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Mechanical stresses in abdominal aortic aneurysms: Influence of diameter, asymmetry, and material anisotropy
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Biomechanics.
2008 (English)In: Journal of Biomechanical Engineering, ISSN 0148-0731, Vol. 130, no 2Article in journal (Refereed) Published
Abstract [en]

Biomechanical studies suggest that one determinant of abdominal aortic aneurysm (AAA) rupture is related to the stress in the wall. In this regard, a reliable and accurate stress analysis of an in vivo AAA requires a suitable 3D constitutive model. To date, stress analysis conducted on AAA is mainly driven by isotropic tissue models. However, recent biaxial tensile tests performed on AAA tissue samples demonstrate the anisotropic nature of this tissue. The purpose of this work is to study the influence of geometry and material anisotropy on the magnitude and distribution of the peak wall stress in AAAs. Three-dimensional computer models of symmetric and asymmetric AAAs were generated in which the maximum diameter and length of the aneurysm were individually controlled. A five parameter exponential type structural strain-energy function was used to model the anisotropic behavior of the AAA tissue. The anisotropy is determined by the orientation of the collagen fibers (one parameter of the model). The, results suggest that shorter aneurysms are more critical when asymmetries are present. They show a strong influence of the material anisotropy on the magnitude and distribution of the peak stress. Results confirm that the relative aneurysm length and the degree of aneurysmal asymmetry should be considered in a rupture risk decision criterion for AAAs.

Place, publisher, year, edition, pages
2008. Vol. 130, no 2
Keyword [en]
abdominal aortic aneurysm, constitutive modeling, anisotropy, finite, element analysis, wall stress, biomechanical behavior, arterial-wall, rupture, model, risk, elasticity, resection
URN: urn:nbn:se:kth:diva-17533DOI: 10.1115/1.2898830ISI: 000255902000023ScopusID: 2-s2.0-47149111397OAI: diva2:335577
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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Holzapfel, Gerhard A.
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