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[popis] => Nanoindentation is an experimental technique used for the determination of Young modulus. The commonly used Oliver-Pharr analysis based on the assumption of the equivalence of indentation curves obtained with a Berkovich and a conical indenter is employed. Nevertheless, a break-down of this equivalence in projected area between the pyramidal and conical geometry was found. This discrepancy leads to an overestimation of Young modulus and needs to be corrected with coefficient β. It corrects the difference between Young modulus from the conical and the Berkovich indentation but cannot correct the indentation curves. This paper aims at the FEM study of modelling of the nanoindentation test, the influence of the Oliver-Pharr analysis assumptions, the comparison and unification of the different values of β for the Berkovich and the conical indentation with a rigid and a diamond indenter, the correction of the indentation curves, and the explanation of the differences between the FEM calculated and experimentally measured indentation curves.
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[klicova_slova] => Pelvic trauma, composite pelvic model, stress and displacement in pelvis, pubic symphysis, acetabulum, sacroiliac joint
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[vycet_osob] => BENEŠ, J.; KUNZ, L.; LIŠKA, J.; ŠRÁM, J.; KRBEC, M.; DŽUPA, V.; KŘIVOHLÁVEK, M.; NÁVRAT, T.
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[citace_text] => BENEŠ, J.; KUNZ, L.; LIŠKA, J.; ŠRÁM, J.; KRBEC, M.; DŽUPA, V.; KŘIVOHLÁVEK, M.; NÁVRAT, T. Determination of stress and displacement on human composite pelvis under static and dynamic loading. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE, 2022, vol. 236, no. 7, p. 951-959. ISSN: 2041-3033.
[citace_html] => BENEŠ, J.; KUNZ, L.; LIŠKA, J.; ŠRÁM, J.; KRBEC, M.; DŽUPA, V.; KŘIVOHLÁVEK, M.; NÁVRAT, T. Determination of stress and displacement on human composite pelvis under static and dynamic loading. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE, 2022, vol. 236, no. 7, p. 951-959. ISSN: 2041-3033.
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author="Jan {Beneš} and Ludvík {Kunz} and Jiří {Liška} and Jaroslav {Šrám} and Martin {Krbec} and Valér {Džupa} and Martin {Křivohlávek} and Tomáš {Návrat}",
title="Determination of stress and displacement on human composite pelvis under static and dynamic loading",
journal="PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART H-JOURNAL OF ENGINEERING IN MEDICINE",
year="2022",
volume="236",
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doi="10.1177/09544119221099805",
issn="0954-4119",
url="https://journals.sagepub.com/eprint/KEXPDYDQ4EJXXTFPIMFM/full"
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[nazev] => Biomechanical analysis of all-polyethylene total knee arthroplasty on periprosthetic tibia using the finite element method
[nazev_orig] => Biomechanical analysis of all-polyethylene total knee arthroplasty on periprosthetic tibia using the finite element method
[duvernost_udaju_id] => S
[popis] => Background and objective: Total knee arthroplasty (TKA) with modern all-polyethylene tibial (APT) components has shown high long-term survival rates and comparable results to those with metal-backed tibial components. Nevertheless, APT components are primarily recommended for older and low-demand patients. There are no evidence-based biomechanical guidelines for orthopaedic surgeons to determine the appropriate lower age limit for implantation of APT components. A biomechanical analysis was assumed to be suitable to evaluate the clinical results in patients under 70 years. The scope of this study was to determine biomechanically the appropriate lower age limit for implantation of APT components.& nbsp;Methods: To generate data of the highest possible quality, the geometry of the computational models was created based on computed tomography (CT) images of a representative patient. The cortical bone tissue model distinguishes the change in mechanical properties described in three parts from the tibial cut. The cancellous bone material model has a heterogeneous distribution of mechanical properties. The values used to determine the material properties of the tissues were obtained from measurements of a CT dataset comprising 45 patients.