Modelling of Rolling Contact Fatigue of Rails
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. The main goal of this study is to develop a computational model for simulation of the squat phenomena on rails in rail-wheel contact. The proposed computational model consists of two parts: (i) Contact Fatigue Crack Initiation (CFCI) and (ii) Contact Fatigue Crack Propagation (CFCP). 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.
M.H. Aliabadi, Qingfen Li, Li Li and F.-G. Buchholz
G. Fajdiga, M. Šraml, J. Kramar, "Modelling of Rolling Contact Fatigue of Rails", Key Engineering Materials, Vols. 324-325, pp. 987-990, 2006