Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00159816%3A_____%2F18%3A00068708" target="_blank" >RIV/00159816:_____/18:00068708 - isvavai.cz</a>

Alternative codes found

RIV/00216224:14110/18:00102966 RIV/00216305:26210/18:PU130356

Result on the web

<a href="http://dx.doi.org/10.1016/j.medengphy.2018.01.002" target="_blank" >http://dx.doi.org/10.1016/j.medengphy.2018.01.002</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.medengphy.2018.01.002" target="_blank" >10.1016/j.medengphy.2018.01.002</a>

Result language

angličtina

Original language name

Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms

Original language description

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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20601 - Medical engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Medical Engineering &amp; Physics

ISSN

1350-4533

e-ISSN

—

Volume of the periodical

53

Issue of the periodical within the volume

MAR 2018

Country of publishing house

GB - UNITED KINGDOM

Number of pages

9

Pages from-to

49-57

UT code for WoS article

000429510600005

EID of the result in the Scopus database

2-s2.0-85041587268