& nbsp;Results: Computational modeling showed that in the majority of the periprosthetic volume, the von Mises strain equivalent ranges from 200 to 2700 its; these strain values induce bone modeling and remodeling. The highest measured deformation value was 2910 its. There was no significant difference in the induced mechanical response between bone models of the 60-year and 70-year age groups, and there was < 3% difference from the 65-year age group.& nbsp;Conclusions: Considering in silico limitations, we suggest that APT components could be conveniently used on a bone with mechanical properties of the examined age categories. Under defined loading conditions, implantation of TKA with APT components is expected to induce modeling and remodeling of the periprosthetic tibia. Following clinical validation, the results of our study could modify the indication criteria of the procedure, and lead to more frequent implantation of all-polyethylene TKA in younger patients. (c) 2022 The Authors. Published by Elsevier B.V.& nbsp;
[popis_orig] => Background and objective: Total knee arthroplasty (TKA) with modern all-polyethylene tibial (APT) components has shown high long-term survival rates and comparable results to those with metal-backed tibial components. Nevertheless, APT components are primarily recommended for older and low-demand patients. There are no evidence-based biomechanical guidelines for orthopaedic surgeons to determine the appropriate lower age limit for implantation of APT components. A biomechanical analysis was assumed to be suitable to evaluate the clinical results in patients under 70 years. The scope of this study was to determine biomechanically the appropriate lower age limit for implantation of APT components.& nbsp;Methods: To generate data of the highest possible quality, the geometry of the computational models was created based on computed tomography (CT) images of a representative patient. The cortical bone tissue model distinguishes the change in mechanical properties described in three parts from the tibial cut. The cancellous bone material model has a heterogeneous distribution of mechanical properties. The values used to determine the material properties of the tissues were obtained from measurements of a CT dataset comprising 45 patients.& nbsp;Results: Computational modeling showed that in the majority of the periprosthetic volume, the von Mises strain equivalent ranges from 200 to 2700 its; these strain values induce bone modeling and remodeling. The highest measured deformation value was 2910 its. There was no significant difference in the induced mechanical response between bone models of the 60-year and 70-year age groups, and there was < 3% difference from the 65-year age group.& nbsp;Conclusions: Considering in silico limitations, we suggest that APT components could be conveniently used on a bone with mechanical properties of the examined age categories. Under defined loading conditions, implantation of TKA with APT components is expected to induce modeling and remodeling of the periprosthetic tibia. Following clinical validation, the results of our study could modify the indication criteria of the procedure, and lead to more frequent implantation of all-polyethylene TKA in younger patients. (c) 2022 The Authors. Published by Elsevier B.V.& nbsp;
[klicova_slova] => Orthopaedic biomechanics; Total knee arthroplasty; Bone mechanics; All-polyethylene tibial component; Finite element model; von Mises strain
[klicova_slova_orig] => Orthopaedic biomechanics; Total knee arthroplasty; Bone mechanics; All-polyethylene tibial component; Finite element model; von Mises strain
[url] => https://www.sciencedirect.com/science/article/pii/S0169260722002164
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[vycet_osob] => APOSTOLOPOULOS, V.; TOMÁŠ, T.; BOHÁČ, P.; MARCIÁN, P.; MAHDAL, M.; VALOUŠEK, T.; JANÍČEK, P.; NACHTNEBL, L.
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[riv_dodavka_oznaceni] => RIV22-MSM-26210___
[riv_dodavka_rok] => 2022
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[citace_text] => APOSTOLOPOULOS, V.; TOMÁŠ, T.; BOHÁČ, P.; MARCIÁN, P.; MAHDAL, M.; VALOUŠEK, T.; JANÍČEK, P.; NACHTNEBL, L. Biomechanical analysis of all-polyethylene total knee arthroplasty on periprosthetic tibia using the finite element method. Computer Methods and Programs in Biomedicine, 2022, vol. 220, no. 1, p. 1-9. ISSN: 0169-2607.
