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FEM Simulations of Fatigue Crack Initiation in the Oligocrystalline Microstructure of Stents by Galina Lasko; S. Schmauder; Yitong Yang; Sabine Weiss; Kiarash Dogahe is a Engineering article available to read on EtoBox.

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For over two decades, vascular stents have been widely used to treat clogged vessels, serving as a scaffold to enlarge the narrowed lumen and recover the arterial flow area. High-purity oligocrystalline austenitic steel is usually applied for the production of stents. Despite the popularity and benefit of stenting, it still may cause serious clinical adverse issues, such as in-stent restenosis and stent fracture. Therefore, the study of the mechanical properties of stents and in particular the prediction of their life cycles are in the focus of materials research. In our contribution, within the finite element method, a two-scale model of crack initiation in the microstructure of stents is elaborated. The approach is developed on the basis of the physically based Tanaka–Mura model (TMM), considering the evolution of shear bands during the crack initiation phase. The model allows for the analysis of the microstructure with respect to the life cycles of real materials. The effects of different loading conditions, grain orientation, and thickness of the specimen on Wöhler curves were analysed. It was found that the microstructural features of oligocrystals are very sensitive to differ

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Author

Galina Lasko; S. Schmauder; Yitong Yang; Sabine Weiss; Kiarash Dogahe

Publisher

MDPI AG

Published

2023

Language

EN

Field

Engineering (Physical Sciences)