is simulated using finite element analysis. Two methodologies used for the fatigue crack front
shape estimation are compared. One is using stress singularity exponent as a controlling parameter and the second one is using stress intensity factor. Both methodologies provide comparable results of crack front formation
process and they are in very good agreement with experimental results.
[popis_orig] => The purpose of this paper is to investigate the effect of the vertex singularity on the fatigue crack front behaviour. Single edge notch bend specimens of steel EA4T and aluminium alloy 7075 of various thicknesses are
subjected to the cyclic loading and the angles of the fatigue crack front curvature was measured. The experimental procedure is simulated using finite element analysis. Two methodologies used for the fatigue crack front
shape estimation are compared. One is using stress singularity exponent as a controlling parameter and the second one is using stress intensity factor. Both methodologies provide comparable results of crack front formation
process and they are in very good agreement with experimental results.
[klicova_slova] => Stress intensity factor; Vertex singularity; Free surface; Fatigue crack front; Finite elements
[klicova_slova_orig] => Stress intensity factor; Vertex singularity; Free surface; Fatigue crack front; Finite elements
[url] => https://www.sciencedirect.com/science/article/pii/S0142112318304080?via%3Dihub
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[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
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[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISSN 0142-1123
[identifikator_popis] => ISSN - International Journal of Fatigue (GB)
[riv_dodavka_id] => 2419
[riv_dodavka_oznaceni] => RIV20-MSM-26210___
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[citace_text] => OPLT, T.; HUTAŘ, P.; POKORNÝ, P.; NÁHLÍK, L.; CHLUP, Z.; BERTO, F. Effect of the free surface on the fatigue crack front curvature at high stress asymmetry. International Journal of Fatigue, 2018, vol. 118, no. 2019, p. 249-261. ISSN: 0142-1123.
[citace_html] => OPLT, T.; HUTAŘ, P.; POKORNÝ, P.; NÁHLÍK, L.; CHLUP, Z.; BERTO, F. Effect of the free surface on the fatigue crack front curvature at high stress asymmetry. International Journal of Fatigue, 2018, vol. 118, no. 2019, p. 249-261. ISSN: 0142-1123.
[citace_rtf] =>
[citace_bibtex] => @article{BUT156362,
author="Tomáš {Oplt} and Pavel {Hutař} and Pavel {Pokorný} and Luboš {Náhlík} and Zdeněk {Chlup} and Filippo {Berto}",
title="Effect of the free surface on the fatigue crack front curvature at high stress asymmetry",
journal="International Journal of Fatigue",
year="2018",
volume="118",
number="2019",
pages="249--261",
doi="10.1016/j.ijfatigue.2018.08.026",
issn="0142-1123",
url="https://www.sciencedirect.com/science/article/pii/S0142112318304080?via%3Dihub"
}
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[nazev_en] => Effect of the free surface on the fatigue crack front curvature at high stress asymmetry
[popis_en] => The purpose of this paper is to investigate the effect of the vertex singularity on the fatigue crack front behaviour. Single edge notch bend specimens of steel EA4T and aluminium alloy 7075 of various thicknesses are
subjected to the cyclic loading and the angles of the fatigue crack front curvature was measured. The experimental procedure is simulated using finite element analysis. Two methodologies used for the fatigue crack front
shape estimation are compared. One is using stress singularity exponent as a controlling parameter and the second one is using stress intensity factor. Both methodologies provide comparable results of crack front formation
process and they are in very good agreement with experimental results.
