1 School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China 2 Artificial Intelligence Department of Jiangxi University of Technology, Nanchang 330096, China
Abstract: The wheel cracks of subway vehicles often initiate on the wheel tread and subsurface, and the subsurface crack is one of the key factors affecting the wheel life. In this work, the finite element simulation method was used to insert different initial cracks into the sub-surface of the three-dimensional wheel-rail contact model. The effects of different wheel-rail matching forms and different initial crack parameters on the sub-surface fatigue crack propagation characteristic is studied. The results show that the contact stress at 3 mm of the wheel sub-surface is the largest. Among the three types of tapered, LM and LMA treads, the equivalent stress of the wheel sub-surface is the largest when the LM tread is used, and the fatigue failure is most likely to occur. The crack propagation shows multiaxial fatigue crack propagation characteristics, and the crack propagation rate under the tapered tread condition is higher than that under the other two tread types. Among different initial crack angles, 45° initial crack angle is the most dangerous angle; the initial crack depth has no effect on the crack propagation path. The research results of this work have certain engineering and theoretical guiding significance for the evaluation of buried crack defects and residual life prediction of wheel sub-surface.
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2024, Vol. 38 
