Publication detail

Definition of principal material directions at irregular arterial shapes

BARTOŇOVÁ, P. POLZER, S. BURŠA, J.

Original Title

Definition of principal material directions at irregular arterial shapes

English Title

Definition of principal material directions at irregular arterial shapes

Type

conference paper

Language

en

Original Abstract

For computational modelling of arterial tissues anisotropic constitutive models are preferred for which knowledge on orientation of fibres (principal material directions) is needed. In this paper the impact of different approaches to definition of principal material directions in an anisotropic model of arterial wall is evaluated. Finite element models of different regular shapes were created, as well as two idealized geometries of aortic aneurysms as examples of irregular shapes. In those geometries, difference in maximum principal stresses in the arterial wall was used for evaluation of impact of uncertainty in the principal directions. It was shown that for a cylindric shape the error is negligible but it increases for more irregular geometries. For an asymmetric aortic aneurysm the impact of different orientations of principal material directions was more than 20 % which shows that the uncertainty in orientation of principal material directions may cause significant errors deteriorating completely the advantage of anisotropic material description.

English abstract

For computational modelling of arterial tissues anisotropic constitutive models are preferred for which knowledge on orientation of fibres (principal material directions) is needed. In this paper the impact of different approaches to definition of principal material directions in an anisotropic model of arterial wall is evaluated. Finite element models of different regular shapes were created, as well as two idealized geometries of aortic aneurysms as examples of irregular shapes. In those geometries, difference in maximum principal stresses in the arterial wall was used for evaluation of impact of uncertainty in the principal directions. It was shown that for a cylindric shape the error is negligible but it increases for more irregular geometries. For an asymmetric aortic aneurysm the impact of different orientations of principal material directions was more than 20 % which shows that the uncertainty in orientation of principal material directions may cause significant errors deteriorating completely the advantage of anisotropic material description.

Keywords

arterial mechanics, constitutive model, anisotropy, principal directions

Released

14.05.2018

ISBN

978-80-86246-88-8

Book

Engineering Mechanics 2018

Pages from

57

Pages to

60

Pages count

4

URL

Documents

BibTex


@inproceedings{BUT151689,
  author="Petra {Bartoňová} and Stanislav {Polzer} and Jiří {Burša}",
  title="Definition of principal material directions at irregular arterial shapes",
  annote="For computational modelling of arterial tissues anisotropic constitutive models are preferred for which knowledge on orientation of fibres (principal material directions) is needed. In this paper the impact of different approaches to definition of principal material directions in an anisotropic model of arterial wall is evaluated. Finite element models of different regular shapes were created, as well as two idealized geometries of aortic aneurysms as examples of irregular shapes. In those geometries, difference in maximum principal stresses in the arterial wall was used for evaluation of impact of uncertainty in the principal directions. It was shown that for a cylindric shape the error is negligible but it increases for more irregular geometries. For an asymmetric aortic aneurysm the impact of different orientations of principal material directions was more than 20 % which shows that the uncertainty in orientation of principal material directions may cause significant errors deteriorating completely the advantage of anisotropic material description.",
  booktitle="Engineering Mechanics 2018",
  chapter="151689",
  doi="10.21495/91-8-57",
  howpublished="print",
  year="2018",
  month="may",
  pages="57--60",
  type="conference paper"
}