[klicova_slova_en] => Stress intensity factor; Vertex singularity; Free surface; Fatigue crack front; Finite elements
[vysledek_datum] => 2018-08-22T00:00:00+02:00
)
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[nazev] => Strategy of plasticity induced crack closure numerical evaluation
[nazev_orig] => Strategy of plasticity induced crack closure numerical evaluation
[duvernost_udaju_id] => S
[popis] => A propagating fatigue crack may be partly retarded thanks to a phenomenon called fatigue crack closure. The ability to accurately describe this phenomenon is of interest for the scientific and engineering community, because of its significant impact on the fatigue crack propagation rate. A strategy for numerical modelling of the most common closure mechanism – the plasticity induced crack closure – is presented in this paper. It was observed that the generally adopted suggestions for this type of simulations, such as the length of the crack growth or the number of substeps, are not necessarily valid in general, but require to be individually specified for particular conditions. The size of the elements in the vicinity of the crack front is also a widely discussed issue and it is shown here that even without convergence, the element size may be chosen as a fixed parameter leading to very reasonable closure values with low computational costs. A method of closure level determination based on change in specimen stiffness is described here and its performance is compared to the traditional first node displacement method with Load-Debond-Unload (LDU) and Load-Debond-Unload-Load-Unload (LDULU) loading schemes.
[popis_orig] => A propagating fatigue crack may be partly retarded thanks to a phenomenon called fatigue crack closure. The ability to accurately describe this phenomenon is of interest for the scientific and engineering community, because of its significant impact on the fatigue crack propagation rate. A strategy for numerical modelling of the most common closure mechanism – the plasticity induced crack closure – is presented in this paper. It was observed that the generally adopted suggestions for this type of simulations, such as the length of the crack growth or the number of substeps, are not necessarily valid in general, but require to be individually specified for particular conditions. The size of the elements in the vicinity of the crack front is also a widely discussed issue and it is shown here that even without convergence, the element size may be chosen as a fixed parameter leading to very reasonable closure values with low computational costs. A method of closure level determination based on change in specimen stiffness is described here and its performance is compared to the traditional first node displacement method with Load-Debond-Unload (LDU) and Load-Debond-Unload-Load-Unload (LDULU) loading schemes.
[klicova_slova] => Plasticity induced crack closure;Finite element analysis; Fatigue crack propagation
[klicova_slova_orig] => Plasticity induced crack closure;Finite element analysis; Fatigue crack propagation
[url] => https://www-sciencedirect-com.ezproxy.lib.vutbr.cz/science/article/pii/S0167844218305536
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[originalni_jazyk] => en
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[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISSN 0167-8442
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[riv_dodavka_oznaceni] => RIV20-MSM-26210___
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[citace_text] => OPLT, T.; ŠEBÍK, M.; BERTO, F.; NÁHLÍK, L.; POKORNÝ, P.; HUTAŘ, P. Strategy of plasticity induced crack closure numerical evaluation. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2019, vol. 102, no. 1, p. 59-69. ISSN: 0167-8442.
[citace_html] => OPLT, T.; ŠEBÍK, M.; BERTO, F.; NÁHLÍK, L.; POKORNÝ, P.; HUTAŘ, P. Strategy of plasticity induced crack closure numerical evaluation. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2019, vol. 102, no. 1, p. 59-69. ISSN: 0167-8442.
[citace_rtf] =>
[citace_bibtex] => @article{BUT156729,
author="Tomáš {Oplt} and Marek {Šebík} and Filippo {Berto} and Luboš {Náhlík} and Pavel {Pokorný} and Pavel {Hutař}",
title="Strategy of plasticity induced crack closure numerical evaluation",
journal="THEORETICAL AND APPLIED FRACTURE MECHANICS",
year="2019",
volume="102",
number="1",
pages="59--69",
doi="10.1016/j.tafmec.2019.04.004",
issn="0167-8442",
url="https://www-sciencedirect-com.ezproxy.lib.vutbr.cz/science/article/pii/S0167844218305536"
}
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[poznamka_metriky] =>
[nazev_en] => Strategy of plasticity induced crack closure numerical evaluation
[popis_en] => A propagating fatigue crack may be partly retarded thanks to a phenomenon called fatigue crack closure. The ability to accurately describe this phenomenon is of interest for the scientific and engineering community, because of its significant impact on the fatigue crack propagation rate. A strategy for numerical modelling of the most common closure mechanism – the plasticity induced crack closure – is presented in this paper. It was observed that the generally adopted suggestions for this type of simulations, such as the length of the crack growth or the number of substeps, are not necessarily valid in general, but require to be individually specified for particular conditions. The size of the elements in the vicinity of the crack front is also a widely discussed issue and it is shown here that even without convergence, the element size may be chosen as a fixed parameter leading to very reasonable closure values with low computational costs. A method of closure level determination based on change in specimen stiffness is described here and its performance is compared to the traditional first node displacement method with Load-Debond-Unload (LDU) and Load-Debond-Unload-Load-Unload (LDULU) loading schemes.