[citace_html] => APOSTOLOPOULOS, V.; TOMÁŠ, T.; BOHÁČ, P.; MARCIÁN, P.; MAHDAL, M.; VALOUŠEK, T.; JANÍČEK, P.; NACHTNEBL, L. Biomechanical analysis of all-polyethylene total knee arthroplasty on periprosthetic tibia using the finite element method. Computer Methods and Programs in Biomedicine, 2022, vol. 220, no. 1, p. 1-9. ISSN: 0169-2607.
[citace_rtf] =>
[citace_bibtex] => @article{BUT178256,
author="Vasileios {Apostolopoulos} and Tomáš {Tomáš} and Petr {Boháč} and Petr {Marcián} and Michal {Mahdal} and Tomáš {Valoušek} and Pavel {Janíček} and Luboš {Nachtnebl}",
title="Biomechanical analysis of all-polyethylene total knee arthroplasty on periprosthetic tibia using the finite element method",
journal="Computer Methods and Programs in Biomedicine",
year="2022",
volume="220",
number="1",
pages="1--9",
doi="10.1016/j.cmpb.2022.106834",
issn="0169-2607",
url="https://www.sciencedirect.com/science/article/pii/S0169260722002164"
}
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[nazev_en] => Biomechanical analysis of all-polyethylene total knee arthroplasty on periprosthetic tibia using the finite element method
[popis_en] => Background and objective: Total knee arthroplasty (TKA) with modern all-polyethylene tibial (APT) components has shown high long-term survival rates and comparable results to those with metal-backed tibial components. Nevertheless, APT components are primarily recommended for older and low-demand patients. There are no evidence-based biomechanical guidelines for orthopaedic surgeons to determine the appropriate lower age limit for implantation of APT components. A biomechanical analysis was assumed to be suitable to evaluate the clinical results in patients under 70 years. The scope of this study was to determine biomechanically the appropriate lower age limit for implantation of APT components.& nbsp;Methods: To generate data of the highest possible quality, the geometry of the computational models was created based on computed tomography (CT) images of a representative patient. The cortical bone tissue model distinguishes the change in mechanical properties described in three parts from the tibial cut. The cancellous bone material model has a heterogeneous distribution of mechanical properties. The values used to determine the material properties of the tissues were obtained from measurements of a CT dataset comprising 45 patients.& nbsp;Results: Computational modeling showed that in the majority of the periprosthetic volume, the von Mises strain equivalent ranges from 200 to 2700 its; these strain values induce bone modeling and remodeling. The highest measured deformation value was 2910 its. There was no significant difference in the induced mechanical response between bone models of the 60-year and 70-year age groups, and there was < 3% difference from the 65-year age group.& nbsp;Conclusions: Considering in silico limitations, we suggest that APT components could be conveniently used on a bone with mechanical properties of the examined age categories. Under defined loading conditions, implantation of TKA with APT components is expected to induce modeling and remodeling of the periprosthetic tibia. Following clinical validation, the results of our study could modify the indication criteria of the procedure, and lead to more frequent implantation of all-polyethylene TKA in younger patients. (c) 2022 The Authors. Published by Elsevier B.V.& nbsp;
[klicova_slova_en] => Orthopaedic biomechanics; Total knee arthroplasty; Bone mechanics; All-polyethylene tibial component; Finite element model; von Mises strain
[vysledek_datum] => 2022-04-28T00:00:00+02:00
)
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[nazev] => Control of Magnetic Manipulator Using Reinforcement Learning Based on Incrementally Adapted Local Linear Models
[nazev_orig] => Control of Magnetic Manipulator Using Reinforcement Learning Based on Incrementally Adapted Local Linear Models
[duvernost_udaju_id] => S
[popis] => Reinforcement learning (RL) agents can learn to control a nonlinear system without using a model of the system. However, having a model brings benefits, mainly in terms of a reduced number of unsuccessful trials before achieving acceptable control performance. Several modelling approaches have been used in the RL domain, such as neural networks, local linear regression, or Gaussian processes. In this article, we focus on techniques that have not been used much so far: symbolic regression (SR), based on genetic programming and local modelling. Using measured data, symbolic regression yields a nonlinear, continuous-time analytic model. We benchmark two state-of-the-art methods, SNGP (single-node genetic programming) and MGGP (multigene genetic programming), against a standard incremental local regression method called RFWR (receptive field weighted regression). We have introduced modifications to the RFWR algorithm to better suit the low-dimensional continuous-time systems we are mostly dealing with. The benchmark is a nonlinear, dynamic magnetic manipulation system. The results show that using the RL framework and a suitable approximation method, it is possible to design a stable controller of such a complex system without the necessity of any haphazard learning. While all of the approximation methods were successful, MGGP achieved the best results at the cost of higher computational complexity. Index Terms-AI-based methods, local linear regression, nonlinear systems, magnetic manipulation, model learning for control, optimal control, reinforcement learning, symbolic regression.
