转向节疲劳寿命评价及其局部裂纹尺寸的概率分布

转向节的作用是传递和承受汽车的前部载荷，支承和驱动前轮绕主销转动，使汽车转向.针对仍处于开发阶段的某麦弗逊式转向节的疲劳失效问题，提出了一种对其台架试验结果进行评估的方法，根据转向节在系统中的实际连接情况分多工况进行了疲劳台架试验，利用Weibull分布理论结合N_○50%， N_○90%标准对转向节的失效循环次数分布进行了评价，同时推导了一种局部疲劳裂纹尺寸的概率分布预测模型，并利用实测试验数据验证了所推导预测模型的适用性.

Fatigue Life Assessment of a Vehicle Steering Knuckle and Probability Distribution of Its Local Crack Size

The steering knuckle is used to transfer and bear the front load of the vehicle， support and drive the front wheel to rotate around the kingpin to make the automotive turn. Aimed at the fatigue failure of a McPherson-type steering knuckle which is still at the development stage， a method is proposed to evaluate the rig test results based on its actual connection situation in the system， and the fatigue rig test is carried out under multiple working conditions. The failure cycle number distribution of the steering knuckle is evaluated by using Weibull distribution theory and N_50% and N_90% criteria. At the same time， a probability distribution prediction model of local fatigue crack size is derived， and the applicability of the proposed prediction model is verified by the experimental data.