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(
[vysledek_id] => 129891
[vysledek_druh_id] => ABSTR
[ex_vysledek_id] => 121107
[vysledek_rok] => 2016
[nazev] => Finite element simulation of mechanical tests with bendo-tensegrity models of smooth muscle cell.
[nazev_orig] => Finite element simulation of mechanical tests with bendo-tensegrity models of smooth muscle cell.
[duvernost_udaju_id] => S
[popis] => It is now evident that microtubules do not have compression-only behavior but appear highly curved in
living cells under no external load. This indicates that the compressive forces in them are accompanied by
significant bending even if loaded solely by the prestrained actin bundles; this is referred to as the
“bendo-tensegrity” concept. Implementing this concept, finite element models of smooth muscle cell
(SMC) are proposed considering the dominating role of flexion in behavior of microtubules. A Finite
element simulation of atomic force microscopy (AFM) experiment with adherent cell model and tensile
test with suspended cell model is performed. The numerically predicted force-displacement curves of both
simulations are analogous to the non-linear experimental responses obtained with AFM and tensile test
for SMC; this validates the proposed bendo-tensegrity cell models. Results show that the actin cortex
plays a vital role in maintaining the cell rigidity under local deformation, whereas the microfilaments,
microtubules and intermediate filaments contribute significantly to the cell response under global
deformation.
[popis_orig] => It is now evident that microtubules do not have compression-only behavior but appear highly curved in
living cells under no external load. This indicates that the compressive forces in them are accompanied by
significant bending even if loaded solely by the prestrained actin bundles; this is referred to as the
“bendo-tensegrity” concept. Implementing this concept, finite element models of smooth muscle cell
(SMC) are proposed considering the dominating role of flexion in behavior of microtubules. A Finite
element simulation of atomic force microscopy (AFM) experiment with adherent cell model and tensile
test with suspended cell model is performed. The numerically predicted force-displacement curves of both
simulations are analogous to the non-linear experimental responses obtained with AFM and tensile test
for SMC; this validates the proposed bendo-tensegrity cell models. Results show that the actin cortex
plays a vital role in maintaining the cell rigidity under local deformation, whereas the microfilaments,
microtubules and intermediate filaments contribute significantly to the cell response under global
deformation.
[klicova_slova] => Cytoskeleton, Bendo-tensegrity, FInite element modelling, Cell mechanics
[klicova_slova_orig] => Cytoskeleton, Bendo-tensegrity, FInite element modelling, Cell mechanics
[url] =>
[oecd_obor_id] => 10610
[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] => 1594
[schvaleno] => 2017-01-10
[vykazovat_riv] => 1
[vykazovat_riv_zmeny] => 1
[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => BANSOD, Y.; BURŠA, J.
[pocet_tvurcu] => 2
[tvurci_ids] =>
[poznamka] =>
[typ_nazev] =>
[kod_doi] =>
[kod_dspace] =>
[rok_vytvoreni] =>
[pocet_zaznamu] =>
[zverejneno] => 1
[prvni_autor] =>
[korespondencni_autor] =>
[posledni_autor] =>
[znamka] =>
[kategorie_nazev] => Publication results
[druh_nazev] => Abstract
[druh_popis] => Abstract
[stav] => Approved
[vysledek_kategorie_id] => PV
[vysledek_system_kategorie_id] => PU
[vysledek_stav_id] => 3
[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
[ins_uid] => 999999
[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] =>
[identifikator_popis] =>
[riv_dodavka_id] => 1530
[riv_dodavka_oznaceni] => RIV18-TA0-26510___
[riv_dodavka_rok] => 2017
[diagnostika_pocet] => 0
[diagnostika_pocet_chyba] => 0
[diagnostika_pocet_upozorneni] => 0
[diagnostika_pocet_informace] => 0
[citace_text] => BANSOD, Y.; BURŠA, J. Finite element simulation of mechanical tests with bendo-tensegrity models of smooth muscle cell. Vranovska Ves, Czech Republic.: XXIV Cytoskeletal Club, Veterinary Research Institute, Masaryk University., 2016.
[citace_html] => BANSOD, Y.; BURŠA, J. Finite element simulation of mechanical tests with bendo-tensegrity models of smooth muscle cell. Vranovska Ves, Czech Republic.: XXIV Cytoskeletal Club, Veterinary Research Institute, Masaryk University., 2016.
[citace_rtf] =>
[citace_bibtex] => @misc{BUT129891,
author="Yogesh Deepak {Bansod} and Jiří {Burša}",
title="Finite element simulation of mechanical tests with bendo-tensegrity models of smooth muscle cell.",
year="2016",
publisher="XXIV Cytoskeletal Club, Veterinary Research Institute, Masaryk University.",
address="Vranovska Ves, Czech Republic.",
note="Abstract"
}
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[oecd_tree_podobor_id] => 10610
[oecd_tree_podobor_nazev] => Biophysics
[poznamka_metriky] =>
[nazev_en] => Finite element simulation of mechanical tests with bendo-tensegrity models of smooth muscle cell.
[popis_en] => It is now evident that microtubules do not have compression-only behavior but appear highly curved in
living cells under no external load. This indicates that the compressive forces in them are accompanied by
significant bending even if loaded solely by the prestrained actin bundles; this is referred to as the
“bendo-tensegrity” concept. Implementing this concept, finite element models of smooth muscle cell
(SMC) are proposed considering the dominating role of flexion in behavior of microtubules. A Finite
element simulation of atomic force microscopy (AFM) experiment with adherent cell model and tensile
test with suspended cell model is performed. The numerically predicted force-displacement curves of both
simulations are analogous to the non-linear experimental responses obtained with AFM and tensile test
for SMC; this validates the proposed bendo-tensegrity cell models. Results show that the actin cortex
plays a vital role in maintaining the cell rigidity under local deformation, whereas the microfilaments,
microtubules and intermediate filaments contribute significantly to the cell response under global
deformation.
[klicova_slova_en] => Cytoskeleton, Bendo-tensegrity, FInite element modelling, Cell mechanics
[vysledek_datum] => 2016-05-18T00:00:00+02:00
)
[1] => Array
(
[vysledek_id] => 130288
[vysledek_druh_id] => ARTWOS
[ex_vysledek_id] => 121305
[vysledek_rok] => 2016
[nazev] => Analysis of Accuracy of Biaxial Tests Based on their Computational Simulations
[nazev_orig] => Analysis of Accuracy of Biaxial Tests Based on their Computational Simulations
[duvernost_udaju_id] => S
[popis] => Background: Design of biaxial tension testing rig has a significant influence on quality of the measured stress-strain data. The paper analyses the effect of test parameters on the accuracy of results.
Methods: Finite element simulations of biaxial tension tests were realized and the resulting stress-strain curves (evaluated in the same manner as in real experiments) compared with the input ones by means of coefficient of determination R2. The investigated parameters were type (hooks or narrow clamps), number (2÷5) and size (0,25÷5 mm) of gripping elements, specimen size (18÷33 mm), testing protocol (different displacement ratios), and specimen material (healthy artery, aneurysm tissue, elastin, intraluminal thrombus). Numerical results were compared with experiments on porcine aortas carried out with two clamps and four hooks per edge. Experiments were evaluated with respect to the obtained quality of fit and maximum achievable stresses under equibiaxial load.
