Effect of using more realistic thrombosis with three layers of different material properties on axisymmetric finite element model on Abdominal Aortic Aneurysm

Abdominal aortic aneurysm (AAA) is a cardiovascular disease occurring when the aorta becomes weak and develops a balloon expansion in its wall that leads to rupture and cause death. Intraluminal thrombus (ILT) which exists in more than 75% of AAA is usually modeled as homogenous material; however, in reality ILT consists of three layers with different material properties. The role of more realistic thrombosis with three layers of different material properties is examined here using two finite element models to understand its effect on wall stresses and it was found that using homogeneous material properties for ILT when modelling AAA could lead to overestimation of the wall stresses and may affect the accuracy of the results.