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采用有限元分析软件ANSYS,结合疲劳与磨耗耦合模型,分析朔黄铁路神池南站钢轨裂纹疲劳与磨损的行为机制。结果表明:裂纹扩展速率明显大于钢轨表面的磨耗速率,钢轨破坏形式以疲劳破坏为主;随着裂纹的不断扩展,其扩展速率由快变慢,当裂纹扩展到600μm时,其扩展速率达到最大;在裂纹初始扩展阶段,裂纹扩展方向基本与行车方向一致;当裂纹长度大于600μm后,裂纹扩展方向发生了改变(沿着与起始阶段相反的方向扩展),形成鱼钩形裂纹,导致钢轨表面出现剥离掉块。
The finite element analysis software ANSYS was used to analyze fatigue and wear behaviors of rail cracks at Shenchi South Station of Shuohuang Railway combined with fatigue and wear coupling model. The results show that the crack propagation rate is obviously higher than the wear rate of the rail surface, and the failure mode of the rail is mainly fatigue failure. As the crack propagates, its propagation rate changes from fast to slow. When the crack propagates to 600μm, ; At the initial stage of crack initiation, the direction of crack propagation is basically consistent with the driving direction. When the crack length is over 600 μm, the direction of crack propagation changes (along the direction opposite to the initial stage), forming a hook-shaped crack, Peeled off the surface of the block appears.