Computational biomechanics of abdominal aortic aneurysms (AAAs) made it possible to investigate several aspects of the disease and to provide information that would otherwise be difficult to obtain from experiments; the determination of wall stress distributions and rupture risk are two examples. A very few anisotropic strain–energy functions aim to capture vascular biomechanics and involve some coding to specify the collagen fibre orientations. In this study, we developed a solid mechanics framework for the use within Abaqus v. 6.10 (SIMULIA, Providence, RI, USA) with the aim to model the anisotropic response of AAAs in a robust and straightforward way. The proposed framework contains: (i) geometry reconstruction allowing flexible meshing; (ii) generation of 3D centrelines for each arterial branch; (iii) robust assignment of 3D collagen fibre orientation; (iv) AAA parameters for the Holzapfel–Gasser–Ogden model implemented in Abaqus. In the result section, we reproduce published stresses of an idealized geometry under physiological pressure with a difference of 4.41%, and apply the framework to patient-specific geometries. Finally, the simulation of an AAA deformed by two catheters during endovascular aortic repair is demonstrated.
Fields of Expertise
- Human- & Biotechnology
Treatment code (Nähere Zuordnung)
- Basic - Fundamental (Grundlagenforschung)