Abstract
A three-dimensional finite element model of wheel-rail that contains an initial crack in rail subsurface was established, the influences of initial crack angle, depth and size on mixed fatigue crack growth behaviour under actual load were evaluated. The results showed that the initial crack propagated with II + III mixed mode, and the slip propagation of mode II was dominant. Different initial crack angle, depth and size lead to variable proportions of mode II and mode III because of the load mixity at the crack tip, which further affects the equivalent stress intensity factor (SIF) range ΔKeq and residual fatigue lifetime. 45° was the most dangerous angle of initial crack, which leads to the highest ΔKeq and the fastest crack growth initial crack depth increased, the ΔKeq and crack growth rate decreased sharply. With the increase of initial crack size, the ΔKeq increased and crack propagation was accelerated.
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