Multiaxial fatigue of the components is a very complex behavior. This analyzes the multiaxial fatigue failure mechanism, reviews and compares the advantages and disadvantages of the classic model. The fatigue failure mechanism and fatigue life under multiaxial loading are derived through theoretical analysis and formulas, and finally verified with the results of multiaxial fatigue tests. The model of multiaxial fatigue life for low-cycle fatigue life prediction model not only improves the prediction accuracy of the classic model, but also considers the effects of non-proportional additional hardening phenomena and fatigue failure modes. The model is proved to be effective in low-cycle fatigue life prediction under different loading paths and types for different materials. Compared with the other three classical models, the proposed model has higher life prediction accuracy and good engineering applicability.

部件的多轴疲劳是一种非常复杂的行为。分析了多轴疲劳失效机理，回顾并比较了经典模型的优缺点。通过理论分析和公式推导出多轴加载下的疲劳失效机理和疲劳寿命，并最终用多轴疲劳试验结果进行验证。低周疲劳寿命预测模型的多轴疲劳寿命模型不仅提高了经典模型的预测精度，而且考虑了非比例附加硬化现象和疲劳失效模式的影响。事实证明，该模型对于不同材料的不同加载路径和类型下的低周疲劳寿命预测是有效的。与其他三种经典模型相比，该模型具有更高的寿命预测精度和良好的工程适用性。