Towards a grain-scale modeling of crack initiation in rolling contact fatigue - Part 2: Persistent slip band modeling
Résumé
Rolling Contact Fatigue (RCF) is the result of crack initiation and propagation leading to surface damages. This study proposes a mesoscopic model for RCF crack initiation simulation. Finite Element Method (FEM) is used to obtain stresses using cubic elasticity. Persistent Slip Bands (PSBs) are modeled using polycrystalline geometry and grain orientations. PSBs can pass through Grain Boundaries (GBs) if the misorientation of the adjacent grains is lower than a critical angle. The Tanaka-Mura micromechanical model is then used to calculate the number of loading cycles required to initiate cracks. The results are compared to previous models and experiments. Initiation depths appear to be consistent.
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