Results: 2 or 3 hooks and 2 narrow clamps per edge give the best accuracy for small specimens. Larger hook diameter increases the accuracy for low numbers of hooks. Non-equibiaxial protocols show worse accuracy than equibiaxial ones. For large specimens 4 and 5 hooks are the best choice. The experiments revealed that higher stresses can be induced by two clamps setup (median 433 vs 257 kPa in circumferential direction and median 454 vs. 333 kPa in axial direction). Quality of the fit was slightly but consistently higher with the four hooks setup (mean R2=0,984 vs. 0,9797)
Conclusion: The number of gripping elements should be chosen with respect to the need to ensure uniform force distribution along the specimen edge. Both narrow clamps and hooks achieved a comparable accuracy regardless of material. High numbers of hooks and wide clamps should be avoided for small specimens. Compared with hooks, use of narrow clamps allowed us to reach higher load until specimen rupture.
[popis_orig] => Background: Design of biaxial tension testing rig has a significant influence on quality of the measured stress-strain data. The paper analyses the effect of test parameters on the accuracy of results.
Methods: Finite element simulations of biaxial tension tests were realized and the resulting stress-strain curves (evaluated in the same manner as in real experiments) compared with the input ones by means of coefficient of determination R2. The investigated parameters were type (hooks or narrow clamps), number (2÷5) and size (0,25÷5 mm) of gripping elements, specimen size (18÷33 mm), testing protocol (different displacement ratios), and specimen material (healthy artery, aneurysm tissue, elastin, intraluminal thrombus). Numerical results were compared with experiments on porcine aortas carried out with two clamps and four hooks per edge. Experiments were evaluated with respect to the obtained quality of fit and maximum achievable stresses under equibiaxial load.
Results: 2 or 3 hooks and 2 narrow clamps per edge give the best accuracy for small specimens. Larger hook diameter increases the accuracy for low numbers of hooks. Non-equibiaxial protocols show worse accuracy than equibiaxial ones. For large specimens 4 and 5 hooks are the best choice. The experiments revealed that higher stresses can be induced by two clamps setup (median 433 vs 257 kPa in circumferential direction and median 454 vs. 333 kPa in axial direction). Quality of the fit was slightly but consistently higher with the four hooks setup (mean R2=0,984 vs. 0,9797)
Conclusion: The number of gripping elements should be chosen with respect to the need to ensure uniform force distribution along the specimen edge. Both narrow clamps and hooks achieved a comparable accuracy regardless of material. High numbers of hooks and wide clamps should be avoided for small specimens. Compared with hooks, use of narrow clamps allowed us to reach higher load until specimen rupture.
[klicova_slova] => biaxial testing, soft tissue, clamp, hook, finite element model, coefficient of determination
[klicova_slova_orig] => biaxial testing, soft tissue, clamp, hook, finite element model, coefficient of determination
[url] =>
[oecd_obor_id] => 10610
[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] => 999999
[schvaleno] => 2019-08-19
[vykazovat_riv] => 1
[vykazovat_riv_zmeny] => 1
[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => SLAŽANSKÝ, M.; POLZER, S.; BURŠA, J.
[pocet_tvurcu] => 3
[tvurci_ids] =>
[poznamka] =>
[typ_nazev] =>
[kod_doi] => 10.1111/str.12205
[kod_dspace] =>
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[pocet_zaznamu] =>
[zverejneno] => 1
[prvni_autor] =>
[korespondencni_autor] =>
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[znamka] =>
[kategorie_nazev] => Publication results
[druh_nazev] => WoS Article
[druh_popis] => Peer-reviewed article included in Web of Science database as as an “Article”, “Review” or “Letter”
[stav] => Approved
[vysledek_kategorie_id] => PV
[vysledek_system_kategorie_id] => PU
[vysledek_stav_id] => 3
[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
[ins_uid] => 999999
[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISSN 0039-2103
[identifikator_popis] => ISSN - STRAIN (GB)
[riv_dodavka_id] => 1513
[riv_dodavka_oznaceni] => RIV18-TA0-26510___
[riv_dodavka_rok] => 2017
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[diagnostika_pocet_chyba] => 0
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[citace_text] => SLAŽANSKÝ, M.; POLZER, S.; BURŠA, J. Analysis of Accuracy of Biaxial Tests Based on their Computational Simulations. STRAIN, 2016, vol. 52, no. 5, p. 424-435. ISSN: 1475-1305.
[citace_html] => SLAŽANSKÝ, M.; POLZER, S.; BURŠA, J. Analysis of Accuracy of Biaxial Tests Based on their Computational Simulations. STRAIN, 2016, vol. 52, no. 5, p. 424-435. ISSN: 1475-1305.
[citace_rtf] =>
[citace_bibtex] => @article{BUT130288,
author="Martin {Slažanský} and Stanislav {Polzer} and Jiří {Burša}",
title="Analysis of Accuracy of Biaxial Tests Based on their Computational Simulations",
journal="STRAIN",
year="2016",
volume="52",
number="5",
pages="424--435",
doi="10.1111/str.12205",
issn="0039-2103"
}
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[nazev_en] => Analysis of Accuracy of Biaxial Tests Based on their Computational Simulations
[popis_en] => Background: Design of biaxial tension testing rig has a significant influence on quality of the measured stress-strain data. The paper analyses the effect of test parameters on the accuracy of results.
Methods: Finite element simulations of biaxial tension tests were realized and the resulting stress-strain curves (evaluated in the same manner as in real experiments) compared with the input ones by means of coefficient of determination R2. The investigated parameters were type (hooks or narrow clamps), number (2÷5) and size (0,25÷5 mm) of gripping elements, specimen size (18÷33 mm), testing protocol (different displacement ratios), and specimen material (healthy artery, aneurysm tissue, elastin, intraluminal thrombus). Numerical results were compared with experiments on porcine aortas carried out with two clamps and four hooks per edge. Experiments were evaluated with respect to the obtained quality of fit and maximum achievable stresses under equibiaxial load.
Results: 2 or 3 hooks and 2 narrow clamps per edge give the best accuracy for small specimens. Larger hook diameter increases the accuracy for low numbers of hooks. Non-equibiaxial protocols show worse accuracy than equibiaxial ones. For large specimens 4 and 5 hooks are the best choice. The experiments revealed that higher stresses can be induced by two clamps setup (median 433 vs 257 kPa in circumferential direction and median 454 vs. 333 kPa in axial direction). Quality of the fit was slightly but consistently higher with the four hooks setup (mean R2=0,984 vs. 0,9797)
Conclusion: The number of gripping elements should be chosen with respect to the need to ensure uniform force distribution along the specimen edge. Both narrow clamps and hooks achieved a comparable accuracy regardless of material. High numbers of hooks and wide clamps should be avoided for small specimens. Compared with hooks, use of narrow clamps allowed us to reach higher load until specimen rupture.
[klicova_slova_en] => biaxial testing, soft tissue, clamp, hook, finite element model, coefficient of determination
[vysledek_datum] => 2016-10-04T00:00:00+02:00
)
[2] => Array
(
[vysledek_id] => 130565
[vysledek_druh_id] => CONPA
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[nazev] => Microstructural Finite-Element Analysis of Influence of Bone Density and Histomorphometric Parameters on Mechanical Behavior of Mandibular Cancellous Bone Structure
[nazev_orig] => Microstructural Finite-Element Analysis of Influence of Bone Density and Histomorphometric Parameters on Mechanical Behavior of Mandibular Cancellous Bone Structure
[duvernost_udaju_id] => S
[popis] => Using porous bioceramics became recently an alternative approach to increase bone density which is a key factor for successful dental implant application. These novel biomaterials should substitute missing natural trabecular structures in terms of material strength as well as deformation characteristics. However, mechanical behavior of these materials used as bone fillers are still in question. This problem is made more difficult by the fact that bone structure itself exhibits a complex mechanical behavior which is still in question as well and, therefore, appropriate analytical criteria should to be established. The purpose of this paper is to determine typical mechanical behavior of trabecular structure of mandibular cancellous bone using computational simulations which can serve as a basis for establishing such criteria. For this purpose, four bone specimens of various bone density were μCT-scanned and high-level finite element models including detailed trabecular structure were created on their basis to analyze relevant mechanical quantities for various loadings in terms of bone density and various histomorphometric parameters.
