钢制薄壁车轮弯曲疲劳模拟精度探讨

介绍了如何用有限元法准确模拟钢制薄壁车轮弯曲疲劳试验的方法,着重讲述如何合理选择有限元网格类型、单元积分形式、单元尺寸大小,强调分析应采用材料“真应力-应变”曲线,给出旋转作用力、螺栓预紧力、加载时间步的设置方法和注意事项,以及判断有限元应力分析结果是否合理的方法。论文随后以车轮疲劳试验结果为参照,结合S-N曲线数学表达式,给出一种分析车轮疲劳寿命的简易方法,并基于这个简易方法去预测另一款大小相近、材料牌号相同的车轮寿命,发现寿命预测结果与试验结果较为接近,认为论文所介绍的应力和疲劳分析方法有较好的实用性。

Discussion on Simulation Accuracy of Bending Fatigue for Thin Steel Wheels

This paper introduces how to accurately simulate the bending fatigue test of steel thin-walled wheels by finite element method.It focuses on how to reasonably select the type of finite element,the form of element integration and the size of element.It emphasizes that the material“true stress-strain”curve should be adopted in the analysis.It gives the setting methods and precautions of the rotational force,bolt pre-tightening force and loading step,and the method to judge whether the finite element stress analysis results are reasonable or not.The paper then gives a simple method to analyze the fatigue life of wheels based on the results of wheel fatigue test and the mathematical expression of S-N curve,and predicts the life of another wheel with the same size and material grade based on this simple method.It is found that the life prediction results are relatively similar to the test results.The result indicates that the stress and fatigue analysis method introduced in the paper has a better practicability.