[klicova_slova_en] => Plasticity induced crack closure;Finite element analysis; Fatigue crack propagation
[vysledek_datum] => 2019-04-04T00:00:00+02:00
)
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(
[vysledek_id] => 156749
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[nazev] => Biomechanical performance of cranial implants with different thicknesses and material properties: A finite element study
[nazev_orig] => Biomechanical performance of cranial implants with different thicknesses and material properties: A finite element study
[duvernost_udaju_id] => S
[popis] => This study investigated the effect of implant thickness and material on deformation and stress distribution within different components of cranial implant assemblies. Using the finite element method, two cranial implants, differing in size and shape, and thicknesses (1, 2, 3 and 4 mm, respectively), were simulated under three loading scenarios. The implant assembly model included the detailed geometries of the mini-plates and micro-screws and was simulated using a sub-modeling approach. Statistical assessments based on the Design of Experiment methodology and on multiple regression analysis revealed that peak stresses in the components are influenced primarily by implant thickness, while the effect of implant material is secondary. On the contrary, the implant deflection is influenced predominantly by implant material followed by implant thickness. The highest values of deformation under a 50N load were observed in the thinnest (1 mm) polymethyl methacrylate implant (Small defect: 0.296 mm; Large defect: 0.390 mm). The thinnest Polymethyl methacrylate and Polyether Ether Ketone implants also generated stresses in the implants that can potentially breach the materials' yield limit. In terms of stress distribution, the change of implant thickness had a more significant impact on the implant performance than the change of Young's modulus of the implant material. The results indicated that the stresses are concentrated in the locations of fixation; therefore, the detailed models of mini-plates and micro-screws implemented in the finite element simulation provided a better insight into the mechanical performance of the implant-skull system.
[popis_orig] => This study investigated the effect of implant thickness and material on deformation and stress distribution within different components of cranial implant assemblies. Using the finite element method, two cranial implants, differing in size and shape, and thicknesses (1, 2, 3 and 4 mm, respectively), were simulated under three loading scenarios. The implant assembly model included the detailed geometries of the mini-plates and micro-screws and was simulated using a sub-modeling approach. Statistical assessments based on the Design of Experiment methodology and on multiple regression analysis revealed that peak stresses in the components are influenced primarily by implant thickness, while the effect of implant material is secondary. On the contrary, the implant deflection is influenced predominantly by implant material followed by implant thickness. The highest values of deformation under a 50N load were observed in the thinnest (1 mm) polymethyl methacrylate implant (Small defect: 0.296 mm; Large defect: 0.390 mm). The thinnest Polymethyl methacrylate and Polyether Ether Ketone implants also generated stresses in the implants that can potentially breach the materials' yield limit. In terms of stress distribution, the change of implant thickness had a more significant impact on the implant performance than the change of Young's modulus of the implant material. The results indicated that the stresses are concentrated in the locations of fixation; therefore, the detailed models of mini-plates and micro-screws implemented in the finite element simulation provided a better insight into the mechanical performance of the implant-skull system.
