Multilayer properties of aorta

Current finite element models of the aorta assume a homogenous material, but in fact aorta is composed of three major layers. Understanding of the material properties of these layers is essential in order to study the local mechanism of dynamic rupture. The material properties of aorta wall layers were determined from microindentation tests. The results showed significant linear increase of the shear modulus in the inner half of media. A dominant viscoelastic behavior was observed which was almost uniform throughout the layers.