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[nazev] => Influnce of Mutual Rotation of Polarizing Filters on Light Intensity Measured with Collagen Fibres
[nazev_orig] => Influnce of Mutual Rotation of Polarizing Filters on Light Intensity Measured with Collagen Fibres
[duvernost_udaju_id] => S
[popis] => The most common technique for observation of collagen fibres and evaluation
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are two polarizing filters, polarizer and analyzer, that can rotate individually. The
default position of the polarizer is perpendicular to the analyzer. When the light
passes through a birefringent specimen, the plane of the polarized light is rotated.
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and both filters. If the orientation of the polarizer differs from the perpendicular
direction to the analyzer, the period of light intensity changes to 180◦; one of the
original maxima increases and the other decreases. This change is very useful for
the determination of directions of collagen fibres by an automatic algorithm.
[popis_orig] => The most common technique for observation of collagen fibres and evaluation
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default position of the polarizer is perpendicular to the analyzer. When the light
passes through a birefringent specimen, the plane of the polarized light is rotated.
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and both filters. If the orientation of the polarizer differs from the perpendicular
direction to the analyzer, the period of light intensity changes to 180◦; one of the
original maxima increases and the other decreases. This change is very useful for
the determination of directions of collagen fibres by an automatic algorithm.
[klicova_slova] => Polarized light microscopy; collagen fibers; birefrigence; light intensity
[klicova_slova_orig] => Polarized light microscopy; collagen fibers; birefrigence; light intensity
[url] => https://link.springer.com/chapter/10.1007/978-3-030-32040-9_29
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[citace_text] => TURČANOVÁ, M.; HRTOŇ, M.; DVOŘÁK, P.; BURŠA, J. Influnce of Mutual Rotation of Polarizing Filters on Light Intensity Measured with Collagen Fibres. In VipIMAGE 2019. Porto, Portugalsko: Springer, 2019. p. 279-285. ISBN: 978-3-030-32040-9.
[citace_html] => TURČANOVÁ, M.; HRTOŇ, M.; DVOŘÁK, P.; BURŠA, J. Influnce of Mutual Rotation of Polarizing Filters on Light Intensity Measured with Collagen Fibres. In VipIMAGE 2019. Porto, Portugalsko: Springer, 2019. p. 279-285. ISBN: 978-3-030-32040-9.
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author="Michaela {Turčanová} and Martin {Hrtoň} and Petr {Viewegh} and Jiří {Burša}",
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[nazev_en] => Influnce of Mutual Rotation of Polarizing Filters on Light Intensity Measured with Collagen Fibres
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default position of the polarizer is perpendicular to the analyzer. When the light
passes through a birefringent specimen, the plane of the polarized light is rotated.
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and both filters. If the orientation of the polarizer differs from the perpendicular
direction to the analyzer, the period of light intensity changes to 180◦; one of the
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the determination of directions of collagen fibres by an automatic algorithm.
[klicova_slova_en] => Polarized light microscopy; collagen fibers; birefrigence; light intensity
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[popis] => The plastic behavior of some polycrystalline metals exhibit the Lode dependence. There are many yield criteria, which are capable of such a description. Nevertheless, these criteria predict wrongly the deformation or the stress state or both in some cases. This paper focuses on the comparison of the deformation predicted by a classical von Mises yield criterion and advanced model, which covers the Lode dependence. The comparison was carried out using the tensile tests of two types of specimens manufactured from the aluminum alloy. The numerical simulations were conducted in the Abaqus/Explicit finite element commercial code and the material models were implemented using the user subroutine.
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[klicova_slova] => Advanced plasticity; tensile test; necking; yield function; aluminum alloy
[klicova_slova_orig] => Advanced plasticity; tensile test; necking; yield function; aluminum alloy
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title="Lode dependent plasticity in the prediction of deformation states of tensile specimens",
booktitle="9th International Conference Materials Structure & Micromechanics of Fracture (MSMF9)",
year="2019",
journal="Procedia Structural Integrity",
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title="Influence of the cell geometry on the tensile strength of open-cell ceramic foams",
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[popis] => The paper investigates an asymptotic in-plane problem of clamped piezoelectric bi-material notch using the expanded Lehknitskii-Eshelby-Stroh formalism. It is established the eigenvalue problem for the regular and auxiliary solution of the problem from the boundary conditions prevailing at the notch tip where the one of the notch face is clamped. The regular as well as auxiliary solutions enter to the Ψ-integral generalized for piezoelectric bi-materials, which is used to evaluate the generalized stress intensity factors of the particular piezoelectric bi-material notch configuration.
[popis_orig] => The paper investigates an asymptotic in-plane problem of clamped piezoelectric bi-material notch using the expanded Lehknitskii-Eshelby-Stroh formalism. It is established the eigenvalue problem for the regular and auxiliary solution of the problem from the boundary conditions prevailing at the notch tip where the one of the notch face is clamped. The regular as well as auxiliary solutions enter to the Ψ-integral generalized for piezoelectric bi-materials, which is used to evaluate the generalized stress intensity factors of the particular piezoelectric bi-material notch configuration.