[klicova_slova] => Cranioplasty; Skull implant; 3D printing; Finite element method; Mechanical properties
[klicova_slova_orig] => Cranioplasty; Skull implant; 3D printing; Finite element method; Mechanical properties
[url] => https://www.sciencedirect.com/science/article/pii/S0010482519301234?via%3Dihub
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[originalni_jazyk] => en
[schvalil_id] => 200135
[schvaleno] => 2020-04-21
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[vycet_osob] => MARCIÁN, P.; NARRA, N.; BORÁK, L.; CHAMRAD, J.; WOLFF, J.
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[citace_text] => MARCIÁN, P.; NARRA, N.; BORÁK, L.; CHAMRAD, J.; WOLFF, J. Biomechanical performance of cranial implants with different thicknesses and material properties: A finite element study. Computers in Biology and Medicine, 2019, no. 109, p. 43-52. ISSN: 0010-4825.
[citace_html] => MARCIÁN, P.; NARRA, N.; BORÁK, L.; CHAMRAD, J.; WOLFF, J. Biomechanical performance of cranial implants with different thicknesses and material properties: A finite element study. Computers in Biology and Medicine, 2019, no. 109, p. 43-52. ISSN: 0010-4825.
[citace_rtf] =>
[citace_bibtex] => @article{BUT156749,
author="Petr {Marcián} and Nathaniel {Narra} and Libor {Borák} and Jakub {Chamrad} and Jan {Wolff}",
title="Biomechanical performance of cranial implants with different thicknesses and material properties: A finite element study",
journal="Computers in Biology and Medicine",
year="2019",
number="109",
pages="43--52",
doi="10.1016/j.compbiomed.2019.04.016",
issn="0010-4825",
url="https://www.sciencedirect.com/science/article/pii/S0010482519301234?via%3Dihub"
}
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[poznamka_metriky] =>
[nazev_en] => Biomechanical performance of cranial implants with different thicknesses and material properties: A finite element study
[popis_en] => This study investigated the effect of implant thickness and material on deformation and stress distribution within different components of cranial implant assemblies. Using the finite element method, two cranial implants, differing in size and shape, and thicknesses (1, 2, 3 and 4 mm, respectively), were simulated under three loading scenarios. The implant assembly model included the detailed geometries of the mini-plates and micro-screws and was simulated using a sub-modeling approach. Statistical assessments based on the Design of Experiment methodology and on multiple regression analysis revealed that peak stresses in the components are influenced primarily by implant thickness, while the effect of implant material is secondary. On the contrary, the implant deflection is influenced predominantly by implant material followed by implant thickness. The highest values of deformation under a 50N load were observed in the thinnest (1 mm) polymethyl methacrylate implant (Small defect: 0.296 mm; Large defect: 0.390 mm). The thinnest Polymethyl methacrylate and Polyether Ether Ketone implants also generated stresses in the implants that can potentially breach the materials' yield limit. In terms of stress distribution, the change of implant thickness had a more significant impact on the implant performance than the change of Young's modulus of the implant material. The results indicated that the stresses are concentrated in the locations of fixation; therefore, the detailed models of mini-plates and micro-screws implemented in the finite element simulation provided a better insight into the mechanical performance of the implant-skull system.
[klicova_slova_en] => Cranioplasty; Skull implant; 3D printing; Finite element method; Mechanical properties
[vysledek_datum] => 2019-06-03T00:00:00+02:00
)
[6] => Array
(
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[popis] => The compression test provides a useful information about the material flow under large plastic deformations, when compared to the standard tensile test. On the other hand, it is heavily dependent on the lubrication conditions. The paper deals with two different specimen geometries resulting in two different friction conditions. The first geometry corresponds to the classical smooth cylinder. The second one was designed according to the idea of Rastegaev. It is a smooth cylinder with grooves on both faces (bases), which allow the lubricant to accumulate and prevent it from escaping the region, where the punches are in the contact with specimen. Then, both cases were computationally simulated and compared with experiments.