[popis_orig] => Reinforcement learning (RL) agents can learn to control a nonlinear system without using a model of the system. However, having a model brings benefits, mainly in terms of a reduced number of unsuccessful trials before achieving acceptable control performance. Several modelling approaches have been used in the RL domain, such as neural networks, local linear regression, or Gaussian processes. In this article, we focus on techniques that have not been used much so far: symbolic regression (SR), based on genetic programming and local modelling. Using measured data, symbolic regression yields a nonlinear, continuous-time analytic model. We benchmark two state-of-the-art methods, SNGP (single-node genetic programming) and MGGP (multigene genetic programming), against a standard incremental local regression method called RFWR (receptive field weighted regression). We have introduced modifications to the RFWR algorithm to better suit the low-dimensional continuous-time systems we are mostly dealing with. The benchmark is a nonlinear, dynamic magnetic manipulation system. The results show that using the RL framework and a suitable approximation method, it is possible to design a stable controller of such a complex system without the necessity of any haphazard learning. While all of the approximation methods were successful, MGGP achieved the best results at the cost of higher computational complexity. Index Terms-AI-based methods, local linear regression, nonlinear systems, magnetic manipulation, model learning for control, optimal control, reinforcement learning, symbolic regression.
[klicova_slova] => Approximation theory; Complex networks; Continuous time systems; Genetic algorithms; Genetic programming; Magnetism; Manipulators; Nonlinear systems; Approximation methods; Local linear models; Local linear regression; Magnetic manipulation; Magnetic manipulators; Multi-gene genetic programming; Receptive fields; Reinforcement learning; Symbolic regression; Weighted regression;
[klicova_slova_orig] => Approximation theory; Complex networks; Continuous time systems; Genetic algorithms; Genetic programming; Magnetism; Manipulators; Nonlinear systems; Approximation methods; Local linear models; Local linear regression; Magnetic manipulation; Magnetic manipulators; Multi-gene genetic programming; Receptive fields; Reinforcement learning; Symbolic regression; Weighted regression;
[url] => https://www.hindawi.com/journals/complexity/2021/6617309/
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[upravil] => Informační systém Automat
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[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
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[identifikator] => ISSN 1076-2787
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[citace_text] => BRABLC, M.; ŽEGKLITZ, J.; GREPL, R.; BABUŠKA, R. Control of Magnetic Manipulator Using Reinforcement Learning Based on Incrementally Adapted Local Linear Models. COMPLEXITY, 2021, vol. 2021, no. 1, p. 1-12. ISSN: 1076-2787.
[citace_html] => BRABLC, M.; ŽEGKLITZ, J.; GREPL, R.; BABUŠKA, R. Control of Magnetic Manipulator Using Reinforcement Learning Based on Incrementally Adapted Local Linear Models. COMPLEXITY, 2021, vol. 2021, no. 1, p. 1-12. ISSN: 1076-2787.
