Inverse material parameter estimation of patient‐specific finite element models at the carotid bifurcation: The impact of excluding the zero‐pressure configuration and residual stress

Abstract

The carotid bifurcation experiences a complex loading environment due to its anatomical structure. Previous in-vivo material parameter estimation methods often use simplified model geometries, isotropic hyperelastic constitutive equations or neglect key aspects of the vessel, such as the zero-pressure configuration or residual stress, all of which have independently been shown to alter the stress environment of the vessel wall. Characterizing the location of high stress in the vessel wall has often been proposed as a potential indicator of structural weakness. However, excluding the afore-mentioned zero-pressure configura-

Computational Study of Abdominal Aortic Aneurysm Walls Accounting for Patient-Specific Non-Uniform Intraluminal Thrombus Thickness and Distinct Material Models: A Pre- and Post-Rupture Case

“…According to various published works that employed the so-called "zero pressure geometry", the conventional procedure causes either an overestimation [59] or an underestimation of the predicted wall stresses [60]. As is shown in a recent numerical work [61], in addition to a zero-pressure geometry, it is important to exclude the residual stresses as well. However, the focus of the present work is mainly on the presentation of the details in the implementation of the HGO model and the treatment of the ILT-aortic wall interface.…”