The Effect of Material Model Formulation in the Stress Analysis of Abdominal Aortic Aneurysms

QC 20110418
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.

TEKNIK OCH TEKNOLOGIER Medicinteknik Medicinsk laboratorie- och mätteknik hsv//swe
ENGINEERING AND TECHNOLOGY Medical Engineering Medical Laboratory and Measurements Technologies hsv//eng
Aneurysm
Wall stress
Anisotropy
Soft tissue mechanics
Computational modeling
Rupture
Biomechanics
Thrombus
Medical engineering
Medicinsk teknik

In:Annals of Biomedical Engineering: Springer Science and Business Media LLC37:11, s. 2218-22210090-69641573-9686

By the author/editor: Rodriguez, Jose ...; Martufi, Giampal ...; Doblare, Manuel; Finol, Ender A.

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Medical Engineer ...; and Medical Laborato ...

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