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Contribution à la prédiction de la rupture des Anévrismes de l'Aorte Abdominale (AAA)

Abstract : The aim of this work is to contribute to a better prediction of the Abdominal Aortic Aneurysm rupture (AAA). For that purpose, finite elements simulations have been performed on idealized AAA models under physiopathological like conditions, by taking into account the aneurysmal wall anisotropy, the intra-luminal thrombus porosity and the Fluid-Structure Interactions. In the first part, the influence of the aneurysm geometry and its wall properties (isotropic or anisotropic hyperelasticity) on the wall stress distribution and the Peterson's modulus has been studied in a static analysis and without taking into account the thrombus. In the second part, based on the experimental results from the litterature, a porohyperelastic model has been proposed for the thrombus. By considering such behavior for the thrombus and the Fluid-Structure Interactions, we observe that the intra-thrombus pressure is the same order as the intra-luminal pressure, which is consistent with in vivo measurements. Our results show that despite this unchanged pressure, the maximum wall stress decreases leading to a decrease of the aneurysm potential rupture.
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  • HAL Id : tel-00623979, version 3

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Mamadou Toungara. Contribution à la prédiction de la rupture des Anévrismes de l'Aorte Abdominale (AAA). Autre. Université de Grenoble, 2011. Français. ⟨NNT : 2011GRENI036⟩. ⟨tel-00623979v3⟩

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