[klicova_slova] => piezoelectric bi-material; bi-material notch; Lekhnitchkii-Eshelby-Stroh formalism; generalised stress intensity factor;
[klicova_slova_orig] => piezoelectric bi-material; bi-material notch; Lekhnitchkii-Eshelby-Stroh formalism; generalised stress intensity factor;
[url] => https://www.sciencedirect.com/science/article/pii/S245232162030189X
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[citace_text] => HRSTKA, M.; KOTOUL, M.; PROFANT, T. Notch Tip Singularities of Elastic Piezoelectric Bi-materials. In 9th International Conference Materials Structure & Micromechanics of Fracture (MSMF9). Procedia Structural Integrity. Procedia Structural Integrity, 2019. no. special, p. 419-424. ISSN: 2452-3216.
[citace_html] => HRSTKA, M.; KOTOUL, M.; PROFANT, T. Notch Tip Singularities of Elastic Piezoelectric Bi-materials. In 9th International Conference Materials Structure & Micromechanics of Fracture (MSMF9). Procedia Structural Integrity. Procedia Structural Integrity, 2019. no. special, p. 419-424. ISSN: 2452-3216.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT162371,
author="Miroslav {Hrstka} and Michal {Kotoul} and Tomáš {Profant}",
title="Notch Tip Singularities of Elastic Piezoelectric Bi-materials",
booktitle="9th International Conference Materials Structure & Micromechanics of Fracture (MSMF9)",
year="2019",
journal="Procedia Structural Integrity",
volume="23",
number="special",
pages="419--424",
publisher="Procedia Structural Integrity",
doi="10.1016/j.prostr.2020.01.123",
url="https://www.sciencedirect.com/science/article/pii/S245232162030189X"
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[nazev_en] => Notch Tip Singularities of Elastic Piezoelectric Bi-materials
[popis_en] => The paper investigates an asymptotic in-plane problem of clamped piezoelectric bi-material notch using the expanded Lehknitskii-Eshelby-Stroh formalism. It is established the eigenvalue problem for the regular and auxiliary solution of the problem from the boundary conditions prevailing at the notch tip where the one of the notch face is clamped. The regular as well as auxiliary solutions enter to the Ψ-integral generalized for piezoelectric bi-materials, which is used to evaluate the generalized stress intensity factors of the particular piezoelectric bi-material notch configuration.
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[popis] => Increasing demand in SATCOM systems has led to the development of Satcom on the Move (SOTM) antennas. Performance, light weight, low cost, and high data rate are the required parameters in the designing of SOTM antenna. The designer has to make a suitable system with respect to these design parameters. With this aim, this paper proposes a 4 axes antenna capable of 3 axes stabilization to compensate for the disturbance. With adding the position controller, the antenna can point and track the satellite on the mobile platforms. Due to the singularity problem in this type of antenna, the 3 axes stabilized antenna system is used in this paper. The kinematic equations and Jacobian operator are derived for calculation of the necessary axis feedback and look angles. The Jacobian operator with MEMS sensor which is a cost-effective solution. Furthermore, we propose PI-based stabilization for the stabilization controller and PID based pointing for the position controller. To verify the proposed algorithms, different disturbances are applied to the system.
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[citace_text] => CELIK, M.; HANCIOGLU, O.; BOGOSYAN, S.; BASTL, M.; NAJMAN, J.; GREPL, R. Cascade Control of SATCOM on the Move (SOTM) Antennas with Jacobian Operator. In 2019 IEEE 7th International Conference on Control, Mechatronics and Automation ICCMA 2019. Delft,Nizozemsko: IEEE, 2020. p. 416-422. ISBN: 978-1-7281-3787-2.
[citace_html] => CELIK, M.; HANCIOGLU, O.; BOGOSYAN, S.; BASTL, M.; NAJMAN, J.; GREPL, R. Cascade Control of SATCOM on the Move (SOTM) Antennas with Jacobian Operator. In 2019 IEEE 7th International Conference on Control, Mechatronics and Automation ICCMA 2019. Delft,Nizozemsko: IEEE, 2020. p. 416-422. ISBN: 978-1-7281-3787-2.
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author="Mustafa {Celik} and Oguz Kaan {Hancioglu} and Seta {Bogosyan} and Michal {Bastl} and Jan {Najman} and Robert {Grepl}",
title="Cascade Control of SATCOM on the Move (SOTM) Antennas with Jacobian Operator",
booktitle="2019 IEEE 7th International Conference on Control, Mechatronics and Automation ICCMA 2019",
year="2020",
pages="416--422",
publisher="IEEE",
address="Delft,Nizozemsko",
doi="10.1109/ICCMA46720.2019.8988673",
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url="http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8988673&isnumber=8988591"
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[popis] => Auxetická struktura s elektromechanickou přeměnu vnějšího silového působení v jednom směru je tvořena vzájemně přesazenými řadami (1) tuhých stojin (2) proložených ohebnou membránou (3) stlačenou mezi dvěma stojinami (2) téže řady stojinou (2) sousední řady (1). Přitom stojiny (2) jsou opatřeny v polovině délky dvěma rameny (5) vyčnívajícími kolmo v opačném směru proti sousedním stojinám (2). Mezi rameny (5) sousedních stojin (2) v řadě (1) je vložen element (6) ke zprostředkování elektromechanické přeměny, kterým může být piezoelektrický blok (7) opatřený elektrodami, piezoelektrický blok (7) ve formě vrstveného stacku (10) a/nebo magnetostrikční blok (11) ovinutý cívkou, případně umístěný mezi permanentními magnety.
