The paper deals with evaluation of the influence of finite element mesh density on the resulting extreme stresses
in models of abdominal aortic aneurysms. In most patient-specific computationalmodels published recently, a free
mesh of tetrahedrons is used and any information on density of the applied mesh is often missing. In this study a
comparison of differentmesh densities has been realized with four patient-specificmodel geometries, all based on a
numerical reconstruction of the unloaded geometry of the aneurysm, and with two different Yeoh-type constitutive
models. It has been shown that resulting maximumstresses are not mesh independent; due to a better description of
the stress gradient in the critical location, the maximum wall stress increases with increasing number of elements
throughout the wall thickness, especially in models without residual stresses. This effect is more pronouncedwhen
using Vande Geest constitutive model with higher strain stiffening than for Raghavan-Vorp material parameters.
Although the mesh density requirements were not so high when the stress gradient was reduced by taking residual
stresses into consideration, even in this case low numbers of elements throughout the wall thickness may givemesh
dependent results. Although for a rigorous recommendation of the mesh density more analyses are needed, it was
shown that the time consuming procedure of taking residual stresses into consideration cannot be replaced by a
simpler model with rough mesh