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Modelling of rolling contact fatigue damage of rail
Fajdiga, Gorazd ...
Abstract Various kinds of defects are induced by rolling contact on the rail track. Rail dark spot defect, also termed as squat failure or shelling, is a rolling contact fatigue failure which occurs ...frequently on the high speed traffic railway rails. Therefore, it is one of the most dangerous rail failures. Rail dark spot defect is strongly dependent on loading conditions, material of contacting parts, surface roughness, etc. Theories of contact and fracture mechanics are widely used to understand this complex phenomenon. The main goal of this study is to develop a computational model for simulation of the complete material fatigue process in rail-wheel contact, starting from the micro-structural changes in the material, subsequent crack initiation and its propagation. The proposed computational model consists of two parts: (i) Contact Fatigue Crack Initiation (CFCI) model and (ii) Contact Fatigue Crack Propagation (CFCP) model. The results of proposed unified model enable a computational prediction of a probable number of loading cycles that a wheel-rail system can sustain before development of the initial crack in the rail, as well as the number of loading cycles required for a crack to propagate from initial to critical length, when the final fatigue failure (squat) can be expected to occur.
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