[popis_orig] => Using porous bioceramics became recently an alternative approach to increase bone density which is a key factor for successful dental implant application. These novel biomaterials should substitute missing natural trabecular structures in terms of material strength as well as deformation characteristics. However, mechanical behavior of these materials used as bone fillers are still in question. This problem is made more difficult by the fact that bone structure itself exhibits a complex mechanical behavior which is still in question as well and, therefore, appropriate analytical criteria should to be established. The purpose of this paper is to determine typical mechanical behavior of trabecular structure of mandibular cancellous bone using computational simulations which can serve as a basis for establishing such criteria. For this purpose, four bone specimens of various bone density were μCT-scanned and high-level finite element models including detailed trabecular structure were created on their basis to analyze relevant mechanical quantities for various loadings in terms of bone density and various histomorphometric parameters.
[klicova_slova] => µCT; Bone Density; Cancellous Bone; Finite Element Model (FEM); Human Mandible, Strain
[klicova_slova_orig] => µCT; Bone Density; Cancellous Bone; Finite Element Model (FEM); Human Mandible, Strain
[url] =>
[oecd_obor_id] => 20301
[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] => 53543
[schvaleno] => 2018-07-20
[vykazovat_riv] => 1
[vykazovat_riv_zmeny] => 1
[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => MARCIÁN, P.; FLORIAN, Z.; HORÁČKOVÁ, L.; KAISER, J.; BORÁK, L.
[pocet_tvurcu] => 5
[tvurci_ids] =>
[poznamka] =>
[typ_nazev] =>
[kod_doi] => 10.4028/www.scientific.net/SSP.258.362
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[pocet_zaznamu] =>
[zverejneno] => 1
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[posledni_autor] =>
[znamka] =>
[kategorie_nazev] => Publication results
[druh_nazev] => Paper in proceedings (conference paper)
[druh_popis] => Paper in proceedings (conference paper)
[stav] => Approved
[vysledek_kategorie_id] => PV
[vysledek_system_kategorie_id] => PU
[vysledek_stav_id] => 3
[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
[ins_uid] => 999999
[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISBN 978-3-03835-626-4 ISSN 1012-0394
[identifikator_popis] => ISBN - Materials Structure & Micromechanics of Fracture VIII ISSN - Solid State Phenomena (CH)
[riv_dodavka_id] => 1839
[riv_dodavka_oznaceni] => RIV18-TA0-26510___
[riv_dodavka_rok] => 2018
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[citace_text] => MARCIÁN, P.; FLORIAN, Z.; HORÁČKOVÁ, L.; KAISER, J.; BORÁK, L. Microstructural Finite-Element Analysis of Influence of Bone Density and Histomorphometric Parameters on Mechanical Behavior of Mandibular Cancellous Bone Structure. In Materials Structure & Micromechanics of Fracture VIII. Solid State Phenomena. Trans Tech Publications Ltd, 2017. no. 1, p. 362-365. ISBN: 978-3-03835-626-4. ISSN: 1662-9779.
[citace_html] => MARCIÁN, P.; FLORIAN, Z.; HORÁČKOVÁ, L.; KAISER, J.; BORÁK, L. Microstructural Finite-Element Analysis of Influence of Bone Density and Histomorphometric Parameters on Mechanical Behavior of Mandibular Cancellous Bone Structure. In Materials Structure & Micromechanics of Fracture VIII. Solid State Phenomena. Trans Tech Publications Ltd, 2017. no. 1, p. 362-365. ISBN: 978-3-03835-626-4. ISSN: 1662-9779.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT130565,
author="Petr {Marcián} and Zdeněk {Florian} and Ladislava {Horáčková} and Jozef {Kaiser} and Libor {Borák}",
title="Microstructural Finite-Element Analysis of Influence of Bone Density and Histomorphometric Parameters on Mechanical Behavior of Mandibular Cancellous Bone Structure",
booktitle="Materials Structure & Micromechanics of Fracture VIII",
year="2017",
journal="Solid State Phenomena",
volume="258",
number="1",
pages="362--365",
publisher="Trans Tech Publications Ltd",
doi="10.4028/www.scientific.net/SSP.258.362",
isbn="978-3-03835-626-4",
issn="1012-0394"
}
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[oecd_tree_podobor_nazev] => Mechanical engineering
[poznamka_metriky] =>
[nazev_en] => Microstructural Finite-Element Analysis of Influence of Bone Density and Histomorphometric Parameters on Mechanical Behavior of Mandibular Cancellous Bone Structure
[popis_en] => Using porous bioceramics became recently an alternative approach to increase bone density which is a key factor for successful dental implant application. These novel biomaterials should substitute missing natural trabecular structures in terms of material strength as well as deformation characteristics. However, mechanical behavior of these materials used as bone fillers are still in question. This problem is made more difficult by the fact that bone structure itself exhibits a complex mechanical behavior which is still in question as well and, therefore, appropriate analytical criteria should to be established. The purpose of this paper is to determine typical mechanical behavior of trabecular structure of mandibular cancellous bone using computational simulations which can serve as a basis for establishing such criteria. For this purpose, four bone specimens of various bone density were μCT-scanned and high-level finite element models including detailed trabecular structure were created on their basis to analyze relevant mechanical quantities for various loadings in terms of bone density and various histomorphometric parameters.
[klicova_slova_en] => µCT; Bone Density; Cancellous Bone; Finite Element Model (FEM); Human Mandible, Strain
[vysledek_datum] => 2017-01-11T00:00:00+01:00
)
[3] => Array
(
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[nazev] => Influence of the Ceramic Foam Structure Irregularity on the Tensile Response
[nazev_orig] => Influence of the Ceramic Foam Structure Irregularity on the Tensile Response
[duvernost_udaju_id] => S
[popis] => To better understand response or fracture conditions of the ceramic foam materials to the
mechanical loading, a finite element (FE) analysis of these structures has to be employed. The
cellular structure of foams can be modelled either using a detailed realistic FE model based on the
computer tomography scans or by using of simplified, beam element based, models. Nevertheless a
main drawback of the realistic foam modelling consists in its high demandingness on computational
resources. Therefore, simplified models are welcome substitutions (at least for analysis of the global
mechanical foam response). The regular foam structure, based e.g. on Kelvin cells, is simple from
the modelling point of view, but it doesn´t exactly capture the fully random character of the real
foam structures and corresponding response to the external load. Definition of the random beam
foam structure (respecting the real cell shapes and their distribution within volume), can thus
improve this deficiency. The main aim of this work is thus to compare these different modelling
approaches and quantify the influence of the foam irregularity on the response of ceramic foams to
external (tensile) loading for various model sizes.
[popis_orig] => To better understand response or fracture conditions of the ceramic foam materials to the
mechanical loading, a finite element (FE) analysis of these structures has to be employed. The
cellular structure of foams can be modelled either using a detailed realistic FE model based on the
computer tomography scans or by using of simplified, beam element based, models. Nevertheless a
main drawback of the realistic foam modelling consists in its high demandingness on computational
resources. Therefore, simplified models are welcome substitutions (at least for analysis of the global
mechanical foam response). The regular foam structure, based e.g. on Kelvin cells, is simple from
the modelling point of view, but it doesn´t exactly capture the fully random character of the real
foam structures and corresponding response to the external load. Definition of the random beam
foam structure (respecting the real cell shapes and their distribution within volume), can thus
improve this deficiency. The main aim of this work is thus to compare these different modelling
approaches and quantify the influence of the foam irregularity on the response of ceramic foams to
external (tensile) loading for various model sizes.
