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@article{1420083,
author = {Man, V. and Polzer, S. and Gasser, T.C. and Novotný, Tomáš and Bursa, J.},
article_location = {OXFORD},
article_number = {MAR 2018},
doi = {http://dx.doi.org/10.1016/j.medengphy.2018.01.002},
keywords = {Abdominal aortic aneurysm; Wall stress; Non-linear material model},
language = {eng},
issn = {1350-4533},
journal = {MEDICAL ENGINEERING & PHYSICS},
title = {Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms},
volume = {53},
year = {2018}
}
TY - JOUR
ID - 1420083
AU - Man, V. - Polzer, S. - Gasser, T.C. - Novotný, Tomáš - Bursa, J.
PY - 2018
TI - Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms
JF - MEDICAL ENGINEERING & PHYSICS
VL - 53
IS - MAR 2018
SP - 49-57
EP - 49-57
PB - ELSEVIER SCI LTD
SN - 13504533
KW - Abdominal aortic aneurysm
KW - Wall stress
KW - Non-linear material model
N2 - 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-ofthe-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. (C) 2018 IPEM. Published by Elsevier Ltd. All rights reserved.
ER -
MAN, V., S. POLZER, T.C. GASSER, Tomáš NOVOTNÝ a J. BURSA. Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms. \textit{MEDICAL ENGINEERING \&{}amp; PHYSICS}. OXFORD: ELSEVIER SCI LTD, roč.~53, MAR 2018, s.~49-57. ISSN~1350-4533. doi:10.1016/j.medengphy.2018.01.002. 2018.
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