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Impact of isotropic constitutive descriptions on the predicted peak wall stress in abdominal aortic aneurysms
Brno Univ Technol, Inst Solid Mech Mechatron & Biomech, Brno, Czech Republic..
Brno Univ Technol, Inst Solid Mech Mechatron & Biomech, Brno, Czech Republic..
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
Masaryk Univ, Dept Surg 2, St Annes Univ Hosp, Brno, Czech Republic.;Masaryk Univ, Fac Med, Brno, Czech Republic..
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2018 (English)In: Medical Engineering and Physics, ISSN 1350-4533, E-ISSN 1873-4030, Vol. 53, p. 49-57Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 53, p. 49-57
Keywords [en]
Abdominal aortic aneurysm, Wall stress, Non-linear material model
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-226807DOI: 10.1016/j.medengphy.2018.01.002ISI: 000429510600005PubMedID: 29402733Scopus ID: 2-s2.0-85041587268OAI: oai:DiVA.org:kth-226807DiVA, id: diva2:1203674
Note

QC 20180504

Available from: 2018-05-04 Created: 2018-05-04 Last updated: 2018-05-29Bibliographically approved

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