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针对车轮动态弯曲疲劳试验建立了两种轿车车轮的静态线性有限元模型 ,它们可以有效地用来确定车轮结构的危险点 ,即结构中计算应力 (vonMises应力 )比较大的点。结构危险点的计算应力反映该处的应力集中程度。对车轮结构上计算应力较大的测点进行实验应力分析 ,验证有限元分析结果。对结构危险点的应力状态进行分析 ,有助于预测车轮疲劳裂纹的发生方向和引起疲劳损伤的主要应力循环 ,在所研究的车轮结构中也就是沿着车轮径向的正应力变程。分析还表明 ,在动态弯曲疲劳试验中 ,车轮结构各点所承受的可能是非对称应力循环
For dynamic wheel bending fatigue test, static linear finite element models of two kinds of car wheels are established, which can be effectively used to determine the dangerous point of the wheel structure, ie, the point where the calculated von Mises stress is relatively large. The calculated stress at the point of structural danger reflects the degree of stress concentration there. The experimental stress analysis is carried out on the measuring points with large stress on the wheel structure to verify the finite element analysis results. Analysis of the stress state at the dangerous point of the structure is helpful for predicting the occurrence direction of the wheel fatigue crack and the main stress circulation causing the fatigue damage. In the wheel structure under study, it is also the normal stress variation along the wheel radial direction. Analysis also shows that in the dynamic bending fatigue test, the wheel structure may be subjected to various points of asymmetric stress cycling