[citace_rtf] =>
[citace_bibtex] => @article{BUT178291,
author="Martin {Brablc} and Jan {Žegklitz} and Robert {Grepl} and Robert {Babuška}",
title="Control of Magnetic Manipulator Using Reinforcement Learning Based on Incrementally Adapted Local Linear Models",
journal="COMPLEXITY",
year="2021",
volume="2021",
number="1",
pages="1--12",
doi="10.1155/2021/6617309",
issn="1076-2787",
url="https://www.hindawi.com/journals/complexity/2021/6617309/"
}
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[poznamka_metriky] =>
[nazev_en] => Control of Magnetic Manipulator Using Reinforcement Learning Based on Incrementally Adapted Local Linear Models
[popis_en] => Reinforcement learning (RL) agents can learn to control a nonlinear system without using a model of the system. However, having a model brings benefits, mainly in terms of a reduced number of unsuccessful trials before achieving acceptable control performance. Several modelling approaches have been used in the RL domain, such as neural networks, local linear regression, or Gaussian processes. In this article, we focus on techniques that have not been used much so far: symbolic regression (SR), based on genetic programming and local modelling. Using measured data, symbolic regression yields a nonlinear, continuous-time analytic model. We benchmark two state-of-the-art methods, SNGP (single-node genetic programming) and MGGP (multigene genetic programming), against a standard incremental local regression method called RFWR (receptive field weighted regression). We have introduced modifications to the RFWR algorithm to better suit the low-dimensional continuous-time systems we are mostly dealing with. The benchmark is a nonlinear, dynamic magnetic manipulation system. The results show that using the RL framework and a suitable approximation method, it is possible to design a stable controller of such a complex system without the necessity of any haphazard learning. While all of the approximation methods were successful, MGGP achieved the best results at the cost of higher computational complexity. Index Terms-AI-based methods, local linear regression, nonlinear systems, magnetic manipulation, model learning for control, optimal control, reinforcement learning, symbolic regression.
[klicova_slova_en] => Approximation theory; Complex networks; Continuous time systems; Genetic algorithms; Genetic programming; Magnetism; Manipulators; Nonlinear systems; Approximation methods; Local linear models; Local linear regression; Magnetic manipulation; Magnetic manipulators; Multi-gene genetic programming; Receptive fields; Reinforcement learning; Symbolic regression; Weighted regression;
[vysledek_datum] => 2021-12-20T00:00:00+01:00
)
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(
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[nazev] => Asymptotic solution for interface crack between two materials governed by dipolar gradient elasticity: Amplitude factor evaluation
[nazev_orig] => Asymptotic solution for interface crack between two materials governed by dipolar gradient elasticity: Amplitude factor evaluation
[duvernost_udaju_id] => S
[popis] => The procedure of assessing the amplitude factors in the asymptotic solution for the interface crack between the materials obeying the isotropic gradient elasticity is developed. The boundary conditions at tip of the crack are applied to assemble the eigenvalue problem from which the stress exponents with the appropriate eigenvectors of the regular and auxiliary solutions are evaluated. The amplitude factors of the asymptotic solution are computed from the two-state integrals in which the regular, auxiliary and particular finite element solution represent the independent equilibrium states. The concept of the two-state integral method is based on Betti's reciprocal theorem, which is frequently utilized in classical fracture mechanics. The present work extends its application to the general fracture problem in strain gradient elasticity.
[popis_orig] => The procedure of assessing the amplitude factors in the asymptotic solution for the interface crack between the materials obeying the isotropic gradient elasticity is developed. The boundary conditions at tip of the crack are applied to assemble the eigenvalue problem from which the stress exponents with the appropriate eigenvectors of the regular and auxiliary solutions are evaluated. The amplitude factors of the asymptotic solution are computed from the two-state integrals in which the regular, auxiliary and particular finite element solution represent the independent equilibrium states. The concept of the two-state integral method is based on Betti's reciprocal theorem, which is frequently utilized in classical fracture mechanics. The present work extends its application to the general fracture problem in strain gradient elasticity.
