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The Effect of Material Model Formulation in the Stress Analysis of Abdominal Aortic Aneurysms
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Biomechanics.
2009 (English)In: Annals of Biomedical Engineering, ISSN 0090-6964, E-ISSN 1573-9686, Vol. 37, no 11, 2218-2221 p.Article in journal (Refereed) Published
Abstract [en]

A reliable estimation of wall stress in Abdominal Aortic Aneurysms (AAAs), requires performing an accurate three-dimensional reconstruction of the medical image-based native geometry and modeling an appropriate constitutive law for the aneurysmal tissue material characterization. A recent study on the biaxial mechanical behavior of human AAA tissue specimens demonstrates that aneurysmal tissue behaves mechanically anisotropic. Results shown in this communication show that the peak wall stress is highly sensitive to the anisotropic model used for the stress analysis. In addition, the present investigation indicates that structural parameters (e.g., collagen fiber orientation) should be determined independently and not by means of non-linear fitting to stress-strain test data. Fiber orientation identified in this manner could lead to overestimated peak wall stresses.

Place, publisher, year, edition, pages
2009. Vol. 37, no 11, 2218-2221 p.
Keyword [en]
Aneurysm, Wall stress, Anisotropy, Soft tissue mechanics, Computational modeling, Rupture, Biomechanics, Thrombus
National Category
Medical Laboratory and Measurements Technologies
URN: urn:nbn:se:kth:diva-32563DOI: 10.1007/s10439-009-9767-1ISI: 000270448300005ScopusID: 2-s2.0-70349656337OAI: diva2:411289
QC 20110418Available from: 2011-04-18 Created: 2011-04-15 Last updated: 2011-04-18Bibliographically approved

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