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[citace_text] => HADAŠ, Z.; Vysoké učení technické v Brně, Brno, CZ: Auxetická struktura s elektromechanickou přeměnou. 308206, Patent. (2020)
[citace_html] => HADAŠ, Z.; Vysoké učení technické v Brně, Brno, CZ: Auxetická struktura s elektromechanickou přeměnou. 308206, Patent. (2020)
[citace_rtf] =>
[citace_bibtex] => @misc{BUT162746,
author="Zdeněk {Hadaš}",
title="Auxetická struktura s elektromechanickou přeměnou",
year="2020",
note="Patent"
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[poznamka_metriky] =>
[nazev_en] => Auxetic structure with electromechanical conversion
[popis_en] => Auxetic structure with electromechanical conversion of loads into useful electrical signal. This structure consist of rigid element with flexible membranes and systems of smart materials. Systems of smart materials could be in form of piezoelectric stack, piezoelectric bulk or magnetostriction system with coil.
[klicova_slova_en] => Vibration, Auxetic Structure, Smart materials
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[nazev] => Modelling of impact behaviour of European beech subjected to split Hopkinson pressure bar test
[nazev_orig] => Modelling of impact behaviour of European beech subjected to split Hopkinson pressure bar test
[duvernost_udaju_id] => S
[popis] => The hardwood, as a natural composite, may be subjected to the dynamic loading in many applications, such as the high-speed disintegration or structural collapses. The correct material description is needed for finite element modelling that can take place in the design stages of wood manufacturing processes or building the wooden structures. The split Hopkinson pressure (Kolsky) bar test provides the data for high strain rates. The experiments were carried out on the European beech wood in all the principal loading directions. The tests were repeated computationally in order to obtain the material constants of the complex material model, which covered the anisotropy of elasticity, plasticity as well as fracture behaviour. Moreover, the failure was considered non-symmetric with respect to the tension and compression. This was achieved by incorporating the stress triaxiality dependency into the failure model. The crack initiation and propagation were realized through the element deletion technique within LS-DYNA code. The real behaviour was captured quite well including the pulses in the incident and transmission bars.
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[klicova_slova] => Explicit code; Elastic wave propagation; Shock wave; Blast loading; Cellular material; Crashworthiness
[klicova_slova_orig] => Explicit code; Elastic wave propagation; Shock wave; Blast loading; Cellular material; Crashworthiness
[url] => https://www.sciencedirect.com/science/article/pii/S0263822320302245
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[identifikator] => ISSN 0263-8223
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[citace_text] => ŠEBEK, F.; KUBÍK, P.; BRABEC, M.; TIPPNER, J. Modelling of impact behaviour of European beech subjected to split Hopkinson pressure bar test. Composite structures, 2020, vol. 245, no. 1, p. 1-11. ISSN: 0263-8223.
[citace_html] => ŠEBEK, F.; KUBÍK, P.; BRABEC, M.; TIPPNER, J. Modelling of impact behaviour of European beech subjected to split Hopkinson pressure bar test. Composite structures, 2020, vol. 245, no. 1, p. 1-11. ISSN: 0263-8223.
[citace_rtf] =>
[citace_bibtex] => @article{BUT163403,
author="František {Šebek} and Petr {Kubík} and Martin {Brabec} and Jan {Tippner}",
title="Modelling of impact behaviour of European beech subjected to split Hopkinson pressure bar test",
journal="Composite structures",
year="2020",
volume="245",
number="1",
pages="1--11",
doi="10.1016/j.compstruct.2020.112330",
issn="0263-8223",
url="https://www.sciencedirect.com/science/article/pii/S0263822320302245"
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[nazev_en] => Modelling of impact behaviour of European beech subjected to split Hopkinson pressure bar test
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[klicova_slova_en] => Explicit code; Elastic wave propagation; Shock wave; Blast loading; Cellular material; Crashworthiness
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[nazev] => An easy and engineering stability criterion of general singular stress concentrators
[nazev_orig] => An easy and engineering stability criterion of general singular stress concentrators
[duvernost_udaju_id] => S
[popis] => General singular stress concentrators often occur in engineering components and they represent places prone to crack initiation. Estimation of crack initiation conditions is usually performed by means of stability criteria of generalized fracture mechanics. These stability criteria require knowledge of asymptotic description of the stress state around the general singular stress concentrator. In cases of some concentrators, this analytical-numerical description can be quite difficult and does not belong among straightforward engineering approaches. This paper introduces an easy and engineering way to assess conditions for crack initiation and propagation in general singular stress concentrators using standard numerical approaches. The paper handles well-known criteria of generalized fracture mechanics of sharp and bi-material notches and simplifies them to a practical form usable for engineers. The resulting criterion fits the frame of criteria of finite fracture mechanics and extends their applicability.
[popis_orig] => General singular stress concentrators often occur in engineering components and they represent places prone to crack initiation. Estimation of crack initiation conditions is usually performed by means of stability criteria of generalized fracture mechanics. These stability criteria require knowledge of asymptotic description of the stress state around the general singular stress concentrator. In cases of some concentrators, this analytical-numerical description can be quite difficult and does not belong among straightforward engineering approaches. This paper introduces an easy and engineering way to assess conditions for crack initiation and propagation in general singular stress concentrators using standard numerical approaches. The paper handles well-known criteria of generalized fracture mechanics of sharp and bi-material notches and simplifies them to a practical form usable for engineers. The resulting criterion fits the frame of criteria of finite fracture mechanics and extends their applicability.
