Detail publikace
Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms
MAN, V. POLZER, S. GASSER, T. NOVOTNÝ, T. BURŠA, J.
Anglický název
Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms
Typ
článek v časopise ve Web of Science, Jimp
Jazyk
en
Originální abstrakt
Biomechanics-based assessment of Abdominal Aortic Aneurysm (AAA) rupture risk has gained considerable scientific and clinical momentum. However, computation of peak wall stress (PWS) using state-of-the-art finite element models is time demanding. This study investigates which features of the constitutive description of AAA wall are decisive for achieving acceptable stress predictions in it. Influence of five different isotropic constitutive descriptions of AAA wall is tested; models reflect realistic non-linear, artificially stiff non-linear, or artificially stiff pseudo-linear constitutive descriptions of AAA wall. Influence of the AAA wall model is tested on idealized (n=4) and patient-specific (n=16) AAA geometries. Wall stress computations consider a (hypothetical) load-free configuration and include residual stresses homogenizing the stresses across the wall. Wall stress differences amongst the different descriptions were statistically analyzed. When the qualitatively similar non-linear response of the AAA wall with low initial stiffness and subsequent strain stiffening was taken into consideration, wall stress (and PWS) predictions did not change significantly. Keeping this non-linear feature when using an artificially stiff wall can save up to 30% of the computational time, without significant change in PWS. In contrast, a stiff pseudo-linear elastic model may underestimate the PWS and is not reliable for AAA wall stress computations.
Anglický abstrakt
Biomechanics-based assessment of Abdominal Aortic Aneurysm (AAA) rupture risk has gained considerable scientific and clinical momentum. However, computation of peak wall stress (PWS) using state-of-the-art finite element models is time demanding. This study investigates which features of the constitutive description of AAA wall are decisive for achieving acceptable stress predictions in it. Influence of five different isotropic constitutive descriptions of AAA wall is tested; models reflect realistic non-linear, artificially stiff non-linear, or artificially stiff pseudo-linear constitutive descriptions of AAA wall. Influence of the AAA wall model is tested on idealized (n=4) and patient-specific (n=16) AAA geometries. Wall stress computations consider a (hypothetical) load-free configuration and include residual stresses homogenizing the stresses across the wall. Wall stress differences amongst the different descriptions were statistically analyzed. When the qualitatively similar non-linear response of the AAA wall with low initial stiffness and subsequent strain stiffening was taken into consideration, wall stress (and PWS) predictions did not change significantly. Keeping this non-linear feature when using an artificially stiff wall can save up to 30% of the computational time, without significant change in PWS. In contrast, a stiff pseudo-linear elastic model may underestimate the PWS and is not reliable for AAA wall stress computations.
Klíčová slova anglicky
Abdominal aortic aneurysm, Wall stress, Non-linear material model
Vydáno
01.03.2018
Nakladatel
Elsevier
Místo
Amsterdam, Nizozemsko
ISSN
1350-4533
Ročník
53
Číslo
1
Strany od–do
49–57
Počet stran
9
BIBTEX
@article{BUT152171,
author="Vojtěch {Man} and Jiří {Vaverka} and Stanislav {Polzer} and Thomas Christian {Gasser} and Jiří {Burša},
title="Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms",
year="2018",
volume="53",
number="1",
month="March",
pages="49--57",
publisher="Elsevier",
address="Amsterdam, Nizozemsko",
issn="1350-4533"
}