基于能量法的多轴疲劳寿命预测方法

摘 要：有效的疲劳寿命预测方法是确保处于多轴循环载荷作用下的工程构件安全性的关键。结合临界平面思想，提出了一种基于能量法的多轴疲劳寿命预测模型；该模型针对不同的疲劳失效形式采用不同的临界面上能量参数作为损伤参量，可体现多轴加载条件下的平均应力效应以及临界面上各方向参量对材料疲劳损伤的影响。通过六种材料的多轴疲劳试验数据对所提出的模型及其它三种经典能量模型进行了评估与验证，结果显示所提出的模型相较于其他模型具有更好的寿命预测精度及工程适用性。

《Fatigue life prediction under multiaxial loading using energy-based models》

Abstract: For engineering components under multiaxial loadings, fatigue life prediction is significant for guaranteeing their structural safety. A new energy-based model for fatigue life prediction is proposed based on the critical plane approach. The proposed model takes the different energy parameters acting on critical plane as the damage parameters to distinguish different failure modes. These damage parameters can reflect not only the mean stress effect but also the influences of normal and shear components on fatigue damage. The proposed model and three other classical energy-based models were used to evaluate the fatigue life of six kinds of materials under multiaxial loading. Results show that the proposed model has better prediction accuracy and engineering applicability.