[klicova_slova] => Fracture mechanics; Stability criterion; Crack initiation; General singular stress concentrator; Controlling quantity
[klicova_slova_orig] => Fracture mechanics; Stability criterion; Crack initiation; General singular stress concentrator; Controlling quantity
[url] => https://www.sciencedirect.com/science/article/pii/S0167844219301077
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[originalni_jazyk] => en
[schvalil_id] => 16217
[schvaleno] => 2020-04-16
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[vycet_osob] => KLUSÁK, J.; KREPL, O.; PROFANT, T.
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[citace_text] => KLUSÁK, J.; KREPL, O.; PROFANT, T. An easy and engineering stability criterion of general singular stress concentrators. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2019, vol. 104, no. 1, p. 102341-102352. ISSN: 0167-8442.
[citace_html] => KLUSÁK, J.; KREPL, O.; PROFANT, T. An easy and engineering stability criterion of general singular stress concentrators. THEORETICAL AND APPLIED FRACTURE MECHANICS, 2019, vol. 104, no. 1, p. 102341-102352. ISSN: 0167-8442.
[citace_rtf] =>
[citace_bibtex] => @article{BUT163540,
author="Jan {Klusák} and Ondřej {Krepl} and Tomáš {Profant}",
title="An easy and engineering stability criterion of general singular stress concentrators",
journal="THEORETICAL AND APPLIED FRACTURE MECHANICS",
year="2019",
volume="104",
number="1",
pages="102341--102352",
doi="10.1016/j.tafmec.2019.102341",
issn="0167-8442",
url="https://www.sciencedirect.com/science/article/pii/S0167844219301077"
}
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[nazev_en] => An easy and engineering stability criterion of general singular stress concentrators
[popis_en] => General singular stress concentrators often occur in engineering components and they represent places prone to crack initiation. Estimation of crack initiation conditions is usually performed by means of stability criteria of generalized fracture mechanics. These stability criteria require knowledge of asymptotic description of the stress state around the general singular stress concentrator. In cases of some concentrators, this analytical-numerical description can be quite difficult and does not belong among straightforward engineering approaches. This paper introduces an easy and engineering way to assess conditions for crack initiation and propagation in general singular stress concentrators using standard numerical approaches. The paper handles well-known criteria of generalized fracture mechanics of sharp and bi-material notches and simplifies them to a practical form usable for engineers. The resulting criterion fits the frame of criteria of finite fracture mechanics and extends their applicability.
[klicova_slova_en] => Fracture mechanics; Stability criterion; Crack initiation; General singular stress concentrator; Controlling quantity
[vysledek_datum] => 2019-12-01T00:00:00+01:00
)
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[nazev] => Computational investigation of the impact of assumption of affine deformation on constitutive models of soft tissues
[nazev_orig] => Computational investigation of the impact of assumption of affine deformation on constitutive models of soft tissues
[duvernost_udaju_id] => S
[popis] => All constitutive models proposed during the last decades for large strain composites with hyperelastic matrix use an intrinsic assumption of affine deformation between the matrix and reinforcing fibres. While for typical technical composites the affinity of deformation between fibres and matrix till high loads is ensured by targeted creation of their chemical bonds, this need not to be the case with soft biological tissues. For instance, this assumption might be disputable for arterial tissues with their matrix consisting of very compliant gel-like proteoglycans. On the other hand, no constitutive model proposed till now has been capable to give a reasonable fit of all mechanical tests of some pathological tissues with low initial stiffness, such as aortic aneurysm wall. Thus, a question occurs whether this discrepancy could not be caused by the intrinsic assumption of affine deformation used in all models. To test the impact of this assumption on the simulated response in some mechanical tests, two finite element models of specimens of arterial tissues were created, both including matrix and fibres separately. The former model mimicked the affine deformation of matrix and fibres by merging all the nodes of both components, while the deformation of fibres was independent of the matrix in the latter model, with exception of both fibre ends. Differences in reaction forces of specimens were evaluated in various strain states and directions with respect to the orientation of fibres. The evaluated differences between models with affine and non-affine deformations were significant but smaller than typical inaccuracies of constitutive models when fitting aortic aneurysm tissues.
[popis_orig] => All constitutive models proposed during the last decades for large strain composites with hyperelastic matrix use an intrinsic assumption of affine deformation between the matrix and reinforcing fibres. While for typical technical composites the affinity of deformation between fibres and matrix till high loads is ensured by targeted creation of their chemical bonds, this need not to be the case with soft biological tissues. For instance, this assumption might be disputable for arterial tissues with their matrix consisting of very compliant gel-like proteoglycans. On the other hand, no constitutive model proposed till now has been capable to give a reasonable fit of all mechanical tests of some pathological tissues with low initial stiffness, such as aortic aneurysm wall. Thus, a question occurs whether this discrepancy could not be caused by the intrinsic assumption of affine deformation used in all models. To test the impact of this assumption on the simulated response in some mechanical tests, two finite element models of specimens of arterial tissues were created, both including matrix and fibres separately. The former model mimicked the affine deformation of matrix and fibres by merging all the nodes of both components, while the deformation of fibres was independent of the matrix in the latter model, with exception of both fibre ends. Differences in reaction forces of specimens were evaluated in various strain states and directions with respect to the orientation of fibres. The evaluated differences between models with affine and non-affine deformations were significant but smaller than typical inaccuracies of constitutive models when fitting aortic aneurysm tissues.