[klicova_slova] => Ceramic foam, irregular foam structure, Voronoi tessellation, FEM
[klicova_slova_orig] => Ceramic foam, irregular foam structure, Voronoi tessellation, FEM
[url] =>
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[vycet_osob] => ŠEVEČEK, O.; NAVRÁTIL, P.; PAPŠÍK, R.; SKALKA, P.; KOTOUL, M.
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[kod_doi] => 10.4028/www.scientific.net/SSP.258.161
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[upd_ts] => 2025-09-22
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[identifikator] => ISBN 978-3-03835-626-4 ISSN 1012-0394
[identifikator_popis] => ISBN - Materials Structure and Micromechanics of Fracture VIII ISSN - Solid State Phenomena (CH)
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[citace_text] => ŠEVEČEK, O.; NAVRÁTIL, P.; PAPŠÍK, R.; SKALKA, P.; KOTOUL, M. Influence of the Ceramic Foam Structure Irregularity on the Tensile Response. In Materials Structure and Micromechanics of Fracture VIII. Solid State Phenomena. Švýcarsko: Trans Tech Publications, 2017. no. 1, p. 161-164. ISBN: 978-3-03835-626-4. ISSN: 1662-9779.
[citace_html] => ŠEVEČEK, O.; NAVRÁTIL, P.; PAPŠÍK, R.; SKALKA, P.; KOTOUL, M. Influence of the Ceramic Foam Structure Irregularity on the Tensile Response. In Materials Structure and Micromechanics of Fracture VIII. Solid State Phenomena. Švýcarsko: Trans Tech Publications, 2017. no. 1, p. 161-164. ISBN: 978-3-03835-626-4. ISSN: 1662-9779.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT130757,
author="Oldřich {Ševeček} and Petr {Navrátil} and Roman {Papšík} and Petr {Skalka} and Michal {Kotoul}",
title="Influence of the Ceramic Foam Structure Irregularity on the Tensile Response",
booktitle="Materials Structure and Micromechanics of Fracture VIII",
year="2017",
journal="Solid State Phenomena",
volume="258",
number="1",
pages="161--164",
publisher="Trans Tech Publications",
address="Švýcarsko",
doi="10.4028/www.scientific.net/SSP.258.161",
isbn="978-3-03835-626-4",
issn="1012-0394"
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[nazev_en] => Influence of the Ceramic Foam Structure Irregularity on the Tensile Response
[popis_en] => To better understand response or fracture conditions of the ceramic foam materials to the
mechanical loading, a finite element (FE) analysis of these structures has to be employed. The
cellular structure of foams can be modelled either using a detailed realistic FE model based on the
computer tomography scans or by using of simplified, beam element based, models. Nevertheless a
main drawback of the realistic foam modelling consists in its high demandingness on computational
resources. Therefore, simplified models are welcome substitutions (at least for analysis of the global
mechanical foam response). The regular foam structure, based e.g. on Kelvin cells, is simple from
the modelling point of view, but it doesn´t exactly capture the fully random character of the real
foam structures and corresponding response to the external load. Definition of the random beam
foam structure (respecting the real cell shapes and their distribution within volume), can thus
improve this deficiency. The main aim of this work is thus to compare these different modelling
approaches and quantify the influence of the foam irregularity on the response of ceramic foams to
external (tensile) loading for various model sizes.
[klicova_slova_en] => Ceramic foam, irregular foam structure, Voronoi tessellation, FEM
[vysledek_datum] => 2017-01-05T00:00:00+01:00
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[nazev] => Application of polar elasticity to the problem of pure bending of a thick plate
[nazev_orig] => Application of polar elasticity to the problem of pure bending of a thick plate
[duvernost_udaju_id] => S
[popis] => Polar elasticity theory is emplyed to derive exact solution for the pure bending problem of a trnasversaly isotropic plate. It is then compared to the conventional elasticity solution and the corresponding composite plate solution. The material parameters of the polar model are chosen so that it represents the effective behaviour of the composite plate. The influence of the additional material constant related to the fibre size effect and affecting bending stiffness of the plate is illustrated.
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[klicova_slova] => Anisotropy; Hyperelasticity; Fibre composite; Polar elasticity; Couple stress; Bending of plate.
[klicova_slova_orig] => Anisotropy; Hyperelasticity; Fibre composite; Polar elasticity; Couple stress; Bending of plate.
[url] =>
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[citace_text] => FEDOROVA, S.; BURŠA, J. Application of polar elasticity to the problem of pure bending of a thick plate. In ECCOMAS Congress 2016 - Proceedings of the 7th European Congress on Computational Methods in Applied Sciences and Engineering. Crete, Greece: National Technical University of Athens, 2016. p. 2162-2171. ISBN: 9786188284401.
[citace_html] => FEDOROVA, S.; BURŠA, J. Application of polar elasticity to the problem of pure bending of a thick plate. In ECCOMAS Congress 2016 - Proceedings of the 7th European Congress on Computational Methods in Applied Sciences and Engineering. Crete, Greece: National Technical University of Athens, 2016. p. 2162-2171. ISBN: 9786188284401.
[citace_rtf] =>
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author="Svitlana {Fedorova} and Jiří {Burša}",
title="Application of polar elasticity to the problem of pure bending of a thick plate",
booktitle="ECCOMAS Congress 2016 - Proceedings of the 7th European Congress on Computational Methods in Applied Sciences and Engineering",
year="2016",
number="Volume 1",
pages="2162--2171",
publisher="National Technical University of Athens",
address="Crete, Greece",
doi="10.7712/100016.1949.11058",
isbn="9786188284401"
}
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[nazev_en] => Application of polar elasticity to the problem of pure bending of a thick plate
[popis_en] => Polar elasticity theory is emplyed to derive exact solution for the pure bending problem of a trnasversaly isotropic plate. It is then compared to the conventional elasticity solution and the corresponding composite plate solution. The material parameters of the polar model are chosen so that it represents the effective behaviour of the composite plate. The influence of the additional material constant related to the fibre size effect and affecting bending stiffness of the plate is illustrated.
[klicova_slova_en] => Anisotropy; Hyperelasticity; Fibre composite; Polar elasticity; Couple stress; Bending of plate.
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[nazev] => Measuring Acceleration in the Area of Human Head for Energy Harvesting Purposes
[nazev_orig] => Measuring Acceleration in the Area of Human Head for Energy Harvesting Purposes
[duvernost_udaju_id] => S
[popis] => This paper deals with measurements and statistical processing of the acceleration data measured in the area of the human head. Kinetic energy harvesters require such levels of acceleration for their excitation that could possibly be obtained from human movements. 30 different people with different characteristics were thus measured during walking at controlled speeds in order to find the common frequencies and relevant magnitudes in the acceleration waveforms. Different ways of mounting the accelerometer to the head are also presented and the measurement results compared to identify and filter out the parasitic acceleration frequencies.
[popis_orig] => This paper deals with measurements and statistical processing of the acceleration data measured in the area of the human head. Kinetic energy harvesters require such levels of acceleration for their excitation that could possibly be obtained from human movements. 30 different people with different characteristics were thus measured during walking at controlled speeds in order to find the common frequencies and relevant magnitudes in the acceleration waveforms. Different ways of mounting the accelerometer to the head are also presented and the measurement results compared to identify and filter out the parasitic acceleration frequencies.
