白色層を含む鉄道車両用車輪踏面疲労損傷に及ぼすすべりの影響に関するFEM解析

概要

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Spalling is one of the typical rolling contact fatigue failure of railway wheels. In this study, in order to clarify the mechanism and the condition of fatigue crack initiation in wheel tread with white layer, elastic-plastic FEM analyses were conducted. The results are summarized as follows: Dang Van model, which is one of the multiaxial fatigue strength evaluation methods, was applied to evaluate the damage level of white layer. Accordingly, it is clear that fatigue crack has a tendency to originate at the leading edge of white layer particularly under slip condition. Furthermore, it is possible to identify the detailed position of fatigue crack initiation site by using accumulation damage value which was calculated by Dang Van model. According to plastic strain distribution of base metal around the white layer, the area which indicates high plastic strain value at the leading edge of white layer was larger than at the trailing edge. It is concluded that these plastic strain area of base metal at the leading edge of white layer contributes the fatigue damage around the white layer.
日本材料学会の論文