[klicova_slova] => fibre composite, hyperelastic matrix, finite element analyses, affine deformation, soft tissue
[klicova_slova_orig] => fibre composite, hyperelastic matrix, finite element analyses, affine deformation, soft tissue
[url] => https://www.kme.zcu.cz/acm/acm/article/view/477
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[kod_doi] => 10.24132/acm.2019.477
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[citace_text] => BURŠA, J.; SLAŽANSKÝ, M. Computational investigation of the impact of assumption of affine deformation on constitutive models of soft tissues. Applied andComputational Mechanics, 2019, vol. 13, no. 2, p. 99-106. ISSN: 1802-680X.
[citace_html] => BURŠA, J.; SLAŽANSKÝ, M. Computational investigation of the impact of assumption of affine deformation on constitutive models of soft tissues. Applied andComputational Mechanics, 2019, vol. 13, no. 2, p. 99-106. ISSN: 1802-680X.
[citace_rtf] =>
[citace_bibtex] => @article{BUT163682,
author="Jiří {Burša} and Martin {Slažanský}",
title="Computational investigation of the impact of assumption of affine deformation on constitutive models of soft tissues",
journal="Applied andComputational Mechanics",
year="2019",
volume="13",
number="2",
pages="99--106",
doi="10.24132/acm.2019.477",
issn="1802-680X",
url="https://www.kme.zcu.cz/acm/acm/article/view/477"
}
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[oecd_tree_podobor_nazev] => Biophysics
[poznamka_metriky] =>
[nazev_en] => Computational investigation of the impact of assumption of affine deformation on constitutive models of soft tissues
[popis_en] => All constitutive models proposed during the last decades for large strain composites with hyperelastic matrix use an intrinsic assumption of affine deformation between the matrix and reinforcing fibres. While for typical technical composites the affinity of deformation between fibres and matrix till high loads is ensured by targeted creation of their chemical bonds, this need not to be the case with soft biological tissues. For instance, this assumption might be disputable for arterial tissues with their matrix consisting of very compliant gel-like proteoglycans. On the other hand, no constitutive model proposed till now has been capable to give a reasonable fit of all mechanical tests of some pathological tissues with low initial stiffness, such as aortic aneurysm wall. Thus, a question occurs whether this discrepancy could not be caused by the intrinsic assumption of affine deformation used in all models. To test the impact of this assumption on the simulated response in some mechanical tests, two finite element models of specimens of arterial tissues were created, both including matrix and fibres separately. The former model mimicked the affine deformation of matrix and fibres by merging all the nodes of both components, while the deformation of fibres was independent of the matrix in the latter model, with exception of both fibre ends. Differences in reaction forces of specimens were evaluated in various strain states and directions with respect to the orientation of fibres. The evaluated differences between models with affine and non-affine deformations were significant but smaller than typical inaccuracies of constitutive models when fitting aortic aneurysm tissues.
[klicova_slova_en] => fibre composite, hyperelastic matrix, finite element analyses, affine deformation, soft tissue
[vysledek_datum] => 2019-09-23T00:00:00+02:00
)
[10] => Array
(
[vysledek_id] => 163683
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[nazev] => Impact of Decreased Transmural Conduction Velocity on the Function of the Human Left Ventricle: A Simulation Study
[nazev_orig] => Impact of Decreased Transmural Conduction Velocity on the Function of the Human Left Ventricle: A Simulation Study
[duvernost_udaju_id] => S
[popis] => This study investigates the impact of reduced transmural conduction velocity (TCV) on output parameters of the human heart. In a healthy heart, the TCV contributes to synchronization of the onset of contraction in individual layers of the left ventricle (LV). However, it is unclear whether the clinically observed decrease of TCV contributes significantly to a reduction of LV contractility. The applied three-dimensional finite element model of isovolumic contraction of the human LV incorporates transmural gradients in electromechanical delay and myocyte shortening velocity and evaluates the impact of TCV reduction on pressure rise (namely, (dP/dt)(max)) and on isovolumic contraction duration (IVCD) in a healthy LV. The model outputs are further exploited in the lumped “Windkessel” model of the human cardiovascular system (based on electrohydrodynamic analogy of respective differential equations) to simulate the impact of changes of (dP/dt)(max) and IVCD on chosen systemic parameters (ejection fraction, LV power, cardiac output, and blood pressure). The simulations have shown that a 50% decrease in TCV prolongs substantially the isovolumic contraction, decelerates slightly the LV pressure rise, increases the LV energy consumption, and reduces the LV power. These negative effects increase progressively with further reduction of TCV. In conclusion, these results suggest that the pumping efficacy of the human LV decreases with lower TCV due to a higher energy consumption and lower LV power. Although the changes induced by the clinically relevant reduction of TCV are not critical for a healthy heart, they may represent an important factor limiting the heart function under disease conditions.