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[citace_text] => HÁJEK, P.; ŠVANCARA, P.; HORÁČEK, J.; ŠVEC, J. Influence of Tissue Changes in Superficial Lamina Propria on Production of Czech Vowels. In Engineering Mechanics 2019. Engineering Mechanics. First edition. Praha: Institute of Thermomechanics of the Czech Academy of Sciences, 2019. p. 141-144. ISBN: 978-80-87012-71-0. ISSN: 1805-8248.
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[citace_rtf] =>
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author="Petr {Hájek} and Pavel {Švancara} and Jaromír {Horáček} and Jan G. {Švec}",
title="Influence of Tissue Changes in Superficial Lamina Propria on Production of Czech Vowels",
booktitle="Engineering Mechanics 2019",
year="2019",
series="First edition",
journal="Engineering Mechanics",
volume="25",
pages="141--144",
publisher="Institute of Thermomechanics of the Czech Academy of Sciences",
address="Praha",
isbn="978-80-87012-71-0",
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[citace_text] => PETRUŠKA, J.; NÁVRAT, T.; HOUFEK, L.; ŠEBEK, F.: 57th International Scientific Conference on Experimental Stress Analysis (EAN). Luhačovice (03.06.2019)
[citace_html] => PETRUŠKA, J.; NÁVRAT, T.; HOUFEK, L.; ŠEBEK, F.: 57th International Scientific Conference on Experimental Stress Analysis (EAN). Luhačovice (03.06.2019)
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[citace_bibtex] => @misc{BUT157517,
title="57th International Scientific Conference on Experimental Stress Analysis (EAN)",
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note="Holding a conference"
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[nazev_en] => 57th International Scientific Conference on Experimental Stress Analysis (EAN)
[popis_en] => The objective of the conference is to report on the state-of-the-art, exchange experience, establish and strengthen relationships between universities, companies, and scientific and research institutions from the field of experimental stress analysis and numerical modeling in mechanics.
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[nazev] => Electro-mechanical singularities of piezoelectric bi-material notches and cracks
[nazev_orig] => Electro-mechanical singularities of piezoelectric bi-material notches and cracks
[duvernost_udaju_id] => S
[popis] => The paper aims to carefully investigate an asymptotic in-plane problem of bi-material sharp notches with various geometry and interface cracks in several generally monoclinic piezoelectric bi-materials using the expanded Lekhnitskii-Eshelby-Stroh formalism. A special attention is paid to the change of the asymptotic solution connected with the transition of a very closed notch into an interface crack. Also the influence of arbitrary oriented poling directions upon asymptotic solution is investigated. Four pair-combinations PZT-5H/BaTiO3, PZT-5H/PZT-6B, PZT-5H/PZT-7A and PZT-6B/PZT-7A as representatives of the so-called epsilon-class of bi-materials and six pair-combinations PZT-4/BaTiO3, PZT-4/PZT-5H, PZT-4/PZT-6B, PZT-4/PZT-7A, PZT-6B/BaTiO3, and PZT-7A/BaTiO(3 )as representatives of the kappa-class of bi-materials are analysed. It is shown that the bi-material classification into epsilon-class and kappa-class introduced by Ou and Wu (2003) for interface cracks cannot be applied to a bi-material notch with a geometry characterized by an arbitrary angle. Ou and Wu bi-material classification also fails for interface cracks if one of the poling angles differs from 90 degrees. The two-state integral derived from Beth's reciprocal principle for piezoelectric bi-materials is used to evaluate general stress intensity factors (GSIFs) for various piezoelectric bi-materials and notch configurations. The accuracy of GSIFs calculations is tested by comparing the asymptotic solutions with the results obtained by finite element method using a very fine mesh.
