Gagliardi, Mme Alexia (2021) Biomechanical analysis of ascending thoracic aortic aneurysms PRE - Research Project, ENSTA.

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Abstract

The mechanisms triggering aortic aneurysms are still incompletely known, but they lead to a weakening of the aortic wall and its enlargement. As aneurysms are mostly asymptomatic until complications happen, surgery is recommended when the aortic diameter reaches 55mm. However, this criterion can be questioned because it does not take into account individual patient variables such as age or gender, as well as the mechanical phenomena occurring within the aortic tissue. As a result, many research groups have been using biomechanical simulations to evaluate those connections and to assess aneurysm's complication risk. The purpose of this paper is to provide a biomechanical analysis of ascending thoracic aortic aneurysms (ATAA) and assess their retrospective complication risk. First of all, in vivo maps based on preoperative 4D CT scans were constructed. Then, patient-specic parameters of the Gasser-Ogden-Holzapfel (GOH) constitutive model were obtained using a Matlab code which processed the results of planar biaxial tensile tests. Finally, patient-specific finite element simulations were performed in Abaqus® to assess the aneurysm's retrospective complication risk.

Item Type:Thesis (PRE - Research Project)
Uncontrolled Keywords:Finite element modeling, GOH, Constrained mixture theory, Ascending thoracic aortic aneurysm, Biomechanics
Subjects:Materials Science, Mechanics and Mechanical Engineering
Life Sciences and Engineering
ID Code:8451
Deposited By:alexia Gagliardi
Deposited On:18 août 2021 16:13
Dernière modification:18 août 2021 16:13

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