[klicova_slova] => energy harvesting; biomedical devices; wearable electronics; acceleration measurements
[klicova_slova_orig] => energy harvesting; biomedical devices; wearable electronics; acceleration measurements
[url] =>
[oecd_obor_id] => 20201
[odpovedny_utvar_id] => 157
[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
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[identifikator] => ISBN 978-80-01-05882-4
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[citace_text] => SMILEK, J.; CIESLAR, F.; HADAŠ, Z. Measuring Acceleration in the Area of Human Head for Energy Harvesting Purposes. In Proceedings of the 2016 17th International Conference on Mechatronics – Mechatronika (ME) 2016. 1. Praha: 2016. p. 85-90. ISBN: 978-80-01-05882-4.
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[citace_rtf] =>
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title="Measuring Acceleration in the Area of Human Head for Energy Harvesting Purposes",
booktitle="Proceedings of the 2016 17th International Conference on Mechatronics – Mechatronika (ME) 2016",
year="2016",
series="1",
pages="85--90",
address="Praha",
isbn="978-80-01-05882-4"
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[nazev_en] => Measuring Acceleration in the Area of Human Head for Energy Harvesting Purposes
[popis_en] => This paper deals with measurements and statistical processing of the acceleration data measured in the area of the human head. Kinetic energy harvesters require such levels of acceleration for their excitation that could possibly be obtained from human movements. 30 different people with different characteristics were thus measured during walking at controlled speeds in order to find the common frequencies and relevant magnitudes in the acceleration waveforms. Different ways of mounting the accelerometer to the head are also presented and the measurement results compared to identify and filter out the parasitic acceleration frequencies.
[klicova_slova_en] => energy harvesting; biomedical devices; wearable electronics; acceleration measurements
[vysledek_datum] => 2016-12-07T00:00:00+01:00
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[popis] => Conference was organised by the Department of Mechanics, Faculty of Applied Sciences of the University of West Bohemia.
The main objective of this traditional conference is to bring together academicians, researchers
and industrial partners interested in relevant disciplines of mechanics to create an opportunity for meeting, discussion and collaboration among the participants.
[popis_orig] => Conference was organised by the Department of Mechanics, Faculty of Applied Sciences of the University of West Bohemia.
The main objective of this traditional conference is to bring together academicians, researchers
and industrial partners interested in relevant disciplines of mechanics to create an opportunity for meeting, discussion and collaboration among the participants.
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[citace_text] => Computational Mechanics 2016. Špičák (31.10.2016)
[citace_html] => Computational Mechanics 2016. Špičák (31.10.2016)
[citace_rtf] =>
[citace_bibtex] => @misc{BUT131472,
title="Computational Mechanics 2016",
year="2016",
note="Holding a conference"
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[nazev] => Feasibility of Incorporating Blood Pressure Distribution into Rupture Risk Assesment of Abdominal Aortic Aneurysm
[nazev_orig] => Feasibility of Incorporating Blood Pressure Distribution into Rupture Risk Assesment of Abdominal Aortic Aneurysm
[duvernost_udaju_id] => S
[popis] => Patient specific geometry is constantly showing itself as a critical input in finite element analyses of abdominal aortic aneurysms (AAA), as well as blood pressure. Unfortunately blood pressure is currently measured according to WHO standards requiring calm patient to ensure repeatability of such measurement. Although the pressure obtained in this way is valuable in clinical assessment of many diseases it is, according to biomechanical fundamentals, insufficient in AAA rupture risk assessment where knowledge of patient blood pressure distribution in his everyday life could be more advantageous.
Thus whithin this paper, we have decided to explore the possibility to incorporate the time distribution of blood pressure in patient’s common life into our probabilistic method to obtain the annual probability of rupture.
[popis_orig] => Patient specific geometry is constantly showing itself as a critical input in finite element analyses of abdominal aortic aneurysms (AAA), as well as blood pressure. Unfortunately blood pressure is currently measured according to WHO standards requiring calm patient to ensure repeatability of such measurement. Although the pressure obtained in this way is valuable in clinical assessment of many diseases it is, according to biomechanical fundamentals, insufficient in AAA rupture risk assessment where knowledge of patient blood pressure distribution in his everyday life could be more advantageous.
Thus whithin this paper, we have decided to explore the possibility to incorporate the time distribution of blood pressure in patient’s common life into our probabilistic method to obtain the annual probability of rupture.
[klicova_slova] => probabilistic approach, abdominal aortic aneurysm, finite elements method, patient-specific blood pressure distribution
[klicova_slova_orig] => probabilistic approach, abdominal aortic aneurysm, finite elements method, patient-specific blood pressure distribution
[url] => https://esbiomech.org/conference/index.php/congress/lyon2016/paper/download/332/443
[oecd_obor_id] => 10610
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[citace_text] => Stanislav Polzer, Kamil Novák, Jiří Burša. Feasibility of Incorporating Blood Pressure Distribution into Rupture Risk Assesment of Abdominal Aortic Aneurysm. ESB 2016, Lyon: 2016. p. 1 (1 s.).
[citace_html] => Stanislav Polzer, Kamil Novák, Jiří Burša. Feasibility of Incorporating Blood Pressure Distribution into Rupture Risk Assesment of Abdominal Aortic Aneurysm. ESB 2016, Lyon: 2016. p. 1 (1 s.).
[citace_rtf] =>
[citace_bibtex] => @misc{BUT131489,
author="Kamil {Novák} and Stanislav {Polzer} and Jiří {Burša}",
title="Feasibility of Incorporating Blood Pressure Distribution into Rupture Risk Assesment of Abdominal Aortic Aneurysm
",
year="2016",
pages="1--1",
address="ESB 2016, Lyon",
url="https://esbiomech.org/conference/index.php/congress/lyon2016/paper/download/332/443",
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[nazev_en] => Feasibility of Incorporating Blood Pressure Distribution into Rupture Risk Assesment of Abdominal Aortic Aneurysm
[popis_en] => Patient specific geometry is constantly showing itself as a critical input in finite element analyses of abdominal aortic aneurysms (AAA), as well as blood pressure. Unfortunately blood pressure is currently measured according to WHO standards requiring calm patient to ensure repeatability of such measurement. Although the pressure obtained in this way is valuable in clinical assessment of many diseases it is, according to biomechanical fundamentals, insufficient in AAA rupture risk assessment where knowledge of patient blood pressure distribution in his everyday life could be more advantageous.
Thus whithin this paper, we have decided to explore the possibility to incorporate the time distribution of blood pressure in patient’s common life into our probabilistic method to obtain the annual probability of rupture.
[klicova_slova_en] => probabilistic approach, abdominal aortic aneurysm, finite elements method, patient-specific blood pressure distribution
[vysledek_datum] => 2016-06-10T00:00:00+02:00
)
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(
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[nazev] => Reliability Assessment of Electromechanical Energy Harvesting Systems
[nazev_orig] => Reliability Assessment of Electromechanical Energy Harvesting Systems
[duvernost_udaju_id] => S
[popis] => Energy harvesting systems are alternative electric power sources for supplying low-power electronics from their
ambient. In the case of electromechanical energy conversion, the ambient energy to be considered is mechanical vibrations. This paper deals with establishment of methodology for initial estimation of reliability and dependability characteristics of electromagnetic vibration energy harvesting devices. The methodology presented takes advantage of reliability prediction handbooks – e.g. MIL-217F and NSWC-11– whose methods and data are a useful aid while estimating reliability predictions of brand new devices. The failure rates and MTTF predicted by this reliability assessment shown to be promising in comparison with conventional batteries. Those are a major competitors of energy harvesters when aiming to supply autonomous sensor systems. Nevertheless, all the presented data are only rough analytic predictions that necessitate further improvements and experimental verification. Accelerated life testing could promisingly be used to gain more accurate estimates and show trustworthy compliance with required MTTF and service life.