[popis_orig] => The paper aims to carefully investigate an asymptotic in-plane problem of bi-material sharp notches with various geometry and interface cracks in several generally monoclinic piezoelectric bi-materials using the expanded Lekhnitskii-Eshelby-Stroh formalism. A special attention is paid to the change of the asymptotic solution connected with the transition of a very closed notch into an interface crack. Also the influence of arbitrary oriented poling directions upon asymptotic solution is investigated. Four pair-combinations PZT-5H/BaTiO3, PZT-5H/PZT-6B, PZT-5H/PZT-7A and PZT-6B/PZT-7A as representatives of the so-called epsilon-class of bi-materials and six pair-combinations PZT-4/BaTiO3, PZT-4/PZT-5H, PZT-4/PZT-6B, PZT-4/PZT-7A, PZT-6B/BaTiO3, and PZT-7A/BaTiO(3 )as representatives of the kappa-class of bi-materials are analysed. It is shown that the bi-material classification into epsilon-class and kappa-class introduced by Ou and Wu (2003) for interface cracks cannot be applied to a bi-material notch with a geometry characterized by an arbitrary angle. Ou and Wu bi-material classification also fails for interface cracks if one of the poling angles differs from 90 degrees. The two-state integral derived from Beth's reciprocal principle for piezoelectric bi-materials is used to evaluate general stress intensity factors (GSIFs) for various piezoelectric bi-materials and notch configurations. The accuracy of GSIFs calculations is tested by comparing the asymptotic solutions with the results obtained by finite element method using a very fine mesh.
[klicova_slova] => Expanded Lekhnitskii-Eshelby-Stroh formalism; Piezoelectricity; Bi-material notch; Interface crack; H-integral; Generalized stress intensity factor
[klicova_slova_orig] => Expanded Lekhnitskii-Eshelby-Stroh formalism; Piezoelectricity; Bi-material notch; Interface crack; H-integral; Generalized stress intensity factor
[url] => https://www.sciencedirect.com/science/article/pii/S0013794419303169
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[citace_text] => HRSTKA, M.; PROFANT, T.; KOTOUL, M. Electro-mechanical singularities of piezoelectric bi-material notches and cracks. ENGINEERING FRACTURE MECHANICS, 2019, vol. 216, no. 1, p. 1-23. ISSN: 0013-7944.
[citace_html] => HRSTKA, M.; PROFANT, T.; KOTOUL, M. Electro-mechanical singularities of piezoelectric bi-material notches and cracks. ENGINEERING FRACTURE MECHANICS, 2019, vol. 216, no. 1, p. 1-23. ISSN: 0013-7944.
[citace_rtf] =>
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author="Miroslav {Hrstka} and Tomáš {Profant} and Michal {Kotoul}",
title="Electro-mechanical singularities of piezoelectric bi-material notches and cracks",
journal="ENGINEERING FRACTURE MECHANICS",
year="2019",
volume="216",
number="1",
pages="1--23",
doi="10.1016/j.engfracmech.2019.05.016",
issn="0013-7944",
url="https://www.sciencedirect.com/science/article/pii/S0013794419303169"
}
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[nazev_en] => Electro-mechanical singularities of piezoelectric bi-material notches and cracks
[popis_en] => The paper aims to carefully investigate an asymptotic in-plane problem of bi-material sharp notches with various geometry and interface cracks in several generally monoclinic piezoelectric bi-materials using the expanded Lekhnitskii-Eshelby-Stroh formalism. A special attention is paid to the change of the asymptotic solution connected with the transition of a very closed notch into an interface crack. Also the influence of arbitrary oriented poling directions upon asymptotic solution is investigated. Four pair-combinations PZT-5H/BaTiO3, PZT-5H/PZT-6B, PZT-5H/PZT-7A and PZT-6B/PZT-7A as representatives of the so-called epsilon-class of bi-materials and six pair-combinations PZT-4/BaTiO3, PZT-4/PZT-5H, PZT-4/PZT-6B, PZT-4/PZT-7A, PZT-6B/BaTiO3, and PZT-7A/BaTiO(3 )as representatives of the kappa-class of bi-materials are analysed. It is shown that the bi-material classification into epsilon-class and kappa-class introduced by Ou and Wu (2003) for interface cracks cannot be applied to a bi-material notch with a geometry characterized by an arbitrary angle. Ou and Wu bi-material classification also fails for interface cracks if one of the poling angles differs from 90 degrees. The two-state integral derived from Beth's reciprocal principle for piezoelectric bi-materials is used to evaluate general stress intensity factors (GSIFs) for various piezoelectric bi-materials and notch configurations. The accuracy of GSIFs calculations is tested by comparing the asymptotic solutions with the results obtained by finite element method using a very fine mesh.
