Abstract: To address the issue of significant errors in predicting the multiaxial fatigue life of notched components with local stress-strain method, a method for predicting the fatigue life of notched components under multiaxial loading was proposed based on the critical plane theory which toke the stress gradient and size of the notchs and influences of additional strengthening effects into account. The model was validated by experimental data from three different materials of notched specimens, and the prediction results of the proposed model were compared with those of two classic models. The results show that the prediction accuracy of the proposed model is higher than that of the other two models, and the prediction results are almost all within the double life error band.

Key words: multiaxial fatigue, notched specimen, notch effect, additional damage

摘要： 针对利用局部应力应变法预测缺口件多轴疲劳寿命结果误差较大的问题，基于临界平面理论，综合考虑缺口的应力梯度和尺寸以及附加强化效应对疲劳寿命的影响，提出一种多轴加载下缺口件疲劳寿命的预估方法。采用3种不同材料的缺口件实验数据进行模型验证，并将提出模型与2种经典模型的预测结果进行对比，结果表明：提出模型的预测精度高于另外两种，预测结果几乎都在二倍寿命误差带内。

关键词: 多轴疲劳, 缺口件, 缺口效应, 附加损伤