在对30CrMnSiA钢多轴疲劳寿命研究的基础上,基于单轴拉压和纯扭S-N曲线,提出了等效S-N曲线的概念。基于等效S-N曲线,建立了预测硬质金属材料多轴疲劳寿命的经验公式。采用该公式对文献中的多种硬质金属材料进行了寿命预测,预测结果显示94.0%以上的数据点均处于±3倍疲劳寿命分散带之内,81.8%以上的数据点处于±2倍疲劳寿命分散带之内。

According to the study of multiaxial fatigue life of 30CrMnSiA steel, the concept of equivalent S-N curve is proposed based on the uniaxial tension-compression and pure torsion S-N curves in this paper. Based on the equivalent S-N curves, an empirical formula is established to predict the multiaxial fatigue life of hard metal materials. The empirical formula is verified by predicting the fatigue life of various hard metal materials in the literature. Results show that more than 94.0% of the data points are in the ±3 times fatigue life scatter band, and more than 81.8% of the data points are in the ±2 times fatigue life scatter band.

国家自然科学基金资助项目(11172021)。