[klicova_slova] => dipolar gradient elasticity, asymptotic solution, interface crack, amplitude factor evaluation
[klicova_slova_orig] => dipolar gradient elasticity, asymptotic solution, interface crack, amplitude factor evaluation
[url] => https://www.sciencedirect.com/science/article/pii/S0167844222001264
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[nadrazena_soucast_nazev] => Fakulta strojního inženýrství
[originalni_jazyk] => en
[schvalil_id] => 86456
[schvaleno] => 2023-10-03
[vykazovat_riv] => 1
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[slozka_id] =>
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[vycet_osob] => PROFANT, T.; SLÁDEK, J.; SLÁDEK, V.; KOTOUL, M.
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[stav] => Schválený
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[upd_ts] => 2025-09-22
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[identifikator_popis] => ISSN - THEORETICAL AND APPLIED FRACTURE MECHANICS (NL)
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[citace_text] => PROFANT, T.; SLÁDEK, J.; SLÁDEK, V.; KOTOUL, M. Asymptotic solution for interface crack between two materials governed by dipolar gradient elasticity: Amplitude factor evaluation. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2022, vol. 120, no. 8, p. 103378-103378. ISSN: 0167-8442.
[citace_html] => PROFANT, T.; SLÁDEK, J.; SLÁDEK, V.; KOTOUL, M. Asymptotic solution for interface crack between two materials governed by dipolar gradient elasticity: Amplitude factor evaluation. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2022, vol. 120, no. 8, p. 103378-103378. ISSN: 0167-8442.
[citace_rtf] =>
[citace_bibtex] => @article{BUT178315,
author="Tomáš {Profant} and Ján {Sládek} and Vladimír {Sládek} and Michal {Kotoul}",
title="Asymptotic solution for interface crack between two materials governed by dipolar gradient elasticity: Amplitude factor evaluation",
journal="THEORETICAL AND APPLIED FRACTURE MECHANICS",
year="2022",
volume="120",
number="8",
pages="103378--103378",
doi="10.1016/j.tafmec.2022.103378",
issn="0167-8442",
url="https://www.sciencedirect.com/science/article/pii/S0167844222001264"
}
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[nazev_en] => Asymptotic solution for interface crack between two materials governed by dipolar gradient elasticity: Amplitude factor evaluation
[popis_en] => The procedure of assessing the amplitude factors in the asymptotic solution for the interface crack between the materials obeying the isotropic gradient elasticity is developed. The boundary conditions at tip of the crack are applied to assemble the eigenvalue problem from which the stress exponents with the appropriate eigenvectors of the regular and auxiliary solutions are evaluated. The amplitude factors of the asymptotic solution are computed from the two-state integrals in which the regular, auxiliary and particular finite element solution represent the independent equilibrium states. The concept of the two-state integral method is based on Betti's reciprocal theorem, which is frequently utilized in classical fracture mechanics. The present work extends its application to the general fracture problem in strain gradient elasticity.
[klicova_slova_en] => dipolar gradient elasticity, asymptotic solution, interface crack, amplitude factor evaluation
[vysledek_datum] => 2022-08-01T00:00:00+02:00
)
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[nazev] => Evaluation of image registration for measuring deformation fields in soft tissue mechanics
[nazev_orig] => Evaluation of image registration for measuring deformation fields in soft tissue mechanics
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[popis] => High-fidelity biomechanical models usually involve the mechanical characterisation of biological tissues using experimental methods based on optical measurements. In most experiments, strains are evaluated based on displacements of a few markers and represents an average within the region of interest (ROI). Full-field measurements may improve description of non-homogeneous materials such as soft tissues. The approach based on non-rigid image registration is proposed and compared with standard digital image correlation (DIC) on a set of samples, including (i) complex heterogeneous deformations with sub-pixel displacement, (ii) a typical uniaxial tension test of aorta, and (iii) an indentation test on skin. The possibility to extend the ROI to the whole sample and the exploitation of a natural tissue pattern represents the main assets of the proposed method whereas the results show similar accuracy as standard DIC when analysing sub-pixel deformations. Therefore, displacement and strain fields measurement based on image registration is very promising to characterise heterogeneous specimens with irregular shapes and/or small dimensions, which are typical features of soft biological tissues.
