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Mechanical stresses in abdominal aortic aneurysm. Material anisotropy a parametric study
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2007 (English)In: Computational Plasticity - Fundamentals and Applications, COMPLAS IX, 2007, no PART 1, 248-252 p.Conference paper (Refereed)
Abstract [en]

Biomechanical studies suggest that one determinant of abdominal aortic aneurysm (AAA) rupture is related to the stress in the wall. 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. 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.

Place, publisher, year, edition, pages
2007. no PART 1, 248-252 p.
Keyword [en]
Abdominal aortic aneurysm, Anisotropy, Constitutive modeling, Finite element analysis
National Category
Other Medical Sciences
URN: urn:nbn:se:kth:diva-154679ScopusID: 2-s2.0-84857091028ISBN: 978-849673628-3OAI: diva2:758511
9th International Conference on Computational Plasticity: Fundamentals and Applications, COMPLAS IX, 5 September 2007 through 7 September 2007, Barcelona, Spain

QC 20141027

Available from: 2014-10-27 Created: 2014-10-27 Last updated: 2014-10-27Bibliographically approved

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Holzapfel, Gerhard A.
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