Fluid-structure interaction in abdominal aortic aneurysms: Structural and geometrical considerations

Yaser Mesri, Hamid Niazmand (), Amin Deyranlou and Mahmood Reza Sadeghi
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Yaser Mesri: Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran;
Hamid Niazmand: Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran;
Amin Deyranlou: Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad, Iran;
Mahmood Reza Sadeghi: Department of Biomedical Engineering, University of Isfahan, Isfahan, Iran

International Journal of Modern Physics C (IJMPC), 2015, vol. 26, issue 04, 1-18

Abstract: Rupture of the abdominal aortic aneurysm (AAA) is the result of the relatively complex interaction of blood hemodynamics and material behavior of arterial walls. In the present study, the cumulative effects of physiological parameters such as the directional growth, arterial wall properties (isotropy and anisotropy), iliac bifurcation and arterial wall thickness on prediction of wall stress in fully coupled fluid-structure interaction (FSI) analysis of five idealized AAA models have been investigated. In particular, the numerical model considers the heterogeneity of arterial wall and the iliac bifurcation, which allows the study of the geometric asymmetry due to the growth of the aneurysm into different directions. Results demonstrate that the blood pulsatile nature is responsible for emerging a time-dependent recirculation zone inside the aneurysm, which directly affects the stress distribution in aneurismal wall. Therefore, aneurysm deviation from the arterial axis, especially, in the lateral direction increases the wall stress in a relatively nonlinear fashion. Among the models analyzed in this investigation, the anisotropic material model that considers the wall thickness variations, greatly affects the wall stress values, while the stress distributions are less affected as compared to the uniform wall thickness models. In this regard, it is confirmed that wall stress predictions are more influenced by the appropriate structural model than the geometrical considerations such as the level of asymmetry and its curvature, growth direction and its extent.

Keywords: Abdominal aortic aneurysm; peak wall stress; fluid-structure interaction; asymmetry; material model; wall thickness (search for similar items in EconPapers)
Date: 2015
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DOI: 10.1142/S0129183115500382

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