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[citace_text] => VOJTEK, T.; KUBÍČEK, R.; POKORNÝ, P.; JAMBOR, M.; HUTAŘ, P. CONCEPTUAL PROBLEMS WITH FATIGUE CRACK CLOSURE AND PLASTICITY: INFLUENCE OF CYCLIC SOFTENING. Sixth IJFatigue & FFEMS Joint Workshop Characterisation of Crack/Notch Tip Fields under Static, Dynamic or Cyclic loading - Book of Abstracts. Zagreb: University of Zagreb, 2022. p. 32-32. ISBN: 978-953-7738-83-9.
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author="Tomáš {Vojtek} and Radek {Kubíček} and Pavel {Pokorný} and Michal {Jambor} and Pavel {Hutař}",
title="CONCEPTUAL PROBLEMS WITH FATIGUE CRACK CLOSURE AND PLASTICITY: INFLUENCE OF CYCLIC SOFTENING",
booktitle="Sixth IJFatigue & FFEMS Joint Workshop Characterisation of Crack/Notch Tip Fields under Static, Dynamic or Cyclic loading - Book of Abstracts",
year="2022",
pages="32--32",
publisher="University of Zagreb",
address="Zagreb",
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[nazev_en] => CONCEPTUAL PROBLEMS WITH FATIGUE CRACK CLOSURE AND PLASTICITY: INFLUENCE OF CYCLIC SOFTENING
[popis_en] => Plasticity-induced crack closure (PICC) should be proportional to the amount of plastic deformation near the crack tip. This suggests that softer materials have larger PICC than harder materials, which is often a way of explanation of the observed crack growth rates at low R. However, experimental data showed that at high load ratio R = 0.8 (presumption of no crack closure), the crack growth rates were higher in a high-strength steel limited cyclic hardening), denoted as "hard steel", compared to a steel with pronounced cyclic softening (denoted "soft steel"). At low load ratio R = 0.1 in the Paris regime, it was the opposite: the "hard steel" exhibited slower crack propagation. This means that the crack closure effect was much larger in the harder material. Such behaviour cannot be explained based on classical ideas about crack closure.
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[popis] => Background The hole-drilling method is a well-known and widely used technique for the determination of residual stresses, but is limited to materials with linear elastic behaviour. This can be a problem when high residual stresses are measured, since a local yielding can occur due to stress concentration around the drilled hole. Objective If the residual stress exceeds about 80% of the material yield stress, the error caused by the plasticity effect becomes significant. In order to correctly evaluate high uniform residual stresses, a universal procedure for a correction of the plasticity effect is introduced. Methods The procedure uses a neural network and is capable of correcting any combination of uniform residual stresses with magnitudes up to the material yield stress. It also covers a wide range of material parameters, hole diameters, and strain gauge rosettes and it is independent of the orientation of the strain gauge rosette. Results The correction procedure was tested by more than a million randomly generated stress states that covered the entire range of input parameters and performs remarkably well, since the error of the corrected residual stresses is negligible even for the states with residual stress magnitudes equal to the material yield stress. Conclusions The proposed correction extends the application range of the hole-drilling method to high uniform residual stresses and therefore can be very useful for practical measurements.
