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分析了空心车轴的运用载荷,根据所测载荷谱计算了车轴的受力情况。采用四分之一20节点等参退化奇异单元模拟裂纹前沿的应力奇异性。建立了空心车轴表面裂纹扩展的有限元模型,对裂纹前缘进行离散,实现正交扩展,得到不同步扩展的裂纹前缘。在此基础上,对裂纹前缘不同位置的应力强度因子进行了计算分析。由此得出不同初始形状裂纹前缘扩展中的应力强度因子分布规律,并与解析方法计算的结果进行比较,二者的结果基本吻合。对进一步研究空心轴表面裂纹的扩展情况提供了参考。
The applied load of the hollow axle is analyzed, and the axle force is calculated according to the measured load spectrum. The stress singularity at the crack front is modeled using a quarter-point isodential degenerate singular element with 20 nodes. The finite element model of the crack propagation on the surface of the hollow axle is established. The leading edge of the crack is discretized to achieve the orthogonal expansion and the crack leading edge is obtained asynchronously. On this basis, the stress intensity factors at different positions of the crack front are calculated and analyzed. The distribution law of stress intensity factor in different initial crack propagation is obtained and compared with the analytical results. The results of the two methods agree well with each other. It provides a reference for further research on the crack propagation on hollow shaft.