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@article{2239427,
author = {Fischer, Jiří and Turčanová, Michaela and Man, Vojtěch and Hermanová, Markéta and Bednařík, Zdeněk and Burša, Jiří},
article_location = {AMSTERDAM},
article_number = {February 2023},
doi = {http://dx.doi.org/10.1016/j.jmbbm.2022.105615},
keywords = {Soft tissue; Collagen; Fibre direction; Polarized light microscopy; Histogram; Constitutive modelling},
language = {eng},
issn = {1751-6161},
journal = {Journal of the Mechanical Behavior of Biomedical Materials},
title = {Importance of experimental evaluation of structural parameters for constitutive modelling of aorta},
url = {https://www.sciencedirect.com/science/article/pii/S1751616122005203?via%3Dihub},
volume = {138},
year = {2023}
}
TY - JOUR
ID - 2239427
AU - Fischer, Jiří - Turčanová, Michaela - Man, Vojtěch - Hermanová, Markéta - Bednařík, Zdeněk - Burša, Jiří
PY - 2023
TI - Importance of experimental evaluation of structural parameters for constitutive modelling of aorta
JF - Journal of the Mechanical Behavior of Biomedical Materials
VL - 138
IS - February 2023
SP - 1-8
EP - 1-8
PB - ELSEVIER
SN - 17516161
KW - Soft tissue
KW - Collagen
KW - Fibre direction
KW - Polarized light microscopy
KW - Histogram
KW - Constitutive modelling
UR - https://www.sciencedirect.com/science/article/pii/S1751616122005203?via%3Dihub
N2 - The study compares stresses and strains in the aortic wall derived using different constitutive models for various stress-strain conditions. Structure-based constitutive models with two fibre families with (GOH) and without (HGO) dispersion of collagen fibres are compared. The constitutive models were fitted to data from equibiaxial tension tests of two separated layers of the porcine aortic wall. The initial fit was evaluated with unrestricted parameters and subsequently, the mean angles of the fibre families and the angular dispersion were fixed to the values obtained from histology. Surprisingly, none of the tested models was capable to provide a good quality fit with histologically obtained structural parameters. Fitting the HGO model to experimental data resulted in two fibre families under angles close to ±45°, while the GOH model resulted in a nearly isotropic fibre distribution. These results indicate that both of these models suffer from the absence of isotropic strain stiffening. After having modified both models with corresponding additional members based on the Yeoh model of matrix, we obtained a perfect fit to the measured data while keeping the structural histology-based parameters. Finally, significant differences in compliance and resulting stresses and strains between different models are shown by means of simulations of uniaxial tension test, equibiaxial tension tests and inflation of the aorta.
ER -
FISCHER, Jiří, Michaela TURČANOVÁ, Vojtěch MAN, Markéta HERMANOVÁ, Zdeněk BEDNAŘÍK and Jiří BURŠA. Importance of experimental evaluation of structural parameters for constitutive modelling of aorta. \textit{Journal of the Mechanical Behavior of Biomedical Materials}. AMSTERDAM: ELSEVIER, 2023, vol.~138, February 2023, p.~1-8. ISSN~1751-6161. Available from: https://dx.doi.org/10.1016/j.jmbbm.2022.105615.
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