Meysam Naeimi, Zili Li, Zhiwei Qian, Rolf Dollevoet
Wear and RCF
1st International Conference on Ageing of Materials & Structures
Year: May 2014
Location: Delft, the Netherlands
cracks Initiation, fatigue Life, finite element method, rail Squats, Rolling Contact Fatigue
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A modeling procedure to predict the residual fatigue life of rail at squats seeds is developed in this article. Two models are involved: a 3D explicit Finite Element (FE) model to compute the stress and strain at quats in rail, and the J-S fatigue damage model to determine the residual fatigue life on the basis of the computed stress and strain. In the FE model dynamic effects of wheel-rail system under rolling contact is taken into account. Bilinear isotropic elastic-plastic material properties are adopted to represent the hardening of wheel and rail. Squats are subject to multiple loading cycles. The geometry of the squat is varied in the simulation corresponding to a growing squat at different ages. It is found that small squats lead to fatigue failure while severe ones lead to ratcheting failure.