[popis_orig] => Energy harvesting systems are alternative electric power sources for supplying low-power electronics from their
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[klicova_slova] => electromechanical system, reliability assessment, energy harvesting, MTTF, failure rate prediction, dependablity
[klicova_slova_orig] => electromechanical system, reliability assessment, energy harvesting, MTTF, failure rate prediction, dependablity
[url] =>
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[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
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[vycet_osob] => JANÁK, L.; HADAŠ, Z.; SMILEK, J.
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[identifikator] => ISBN 978-80-01-05882-4
[identifikator_popis] => ISBN - Proceedings of the 2016 17th International Conference on Mechatronics – Mechatronika (ME) 2016
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[citace_text] => JANÁK, L.; HADAŠ, Z.; SMILEK, J. Reliability Assessment of Electromechanical Energy Harvesting Systems. In Proceedings of the 2016 17th International Conference on Mechatronics – Mechatronika (ME) 2016. Praha: Czech Technical University in Prague, 2016. p. 119-122. ISBN: 978-80-01-05882-4.
[citace_html] => JANÁK, L.; HADAŠ, Z.; SMILEK, J. Reliability Assessment of Electromechanical Energy Harvesting Systems. In Proceedings of the 2016 17th International Conference on Mechatronics – Mechatronika (ME) 2016. Praha: Czech Technical University in Prague, 2016. p. 119-122. ISBN: 978-80-01-05882-4.
[citace_rtf] =>
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author="Luděk {Janák} and Zdeněk {Hadaš} and Jan {Smilek}",
title="Reliability Assessment of Electromechanical Energy Harvesting Systems",
booktitle="Proceedings of the 2016 17th International Conference on Mechatronics – Mechatronika (ME) 2016",
year="2016",
number="1",
pages="119--122",
publisher="Czech Technical University in Prague",
address="Praha",
isbn="978-80-01-05882-4"
}
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[nazev_en] => Reliability Assessment of Electromechanical Energy Harvesting Systems
[popis_en] => Energy harvesting systems are alternative electric power sources for supplying low-power electronics from their
ambient. In the case of electromechanical energy conversion, the ambient energy to be considered is mechanical vibrations. This paper deals with establishment of methodology for initial estimation of reliability and dependability characteristics of electromagnetic vibration energy harvesting devices. The methodology presented takes advantage of reliability prediction handbooks – e.g. MIL-217F and NSWC-11– whose methods and data are a useful aid while estimating reliability predictions of brand new devices. The failure rates and MTTF predicted by this reliability assessment shown to be promising in comparison with conventional batteries. Those are a major competitors of energy harvesters when aiming to supply autonomous sensor systems. Nevertheless, all the presented data are only rough analytic predictions that necessitate further improvements and experimental verification. Accelerated life testing could promisingly be used to gain more accurate estimates and show trustworthy compliance with required MTTF and service life.
[klicova_slova_en] => electromechanical system, reliability assessment, energy harvesting, MTTF, failure rate prediction, dependablity
[vysledek_datum] => 2016-12-07T00:00:00+01:00
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(
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[nazev] => Influence of mesh density on calculated extreme stresses in aortic aneurysms
[nazev_orig] => Influence of mesh density on calculated extreme stresses in aortic aneurysms
[duvernost_udaju_id] => S
[popis] => The paper deals with evaluation of the influence of finite element mesh density on the resulting extreme stresses in models of abdominal aortic aneurysms. In most patient-specific computational models published recently, a free mesh of tetrahedrons is used and any information on density of the applied mesh is often missing. In this study a comparison of different mesh densities has been realized with four patient-specific model geometries, all based on a numerical reconstruction of the unloaded geometry of the aneurysm, and with two different Yeoh-type constitutive models. It has been shown that resulting maximum stresses are not mesh independent; due to a better description of the stress gradient in the critical location, the maximum wall stress increases with increasing number of elements throughout the wall thickness, especially in models without residual stresses. This effect is more pronounced when using Vande Geest constitutive model with higher strain stiffening than for Raghavan-Vorp material parameters. Although the mesh density requirements were not so high when the stress gradient was reduced by taking residual stresses into consideration, even in this case low numbers of elements throughout the wall thickness may give mesh dependent results. Although for a rigorous recommendation of the mesh density more analyses are needed, it was shown that the time consuming procedure of taking residual stresses into consideration cannot be replaced by a simpler model with rough mesh.
[popis_orig] => The paper deals with evaluation of the influence of finite element mesh density on the resulting extreme stresses in models of abdominal aortic aneurysms. In most patient-specific computational models published recently, a free mesh of tetrahedrons is used and any information on density of the applied mesh is often missing. In this study a comparison of different mesh densities has been realized with four patient-specific model geometries, all based on a numerical reconstruction of the unloaded geometry of the aneurysm, and with two different Yeoh-type constitutive models. It has been shown that resulting maximum stresses are not mesh independent; due to a better description of the stress gradient in the critical location, the maximum wall stress increases with increasing number of elements throughout the wall thickness, especially in models without residual stresses. This effect is more pronounced when using Vande Geest constitutive model with higher strain stiffening than for Raghavan-Vorp material parameters. Although the mesh density requirements were not so high when the stress gradient was reduced by taking residual stresses into consideration, even in this case low numbers of elements throughout the wall thickness may give mesh dependent results. Although for a rigorous recommendation of the mesh density more analyses are needed, it was shown that the time consuming procedure of taking residual stresses into consideration cannot be replaced by a simpler model with rough mesh.
[klicova_slova] => abdominal aortic aneurysm; finite element model; peak wall stress; mesh density
[klicova_slova_orig] => abdominal aortic aneurysm; finite element model; peak wall stress; mesh density
[url] => https://www.kme.zcu.cz/acm/acm/article/view/327
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[citace_text] => MAN, V.; POLZER, S.; BURŠA, J. Influence of mesh density on calculated extreme stresses in aortic aneurysms. Applied andComputational Mechanics, 2016, vol. 10, no. 2, p. 97-110. ISSN: 1802-680X.
[citace_html] => MAN, V.; POLZER, S.; BURŠA, J. Influence of mesh density on calculated extreme stresses in aortic aneurysms. Applied andComputational Mechanics, 2016, vol. 10, no. 2, p. 97-110. ISSN: 1802-680X.
[citace_rtf] =>
[citace_bibtex] => @article{BUT131626,
author="Vojtěch {Man} and Stanislav {Polzer} and Jiří {Burša}",
title="Influence of mesh density on calculated extreme stresses in aortic aneurysms",
journal="Applied andComputational Mechanics",
year="2016",
volume="10",
number="2",
pages="97--110",
issn="1802-680X",
url="https://www.kme.zcu.cz/acm/acm/article/view/327"
}
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[nazev_en] => Influence of mesh density on calculated extreme stresses in aortic aneurysms
[popis_en] => The paper deals with evaluation of the influence of finite element mesh density on the resulting extreme stresses in models of abdominal aortic aneurysms. In most patient-specific computational models published recently, a free mesh of tetrahedrons is used and any information on density of the applied mesh is often missing. In this study a comparison of different mesh densities has been realized with four patient-specific model geometries, all based on a numerical reconstruction of the unloaded geometry of the aneurysm, and with two different Yeoh-type constitutive models. It has been shown that resulting maximum stresses are not mesh independent; due to a better description of the stress gradient in the critical location, the maximum wall stress increases with increasing number of elements throughout the wall thickness, especially in models without residual stresses. This effect is more pronounced when using Vande Geest constitutive model with higher strain stiffening than for Raghavan-Vorp material parameters. Although the mesh density requirements were not so high when the stress gradient was reduced by taking residual stresses into consideration, even in this case low numbers of elements throughout the wall thickness may give mesh dependent results. Although for a rigorous recommendation of the mesh density more analyses are needed, it was shown that the time consuming procedure of taking residual stresses into consideration cannot be replaced by a simpler model with rough mesh.
