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"
}