[popis_orig] => This study investigates the impact of reduced transmural conduction velocity (TCV) on output parameters of the human heart. In a healthy heart, the TCV contributes to synchronization of the onset of contraction in individual layers of the left ventricle (LV). However, it is unclear whether the clinically observed decrease of TCV contributes significantly to a reduction of LV contractility. The applied three-dimensional finite element model of isovolumic contraction of the human LV incorporates transmural gradients in electromechanical delay and myocyte shortening velocity and evaluates the impact of TCV reduction on pressure rise (namely, (dP/dt)(max)) and on isovolumic contraction duration (IVCD) in a healthy LV. The model outputs are further exploited in the lumped “Windkessel” model of the human cardiovascular system (based on electrohydrodynamic analogy of respective differential equations) to simulate the impact of changes of (dP/dt)(max) and IVCD on chosen systemic parameters (ejection fraction, LV power, cardiac output, and blood pressure). The simulations have shown that a 50% decrease in TCV prolongs substantially the isovolumic contraction, decelerates slightly the LV pressure rise, increases the LV energy consumption, and reduces the LV power. These negative effects increase progressively with further reduction of TCV. In conclusion, these results suggest that the pumping efficacy of the human LV decreases with lower TCV due to a higher energy consumption and lower LV power. Although the changes induced by the clinically relevant reduction of TCV are not critical for a healthy heart, they may represent an important factor limiting the heart function under disease conditions.
[klicova_slova] => heart contraction, left ventricle, finite element model, blood circuit simulation, conduction velocity
[klicova_slova_orig] => heart contraction, left ventricle, finite element model, blood circuit simulation, conduction velocity
[url] => https://www.hindawi.com/journals/bmri/2020/2867865/
[oecd_obor_id] => 20801
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[odpovedny_utvar_nazev] => Institute of Solid Mechanics, Mechatronics and Biomechanics
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[nadrazena_soucast_zkratka] => FME
[nadrazena_soucast_nazev] => Faculty of Mechanical Engineering
[originalni_jazyk] => en
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[schvaleno] => 2021-02-05
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[vycet_osob] => VAVERKA, J.; MOUDR, J.; LOKAJ, P.; BURŠA, J.; PÁSEK, M.
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[kategorie_nazev] => Publication results
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[druh_popis] => Peer-reviewed article included in Web of Science database as as an “Article”, “Review” or “Letter”
[stav] => Approved
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[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
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[identifikator] => ISSN 2314-6133
[identifikator_popis] => ISSN - Biomed Research International (GB)
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[riv_dodavka_oznaceni] => RIV21-MSM-26210___
[riv_dodavka_rok] => 2021
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[citace_text] => VAVERKA, J.; MOUDR, J.; LOKAJ, P.; BURŠA, J.; PÁSEK, M. Impact of Decreased Transmural Conduction Velocity on the Function of the Human Left Ventricle: A Simulation Study. Biomed Research International, 2020, vol. 2020, no. 1, p. 1-11. ISSN: 2314-6133.
[citace_html] => VAVERKA, J.; MOUDR, J.; LOKAJ, P.; BURŠA, J.; PÁSEK, M. Impact of Decreased Transmural Conduction Velocity on the Function of the Human Left Ventricle: A Simulation Study. Biomed Research International, 2020, vol. 2020, no. 1, p. 1-11. ISSN: 2314-6133.
[citace_rtf] =>
[citace_bibtex] => @article{BUT163683,
author="Jiří {Vaverka} and Jiří {Moudr} and Petr {Lokaj} and Jiří {Burša} and Michal {Pásek}",
title="Impact of Decreased Transmural Conduction Velocity on the Function of the Human Left Ventricle: A Simulation Study",
journal="Biomed Research International",
year="2020",
volume="2020",
number="1",
pages="1--11",
doi="10.1155/2020/2867865",
issn="2314-6133",
url="https://www.hindawi.com/journals/bmri/2020/2867865/"
}
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[poznamka_metriky] =>
[nazev_en] => Impact of Decreased Transmural Conduction Velocity on the Function of the Human Left Ventricle: A Simulation Study
[popis_en] => This study investigates the impact of reduced transmural conduction velocity (TCV) on output parameters of the human heart. In a healthy heart, the TCV contributes to synchronization of the onset of contraction in individual layers of the left ventricle (LV). However, it is unclear whether the clinically observed decrease of TCV contributes significantly to a reduction of LV contractility. The applied three-dimensional finite element model of isovolumic contraction of the human LV incorporates transmural gradients in electromechanical delay and myocyte shortening velocity and evaluates the impact of TCV reduction on pressure rise (namely, (dP/dt)(max)) and on isovolumic contraction duration (IVCD) in a healthy LV. The model outputs are further exploited in the lumped “Windkessel” model of the human cardiovascular system (based on electrohydrodynamic analogy of respective differential equations) to simulate the impact of changes of (dP/dt)(max) and IVCD on chosen systemic parameters (ejection fraction, LV power, cardiac output, and blood pressure). The simulations have shown that a 50% decrease in TCV prolongs substantially the isovolumic contraction, decelerates slightly the LV pressure rise, increases the LV energy consumption, and reduces the LV power. These negative effects increase progressively with further reduction of TCV. In conclusion, these results suggest that the pumping efficacy of the human LV decreases with lower TCV due to a higher energy consumption and lower LV power. Although the changes induced by the clinically relevant reduction of TCV are not critical for a healthy heart, they may represent an important factor limiting the heart function under disease conditions.