[klicova_slova_en] => abdominal aortic aneurysm; finite element model; peak wall stress; mesh density
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[nazev] => The Effect of Residual Stress on the Process of Crack Growth Rate Determination in Polymer Pipes
[nazev_orig] => The Effect of Residual Stress on the Process of Crack Growth Rate Determination in Polymer Pipes
[duvernost_udaju_id] => S
[popis] => Accelerated tests of the polyethylene pipes are necessary for the pipe lifetime calculations. Accepted methodology for prediction of slow crack grow rate in these materials is fatigue testing of CRB (cracked round bar) specimens. This paper deals with the FEM modelling of the crack propagation during the CRB test under the influence of residual stresses. The crack growth is described based on the stress intensity factor and Paris-Erdogan law. The purpose of this research is to determine, if the residual stress influences crack behavior during CRB test.
[popis_orig] => Accelerated tests of the polyethylene pipes are necessary for the pipe lifetime calculations. Accepted methodology for prediction of slow crack grow rate in these materials is fatigue testing of CRB (cracked round bar) specimens. This paper deals with the FEM modelling of the crack propagation during the CRB test under the influence of residual stresses. The crack growth is described based on the stress intensity factor and Paris-Erdogan law. The purpose of this research is to determine, if the residual stress influences crack behavior during CRB test.
[klicova_slova] => polyethylene pipe;slow crack growth;CRB test; residual stress; lifetime
[klicova_slova_orig] => polyethylene pipe;slow crack growth;CRB test; residual stress; lifetime
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[citace_text] => PODUŠKA, J.; HUTAŘ, P.; KUČERA, J.; SADÍLEK, J.; FRANK, A.; PINTER, G.; NÁHLÍK, L. The Effect of Residual Stress on the Process of Crack Growth Rate Determination in Polymer Pipes. Solid State Phenomena, 2017, vol. 258, no. 2017, p. 174-177. ISSN: 1012-0394.
[citace_html] => PODUŠKA, J.; HUTAŘ, P.; KUČERA, J.; SADÍLEK, J.; FRANK, A.; PINTER, G.; NÁHLÍK, L. The Effect of Residual Stress on the Process of Crack Growth Rate Determination in Polymer Pipes. Solid State Phenomena, 2017, vol. 258, no. 2017, p. 174-177. ISSN: 1012-0394.
[citace_rtf] =>
[citace_bibtex] => @article{BUT131842,
author="Jan {Poduška} and Pavel {Hutař} and Jaroslav {Kučera} and Jiří {Sadílek} and Andreas {Frank} and Gerald {Pinter} and Luboš {Náhlík}",
title="The Effect of Residual Stress on the Process of Crack Growth Rate Determination in Polymer Pipes",
journal="Solid State Phenomena",
year="2017",
volume="258",
number="2017",
pages="174--177",
doi="10.4028/www.scientific.net/SSP.258.174",
issn="1012-0394",
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[nazev_en] => The Effect of Residual Stress on the Process of Crack Growth Rate Determination in Polymer Pipes
[popis_en] => Accelerated tests of the polyethylene pipes are necessary for the pipe lifetime calculations. Accepted methodology for prediction of slow crack grow rate in these materials is fatigue testing of CRB (cracked round bar) specimens. This paper deals with the FEM modelling of the crack propagation during the CRB test under the influence of residual stresses. The crack growth is described based on the stress intensity factor and Paris-Erdogan law. The purpose of this research is to determine, if the residual stress influences crack behavior during CRB test.
[klicova_slova_en] => polyethylene pipe;slow crack growth;CRB test; residual stress; lifetime
[vysledek_datum] => 2017-01-16T00:00:00+01:00
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[nazev] => Computational analysis of crack bridging in Bioglass®–based porous scaffolds by using polymer coatings
[nazev_orig] => Computational analysis of crack bridging in Bioglass®–based porous scaffolds by using polymer coatings
[duvernost_udaju_id] => S
[popis] => The main drawback still impairing the use of bioactive glasses in load-bearing applications is their intrinsic brittleness. The addition of coating constituted by polyvinyl alcohol (PVA) and microfibrillated cellulose (MFC) PVA/MFC led to a 10 fold increase of compressive strength and a 20 fold increase of tensile strength in comparison with non-coated scaffolds. Crack bridging by polymer coating was identified by fractographic observations as a main toughening mechanism. In this contribution a detailed computational analysis of crack bridging due to coating film fibrils is presented and an improvement of fracture resistance of coated scaffolds is explained.
[popis_orig] => The main drawback still impairing the use of bioactive glasses in load-bearing applications is their intrinsic brittleness. The addition of coating constituted by polyvinyl alcohol (PVA) and microfibrillated cellulose (MFC) PVA/MFC led to a 10 fold increase of compressive strength and a 20 fold increase of tensile strength in comparison with non-coated scaffolds. Crack bridging by polymer coating was identified by fractographic observations as a main toughening mechanism. In this contribution a detailed computational analysis of crack bridging due to coating film fibrils is presented and an improvement of fracture resistance of coated scaffolds is explained.
[klicova_slova] => bioactive glass scaffold, crack bridging, FE modeling, toughening mechanism
[klicova_slova_orig] => bioactive glass scaffold, crack bridging, FE modeling, toughening mechanism
[url] =>
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[identifikator] => ISBN 978-3-03835-626-4 ISSN 1012-0394
[identifikator_popis] => ISBN - Materials Structure and Micromechanics of Fracture VIII ISSN - Solid State Phenomena (CH)
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[citace_text] => KOTOUL, M.; SKALKA, P. Computational analysis of crack bridging in Bioglass®–based porous scaffolds by using polymer coatings. In Materials Structure and Micromechanics of Fracture VIII. Solid State Phenomena. Switzerland: Trans Tech Publications, 2017. p. 325-328. ISBN: 978-3-03835-626-4. ISSN: 1012-0394.
[citace_html] => KOTOUL, M.; SKALKA, P. Computational analysis of crack bridging in Bioglass®–based porous scaffolds by using polymer coatings. In Materials Structure and Micromechanics of Fracture VIII. Solid State Phenomena. Switzerland: Trans Tech Publications, 2017. p. 325-328. ISBN: 978-3-03835-626-4. ISSN: 1012-0394.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT132102,
author="Michal {Kotoul} and Petr {Skalka}",
title="Computational analysis of crack bridging in Bioglass®–based porous scaffolds by using polymer coatings",
booktitle="Materials Structure and Micromechanics of Fracture VIII",
year="2017",
journal="Solid State Phenomena",
pages="325--328",
publisher="Trans Tech Publications",
address="Switzerland",
doi="10.4028/www.scientific.net/SSP.258.325",
isbn="978-3-03835-626-4",
issn="1012-0394"
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[nazev_en] => Computational analysis of crack bridging in Bioglass®–based porous scaffolds by using polymer coatings
[popis_en] => The main drawback still impairing the use of bioactive glasses in load-bearing applications is their intrinsic brittleness. The addition of coating constituted by polyvinyl alcohol (PVA) and microfibrillated cellulose (MFC) PVA/MFC led to a 10 fold increase of compressive strength and a 20 fold increase of tensile strength in comparison with non-coated scaffolds. Crack bridging by polymer coating was identified by fractographic observations as a main toughening mechanism. In this contribution a detailed computational analysis of crack bridging due to coating film fibrils is presented and an improvement of fracture resistance of coated scaffolds is explained.