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simulations
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[citace_text] => HALABUK, D.; NÁVRAT, T. Universal Procedure for Correction of Plasticity Effect in Hole‑Drilling Uniform Residual Stress Measurement. Experimental Mechanics, 2022, vol. 62, no. 8, p. 1267-1287. ISSN: 0014-4851.
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[id_vav] => 177944
)
[3] => Array
(
[quotations] => BENEŠ, J.; KUNZ, L.; LIŠKA, J.; ŠRÁM, J.; KRBEC, M.; DŽUPA, V.; KŘIVOHLÁVEK, M.; NÁVRAT, T.
[title] => Determination of stress and displacement on human composite pelvis under static and dynamic loading
[typ] => PV
[year] => 2022
[id_vav] => 177956
)
[4] => Array
(
[quotations] =>
[title] => International Conference on Plasticity, Damage and Fracture (ICPDF 2018)
[typ] => EV
[year] => 2018
[id_vav] => 178171
)
[5] => Array
(
[quotations] =>
[title] => NuMat 2018: The Nuclear Materials Conference
[typ] => EV
[year] => 2018
[id_vav] => 178172
)
[6] => Array
(
[quotations] => APOSTOLOPOULOS, V.; TOMÁŠ, T.; BOHÁČ, P.; MARCIÁN, P.; MAHDAL, M.; VALOUŠEK, T.; JANÍČEK, P.; NACHTNEBL, L.
[title] => Biomechanical analysis of all-polyethylene total knee arthroplasty on periprosthetic tibia using the finite element method
[typ] => PV
[year] => 2022
[id_vav] => 178256
)
[7] => Array
(
[quotations] => BRABLC, M.; ŽEGKLITZ, J.; GREPL, R.; BABUŠKA, R.
[title] => Control of Magnetic Manipulator Using Reinforcement Learning Based on Incrementally Adapted Local Linear Models
[typ] => PV
[year] => 2021
[id_vav] => 178291
)
[8] => Array
(
[quotations] => PROFANT, T.; SLÁDEK, J.; SLÁDEK, V.; KOTOUL, M.
[title] => Asymptotic solution for interface crack between two materials governed by dipolar gradient elasticity: Amplitude factor evaluation
[typ] => PV
[year] => 2022
[id_vav] => 178315
)
[9] => Array
(
[quotations] => LISICKÝ, O.; AVRIL, S.; EYDAN, B.; PIERRAT, B.; BURŠA, J.
[title] => Evaluation of image registration for measuring deformation fields in soft tissue mechanics
[typ] => PV
[year] => 2022
[id_vav] => 178370
)
[10] => Array
(
[quotations] => ŠNAJDER, J.; BEDNAŘÍK, J.
[title] => Czech Sign Language Single Hand Alphabet Classification with MediaPipe
[typ] => PV
[year] => 2022
[id_vav] => 178377
)
[11] => Array
(
[quotations] => KUBÍČEK, R.; OPLT, T.; VOJTEK, T.; NÁHLÍK, L.; HUTAŘ, P.
[title] => Crack Front Shape Based on Plastic Component of CTOD
[typ] => PV
[year] => 2022
[id_vav] => 178594
)
[12] => Array
(
[quotations] => VOJTEK, T.; KUBÍČEK, R.; POKORNÝ, P.; JAMBOR, M.; HUTAŘ, P.
[title] => CONCEPTUAL PROBLEMS WITH FATIGUE CRACK CLOSURE AND PLASTICITY: INFLUENCE OF CYCLIC SOFTENING
[typ] => PV
[year] => 2022
[id_vav] => 178595
)
[13] => Array
(
[quotations] => HALABUK, D.; NÁVRAT, T.
[title] => Universal Procedure for Correction of Plasticity Effect in Hole‑Drilling Uniform Residual Stress Measurement
[typ] => PV
[year] => 2022
[id_vav] => 178841
)
[14] => Array
(
[quotations] =>
[title] => Engineering Mechanics 2022
[typ] => EV
[year] => 2022
[id_vav] => 179266
)
)
)