不同强度理论在曲轴疲劳研究中的对比应用

摘要/Abstract

摘要： 采用有限元法对曲轴在弯矩载荷作用下的应力状态进行分析，并结合插值法对曲轴的应力分布进行拟合计算，在此基础上采用临界距离法与不同强度理论对相同材料、不同圆角半径的曲轴的结构疲劳特性进行预测研究，并对预测结果进行试验验证。研究结果表明：当基于第一强度理论与临界距离法对圆角半径不同的曲轴的疲劳特性进行预测时，无论是临界点法还是临界线法都会造成较大误差；而当基于第三及第四强度理论与临界距离法进行预测时，临界线法比临界点法的预测精度更高，分析认为这是由曲轴的破坏类型造成的。

关键词: 曲轴, 疲劳特性, 临界距离, 强度理论

Abstract: The stress states of a crankshaft under bending moment loading were analyzed by using finite element method, and the stress distributions of a crankshaft were calculated by interpolation method. Then，the critical distance method and different strength criterions were chosen to predict the structural fatigue properties of crankshafts with the same material and different fillet radius. Corresponding experimental verifications were also conducted. The results show that the fatigue characteristics of the crankshafts with different fillet radius are predicted based on the first strength criterion and the critical distance method, both of the critical point method and line method will cause some relatively apparent errors. While the predictions are based on the third, fourth strength criterion and critical distance method, the critical line method has higher accuracy than that of the critical point method, which is caused by the damage types of the crankshafts.

Key words: crankshaft, fatigue property, critical distance, strength criterion

中图分类号:

TH164

孙嵩松;万茂松;徐晓美;张营. 不同强度理论在曲轴疲劳研究中的对比应用[J]. 中国机械工程.

SUN Songsong;WAN Maosong;XU Xiaomei;ZHANG Ying. Comparable Application of Different Strength Criterions in Crankshaft Fatigue Researches[J]. China Mechanical Engineering.

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