[klicova_slova_en] => bioactive glass scaffold, crack bridging, FE modeling, toughening mechanism
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[nazev] => Adaptive Feedforward Controller for a DC Motor Drive based on Inverse Dynamic Model with Recursive Least Squares Parameter Estimation
[nazev_orig] => Adaptive Feedforward Controller for a DC Motor Drive based on Inverse Dynamic Model with Recursive Least Squares Parameter Estimation
[duvernost_udaju_id] => S
[popis] => This article deals with the development of a simple adaptive controller for DC motor drives, based on the feed forward compensation of the drive's dynamic. Several variants of the drive's inverse model are proposed in both continuous and discrete form. The model's parameters are estimated online using the Recursive Least Squares method. A polynomial approximation filter (Savitzky-Golay) to determine noisy measured signal derivatives is used to estimate all of the inverse dynamic model's states. The resulting control algorithm is able to learn a complete model of the dynamics without any need for adjusting or setting user parameters. The paper also covers real experiments conducted to test the behaviour of the developed algorithm.
[popis_orig] => This article deals with the development of a simple adaptive controller for DC motor drives, based on the feed forward compensation of the drive's dynamic. Several variants of the drive's inverse model are proposed in both continuous and discrete form. The model's parameters are estimated online using the Recursive Least Squares method. A polynomial approximation filter (Savitzky-Golay) to determine noisy measured signal derivatives is used to estimate all of the inverse dynamic model's states. The resulting control algorithm is able to learn a complete model of the dynamics without any need for adjusting or setting user parameters. The paper also covers real experiments conducted to test the behaviour of the developed algorithm.
[klicova_slova] => Rapid control prototyping, adaptive control, feedforward compensation, DC motor drive, Recursive least squares, online parameter estimation, Savitzky-Golay filter
[klicova_slova_orig] => Rapid control prototyping, adaptive control, feedforward compensation, DC motor drive, Recursive least squares, online parameter estimation, Savitzky-Golay filter
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[ins_ts] => 2025-09-22
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[identifikator] => ISBN 9788001058831
[identifikator_popis] => ISBN - Mechatronika (ME), 2016 17th International Conference on Mechatronics
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[citace_text] => BRABLC M., SOVA V., GREPL R. Adaptive Feedforward Controller for a DC Motor Drive based on Inverse Dynamic Model with Recursive Least Squares Parameter Estimation. In Mechatronika (ME), 2016 17th International Conference on Mechatronics. 2016. p. 146-150. ISBN: 9788001058831.
[citace_html] => BRABLC M., SOVA V., GREPL R. Adaptive Feedforward Controller for a DC Motor Drive based on Inverse Dynamic Model with Recursive Least Squares Parameter Estimation. In Mechatronika (ME), 2016 17th International Conference on Mechatronics. 2016. p. 146-150. ISBN: 9788001058831.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT132710,
author="Martin {Brablc} and Václav {Sova} and Robert {Grepl}",
title="Adaptive Feedforward Controller for a DC Motor Drive based on Inverse Dynamic Model with Recursive Least Squares Parameter Estimation",
booktitle="Mechatronika (ME), 2016 17th International Conference on Mechatronics",
year="2016",
pages="146--150",
isbn="9788001058831"
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[nazev_en] => Adaptive Feedforward Controller for a DC Motor Drive based on Inverse Dynamic Model with Recursive Least Squares Parameter Estimation
[popis_en] => This article deals with the development of a simple adaptive controller for DC motor drives, based on the feed forward compensation of the drive's dynamic. Several variants of the drive's inverse model are proposed in both continuous and discrete form. The model's parameters are estimated online using the Recursive Least Squares method. A polynomial approximation filter (Savitzky-Golay) to determine noisy measured signal derivatives is used to estimate all of the inverse dynamic model's states. The resulting control algorithm is able to learn a complete model of the dynamics without any need for adjusting or setting user parameters. The paper also covers real experiments conducted to test the behaviour of the developed algorithm.
[klicova_slova_en] => Rapid control prototyping, adaptive control, feedforward compensation, DC motor drive, Recursive least squares, online parameter estimation, Savitzky-Golay filter
[vysledek_datum] => 2016-12-09T00:00:00+01:00
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[nazev] => Trailer Backing-up Assistant: Using ultrasound sensors based control units to safely back-up the car with trailer
[nazev_orig] => Trailer Backing-up Assistant: Using ultrasound sensors based control units to safely back-up the car with trailer
[duvernost_udaju_id] => S
[popis] => This paper deals with the idea of upgrading the current car parking assistants based on ultrasonic sensors to enable them to assist with backing-up with trailer attached to the car. Basic ideas, models and algorithms are presented in this paper. Although commercial solution of the trailer backing-up assistant is already on the market, this approach is unique in extending the use of ultrasonic sensors. Therefore significance of this paper is purely academic in its main goal, however the presented ideas may be still usefull.
[popis_orig] => This paper deals with the idea of upgrading the current car parking assistants based on ultrasonic sensors to enable them to assist with backing-up with trailer attached to the car. Basic ideas, models and algorithms are presented in this paper. Although commercial solution of the trailer backing-up assistant is already on the market, this approach is unique in extending the use of ultrasonic sensors. Therefore significance of this paper is purely academic in its main goal, however the presented ideas may be still usefull.
[klicova_slova] => Backing-up with Trailer, Parking Assistant Control Unit, Ultrasonic Sensors
[klicova_slova_orig] => Backing-up with Trailer, Parking Assistant Control Unit, Ultrasonic Sensors
[url] =>
[oecd_obor_id] => 20201
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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] => 144887
[schvaleno] => 2018-07-26
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[vlozil] => Informační systém Automat
[upravil] => Informační systém Automat
[ins_uid] => 999999
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[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISBN 9788001058831
[identifikator_popis] => ISBN - Mechatronika (ME), 2016 17th International Conference on Mechatronics
[riv_dodavka_id] => 1530
[riv_dodavka_oznaceni] => RIV18-TA0-26510___
[riv_dodavka_rok] => 2017
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[citace_text] => VEJLUPEK J. Trailer Backing-up Assistant: Using ultrasound sensors based control units to safely back-up the car with trailer. In Mechatronika (ME), 2016 17th International Conference on Mechatronics. 2016. p. 295-300. ISBN: 9788001058831.
[citace_html] => VEJLUPEK J. Trailer Backing-up Assistant: Using ultrasound sensors based control units to safely back-up the car with trailer. In Mechatronika (ME), 2016 17th International Conference on Mechatronics. 2016. p. 295-300. ISBN: 9788001058831.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT132720,
author="Josef {Vejlupek}",
title="Trailer Backing-up Assistant: Using ultrasound sensors based control units to safely back-up the car with trailer",
booktitle="Mechatronika (ME), 2016 17th International Conference on Mechatronics",
year="2016",
pages="295--300",
isbn="9788001058831"
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[popis_en] => This paper deals with the idea of upgrading the current car parking assistants based on ultrasonic sensors to enable them to assist with backing-up with trailer attached to the car. Basic ideas, models and algorithms are presented in this paper. Although commercial solution of the trailer backing-up assistant is already on the market, this approach is unique in extending the use of ultrasonic sensors. Therefore significance of this paper is purely academic in its main goal, however the presented ideas may be still usefull.
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