[klicova_slova_en] => heart contraction, left ventricle, finite element model, blood circuit simulation, conduction velocity
[vysledek_datum] => 2020-04-04T00:00:00+02:00
)
[11] => Array
(
[vysledek_id] => 163776
[vysledek_druh_id] => CONPA
[ex_vysledek_id] => 136360
[vysledek_rok] => 2020
[nazev] => Prediction of the ceramic foam structure failure using a detailed finite element model
[nazev_orig] => Prediction of the ceramic foam structure failure using a detailed finite element model
[duvernost_udaju_id] => S
[popis] => The contribution deals with modelling and prediction of failure of mechanically loaded open cell ceramic foam structures by using 3D volume FE models constructed from CT scans of real foam specimens. The condition for crack initiation in particular struts comes from the coupled stress-energy criterion which combines two fracture-mechanics parameters of the investigated material – tensile strength and its fracture toughness. By combining of both stress and energy condition one obtains information about the crack initiation length which is later used (together with the tensile strength) for determination of the strut failure in the complex 3D FE model of the ceramic foam structure. The crack onset is considered in the critical location at the moment when the (tensile) principal stress under the strut surface (in a depth corresponding to the crack initiation length) exceeded the tensile strength of the strut. Such approach enables us to define failure also on relatively coarse meshes of the FE models where potential stress concentrations are not described precisely and therefore it is not possible to decide about the failure just based upon the value of tensile stress on the strut surface.
[popis_orig] => The contribution deals with modelling and prediction of failure of mechanically loaded open cell ceramic foam structures by using 3D volume FE models constructed from CT scans of real foam specimens. The condition for crack initiation in particular struts comes from the coupled stress-energy criterion which combines two fracture-mechanics parameters of the investigated material – tensile strength and its fracture toughness. By combining of both stress and energy condition one obtains information about the crack initiation length which is later used (together with the tensile strength) for determination of the strut failure in the complex 3D FE model of the ceramic foam structure. The crack onset is considered in the critical location at the moment when the (tensile) principal stress under the strut surface (in a depth corresponding to the crack initiation length) exceeded the tensile strength of the strut. Such approach enables us to define failure also on relatively coarse meshes of the FE models where potential stress concentrations are not described precisely and therefore it is not possible to decide about the failure just based upon the value of tensile stress on the strut surface.
[klicova_slova] => Ceramic foam;Coupled criterion;Crack;FE model;FEM;Finite Fracture Mechanics
[klicova_slova_orig] => Ceramic foam;Coupled criterion;Crack;FE model;FEM;Finite Fracture Mechanics
[url] => https://www.scientific.net/KEM.827.222
[oecd_obor_id] => 20302
[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] => 142155
[schvaleno] => 2021-02-14
[vykazovat_riv] => 1
[vykazovat_riv_zmeny] => 1
[slozka_id] =>
[posledni_diagnostika] =>
[vycet_osob] => ŠEVEČEK, O.; HANÁK, J.; MAJER, Z.; DRDLÍK, D.; CHLUP, Z.; KOTOUL, M.
[pocet_tvurcu] => 6
[tvurci_ids] =>
[poznamka] =>
[typ_nazev] =>
[kod_doi] => 10.4028/www.scientific.net/KEM.827.222
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[pocet_zaznamu] =>
[zverejneno] => 1
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[korespondencni_autor] =>
[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
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[upd_uid] => 999999
[ins_ts] => 2025-09-22
[upd_ts] => 2025-09-22
[status] => 9
[identifikator] => ISBN 9783035715866 ISSN 1013-9826
[identifikator_popis] => ISBN - Advances in Fracture and Damage Mechanics XVIII ISSN - Key Engineering Materials (print) (CH)
[riv_dodavka_id] => 2549
[riv_dodavka_oznaceni] => RIV21-MSM-26210___
[riv_dodavka_rok] => 2021
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[citace_text] => ŠEVEČEK, O.; HANÁK, J.; MAJER, Z.; DRDLÍK, D.; CHLUP, Z.; KOTOUL, M. Prediction of the ceramic foam structure failure using a detailed finite element model. In Advances in Fracture and Damage Mechanics XVIII. Key Engineering Materials (print). 1. Švýcarsko: Trans Tech Publications Ltd, 2020. no. 827, p. 222-227. ISBN: 9783035715866. ISSN: 1013-9826.
[citace_html] => ŠEVEČEK, O.; HANÁK, J.; MAJER, Z.; DRDLÍK, D.; CHLUP, Z.; KOTOUL, M. Prediction of the ceramic foam structure failure using a detailed finite element model. In Advances in Fracture and Damage Mechanics XVIII. Key Engineering Materials (print). 1. Švýcarsko: Trans Tech Publications Ltd, 2020. no. 827, p. 222-227. ISBN: 9783035715866. ISSN: 1013-9826.