[klicova_slova_en] => Expanded Lekhnitskii-Eshelby-Stroh formalism; Piezoelectricity; Bi-material notch; Interface crack; H-integral; Generalized stress intensity factor
[vysledek_datum] => 2019-05-17T00:00:00+02:00
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[nazev] => Integration and test of piezocomposite sensors for structure health monitoring in aerospace
[nazev_orig] => Integration and test of piezocomposite sensors for structure health monitoring in aerospace
[duvernost_udaju_id] => S
[popis] => The paper presents an innovative approach for Structure Health Monitoring utilizing piezocomposite plates as active sensors. The present work is motivated by the increasing interest in reduction of maintenance costs for aircrafts, which can be achieved by implementing self-sufficient sensor networks into the aircraft to predict risk states and prevent structural failures. These networks could supplement and possibly replace the expensive maintenance inspections. Piezoelectric materials have recently been under a rapid development, have been utilized in various fields of industry and due to their inexpensive and robust nature they can be used as sensors in non-intrusive Structure Health Monitoring networks. The presented approach uses piezocomposite sensors embedded into the structure of a small civil aircraft to directly measure structural vibrations. The functionality of the entire measurement chain was tested during an experimental flight, the acquired data will be used for further research of data-processing, impact detection and structure health prediction. (C) 2019 Elsevier Ltd. All rights reserved.
[popis_orig] => The paper presents an innovative approach for Structure Health Monitoring utilizing piezocomposite plates as active sensors. The present work is motivated by the increasing interest in reduction of maintenance costs for aircrafts, which can be achieved by implementing self-sufficient sensor networks into the aircraft to predict risk states and prevent structural failures. These networks could supplement and possibly replace the expensive maintenance inspections. Piezoelectric materials have recently been under a rapid development, have been utilized in various fields of industry and due to their inexpensive and robust nature they can be used as sensors in non-intrusive Structure Health Monitoring networks. The presented approach uses piezocomposite sensors embedded into the structure of a small civil aircraft to directly measure structural vibrations. The functionality of the entire measurement chain was tested during an experimental flight, the acquired data will be used for further research of data-processing, impact detection and structure health prediction. (C) 2019 Elsevier Ltd. All rights reserved.
[klicova_slova] => Structure health monitoring; Piezocomposite sensors; Non-intrusive testing; Structural vibrations
[klicova_slova_orig] => Structure health monitoring; Piezocomposite sensors; Non-intrusive testing; Structural vibrations
[url] => https://www.sciencedirect.com/science/article/pii/S0263224119307183
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[originalni_jazyk] => en
[schvalil_id] => 144901
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[citace_text] => KŠICA, F.; HADAŠ, Z.; HLINKA, J. Integration and test of piezocomposite sensors for structure health monitoring in aerospace. MEASUREMENT, 2019, vol. 147, no. 106861, p. 1-10. ISSN: 0263-2241.
[citace_html] => KŠICA, F.; HADAŠ, Z.; HLINKA, J. Integration and test of piezocomposite sensors for structure health monitoring in aerospace. MEASUREMENT, 2019, vol. 147, no. 106861, p. 1-10. ISSN: 0263-2241.
