Publication detail
Need for transverse strain data for fitting constitutive models of arterial tissue to uniaxial tests
SKÁCEL, P. BURŠA, J.
English title
Need for transverse strain data for fitting constitutive models of arterial tissue to uniaxial tests
Type
journal article in Web of Science
Language
en
Original abstract
The study deals with the process of estimation of material parameters from uniaxial test data of arterial tissue and focuses on the role of transverse strains. Two fitting strategies are analyzed and their impact on the predictive and descriptive capabilities of the resulting model is evaluated. The standard fitting procedure (strategy A) based on longitudinal stress-strain curves is compared with the enhanced approach (strategy B) taking also the transverse strain test data into account. The study is performed on a large set of material data adopted from literature and for a variety of constitutive models developed for fibrous soft tissues. The standard procedure (A) ignoring the transverse strain test data is found rather hazardous, leading often to unrealistic predictions of the model exhibiting auxetic behaviour. In contrast, the alternative fitting method (B) ensures a realistic strain response of the model and is proved to be superior since it does not require any significant demands of computational effort or additional testing. The results presented in this paper show that even the artificial transverse strain data (i.e., not measured during testing but generated ex post, based on assumed Poisson’s ratio) are much less hazardous than total disregard of the transverse strain response.
English abstract
The study deals with the process of estimation of material parameters from uniaxial test data of arterial tissue and focuses on the role of transverse strains. Two fitting strategies are analyzed and their impact on the predictive and descriptive capabilities of the resulting model is evaluated. The standard fitting procedure (strategy A) based on longitudinal stress-strain curves is compared with the enhanced approach (strategy B) taking also the transverse strain test data into account. The study is performed on a large set of material data adopted from literature and for a variety of constitutive models developed for fibrous soft tissues. The standard procedure (A) ignoring the transverse strain test data is found rather hazardous, leading often to unrealistic predictions of the model exhibiting auxetic behaviour. In contrast, the alternative fitting method (B) ensures a realistic strain response of the model and is proved to be superior since it does not require any significant demands of computational effort or additional testing. The results presented in this paper show that even the artificial transverse strain data (i.e., not measured during testing but generated ex post, based on assumed Poisson’s ratio) are much less hazardous than total disregard of the transverse strain response.
Keywords in English
Arterial wall mechanics; Constitutive models; Transverse deformation; Poisson's ratio; Model calibration; Hyperfit software
Released
01.02.2024
Publisher
ELSEVIER
Location
AMSTERDAM
ISSN
1751-6161
Volume
150
Number
150
Pages from–to
106194-1–106194-14
Pages count
14
BIBTEX
@article{BUT186880,
author="Pavel {Skácel} and Jiří {Burša},
title="Need for transverse strain data for fitting constitutive models of arterial tissue to uniaxial tests",
year="2024",
volume="150",
number="150",
month="February",
pages="106194-1--106194-14",
publisher="ELSEVIER",
address="AMSTERDAM",
issn="1751-6161"
}