[citace_rtf] =>
[citace_bibtex] => @inproceedings{BUT163776,
author="Oldřich {Ševeček} and Jiří {Hanák} and Zdeněk {Majer} and Daniel {Drdlík} and Zdeněk {Chlup} and Michal {Kotoul}",
title="Prediction of the ceramic foam structure failure using a detailed finite element model",
booktitle="Advances in Fracture and Damage Mechanics XVIII",
year="2020",
series="1",
journal="Key Engineering Materials (print)",
volume="1",
number="827",
pages="222--227",
publisher="Trans Tech Publications Ltd",
address="Švýcarsko",
doi="10.4028/www.scientific.net/KEM.827.222",
isbn="9783035715866",
issn="1013-9826",
url="https://www.scientific.net/KEM.827.222"
}
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[oecd_tree_oblast_nazev] => 2. Engineering and Technology
[oecd_tree_obor_id] => 20300
[oecd_tree_obor_nazev] => 2.3 Mechanical engineering
[oecd_tree_podobor_id] => 20302
[oecd_tree_podobor_nazev] => Applied mechanics
[poznamka_metriky] =>
[nazev_en] => Prediction of the ceramic foam structure failure using a detailed finite element model
[popis_en] => The contribution deals with modelling and prediction of failure of mechanically loaded open cell ceramic foam structures by using 3D volume FE models constructed from CT scans of real foam specimens. The condition for crack initiation in particular struts comes from the coupled stress-energy criterion which combines two fracture-mechanics parameters of the investigated material – tensile strength and its fracture toughness. By combining of both stress and energy condition one obtains information about the crack initiation length which is later used (together with the tensile strength) for determination of the strut failure in the complex 3D FE model of the ceramic foam structure. The crack onset is considered in the critical location at the moment when the (tensile) principal stress under the strut surface (in a depth corresponding to the crack initiation length) exceeded the tensile strength of the strut. Such approach enables us to define failure also on relatively coarse meshes of the FE models where potential stress concentrations are not described precisely and therefore it is not possible to decide about the failure just based upon the value of tensile stress on the strut surface.
[klicova_slova_en] => Ceramic foam;Coupled criterion;Crack;FE model;FEM;Finite Fracture Mechanics
[vysledek_datum] => 2020-02-01T00:00:00+01:00
)
[12] => Array
(
[vysledek_id] => 164306
[vysledek_druh_id] => CONPA
[ex_vysledek_id] => 136685
[vysledek_rok] => 2020
[nazev] => Influencing the Indentation Curves by the Bluntness of the Berkovich Indenter at the Fem Modelling
[nazev_orig] => Influencing the Indentation Curves by the Bluntness of the Berkovich Indenter at the Fem Modelling
[duvernost_udaju_id] => S
[popis] => The influence of the Berkovich indenter bluntness on the indentation curves at nanoindentation test of fused silica is determined by the FEM (finite element method) in this paper. The Berkovich indenter, which is mostly used for the nanoindentation test, was assumed for calculations. The indenter is always blunted in real tests. The bluntness of the indenter has an influence on the results of the nanoindentation test. The combination of the nanoindentation test and the FE modelling can be used for the calculation of the parameters of fused silica plasticity and estimation of the bluntness of the indenter. In this paper, the FEM was used for calculating of the indentation curves. Two cases of bluntness were assumed. The curves for ideally sharp or blunted indenter were determined. The results of these calculations showed that the indentation curves are dependent on the bluntness of the Berkovich indenter. The greatest relative influence of the nanoindentation curves by the bluntness is in the area of small values of the indenter displacement. The impact of assuming blunted indenter to calculated parameters of plasticity was assessed. It is often difficult to measure the bluntness of the indenter but it has an influence on the results of the nanoindentation test and should be included into calculations to make it more precise.
[popis_orig] => The influence of the Berkovich indenter bluntness on the indentation curves at nanoindentation test of fused silica is determined by the FEM (finite element method) in this paper. The Berkovich indenter, which is mostly used for the nanoindentation test, was assumed for calculations. The indenter is always blunted in real tests. The bluntness of the indenter has an influence on the results of the nanoindentation test. The combination of the nanoindentation test and the FE modelling can be used for the calculation of the parameters of fused silica plasticity and estimation of the bluntness of the indenter. In this paper, the FEM was used for calculating of the indentation curves. Two cases of bluntness were assumed. The curves for ideally sharp or blunted indenter were determined. The results of these calculations showed that the indentation curves are dependent on the bluntness of the Berkovich indenter. The greatest relative influence of the nanoindentation curves by the bluntness is in the area of small values of the indenter displacement. The impact of assuming blunted indenter to calculated parameters of plasticity was assessed. It is often difficult to measure the bluntness of the indenter but it has an influence on the results of the nanoindentation test and should be included into calculations to make it more precise.
[klicova_slova] => Berkovich indenter, bluntness, finite element method, nanoindentation
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[citace_text] => KOVÁŘ, J.; FUIS, V.; TOMÁŠTÍK, J. Influencing the Indentation Curves by the Bluntness of the Berkovich Indenter at the Fem Modelling. In Proceedings of the 14th international conference on local mechanical properties - LMP 2019. Acta Polytechnica CTU Proceedings. Praha: Acta polytechnica CTU proceedings, 2020. no. 1, p. 131-135. ISBN: 978-80-01-06735-2. ISSN: 2336-5382.
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author="Jaroslav {Kovář} and Vladimír {Fuis} and Jan {Tomáštík}",
title="Influencing the Indentation Curves by the Bluntness of the Berkovich Indenter at the Fem Modelling",
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year="2020",
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