[citace_rtf] =>
[citace_bibtex] => @article{BUT158038,
author="Filip {Kšica} and Zdeněk {Hadaš} and Jiří {Hlinka}",
title="Integration and test of piezocomposite sensors for structure health monitoring in aerospace",
journal="MEASUREMENT",
year="2019",
volume="147",
number="106861",
pages="1--10",
doi="10.1016/j.measurement.2019.106861",
issn="0263-2241",
url="https://www.sciencedirect.com/science/article/pii/S0263224119307183"
}
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[nazev_en] => Integration and test of piezocomposite sensors for structure health monitoring in aerospace
[popis_en] => The paper presents an innovative approach for Structure Health Monitoring utilizing piezocomposite plates as active sensors. The present work is motivated by the increasing interest in reduction of maintenance costs for aircrafts, which can be achieved by implementing self-sufficient sensor networks into the aircraft to predict risk states and prevent structural failures. These networks could supplement and possibly replace the expensive maintenance inspections. Piezoelectric materials have recently been under a rapid development, have been utilized in various fields of industry and due to their inexpensive and robust nature they can be used as sensors in non-intrusive Structure Health Monitoring networks. The presented approach uses piezocomposite sensors embedded into the structure of a small civil aircraft to directly measure structural vibrations. The functionality of the entire measurement chain was tested during an experimental flight, the acquired data will be used for further research of data-processing, impact detection and structure health prediction. (C) 2019 Elsevier Ltd. All rights reserved.
[klicova_slova_en] => Structure health monitoring; Piezocomposite sensors; Non-intrusive testing; Structural vibrations
[vysledek_datum] => 2019-12-01T00:00:00+01:00
)
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[nazev] => Ductile Failure Predictions for the Three-Point Bending Test of a Complex Geometry Made From Aluminum Alloy
[nazev_orig] => Ductile Failure Predictions for the Three-Point Bending Test of a Complex Geometry Made From Aluminum Alloy
[duvernost_udaju_id] => S
[popis] => The ductile failure predictions have been an issue in many engineering applications. It begins with a design of machines and tools, continues with an evaluation of manufacturing processes, and last but not least ends with the assessment of various structures. The paper deals with a predictability of used criteria for a random structure of aluminum alloy 2024-T351, which was performed under the conditions of room temperature three-point bending. The bi-failure mode creates a space for the numerical studies of various approaches and gives an insight into the model performance. The plasticity was described by Lode-dependent yield criterion, which was coupled with several pressure and Lode-dependent fracture models to form a continuum damage mechanics approach via the material weakening. It was incorporated through a nonlinear damage accumulation, which was finally implemented using Fortran 77 subroutine into ABAQUS/EXPLICIT. All the models exhibited a good ability of crack onset prediction in terms of the force responses and realistic predictability of the crack propagation. The field of deformations was successfully compared with experimental data obtained by an optical method.
[popis_orig] => The ductile failure predictions have been an issue in many engineering applications. It begins with a design of machines and tools, continues with an evaluation of manufacturing processes, and last but not least ends with the assessment of various structures. The paper deals with a predictability of used criteria for a random structure of aluminum alloy 2024-T351, which was performed under the conditions of room temperature three-point bending. The bi-failure mode creates a space for the numerical studies of various approaches and gives an insight into the model performance. The plasticity was described by Lode-dependent yield criterion, which was coupled with several pressure and Lode-dependent fracture models to form a continuum damage mechanics approach via the material weakening. It was incorporated through a nonlinear damage accumulation, which was finally implemented using Fortran 77 subroutine into ABAQUS/EXPLICIT. All the models exhibited a good ability of crack onset prediction in terms of the force responses and realistic predictability of the crack propagation. The field of deformations was successfully compared with experimental data obtained by an optical method.
[klicova_slova] => constitutive relations; fracture; mechanical behavior; metals; plastic behavior
[klicova_slova_orig] => constitutive relations; fracture; mechanical behavior; metals; plastic behavior
[url] => https://asmedigitalcollection.asme.org/materialstechnology/article/141/4/041011/958485/Ductile-Failure-Predictions-for-the-Three-Point
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title="Ductile Failure Predictions for the Three-Point Bending Test of a Complex Geometry Made From Aluminum Alloy",
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