多轴疲劳寿命预测方法

在工程实际中，大多数工程结构和机械零件都承受着各种形式的循环载荷，载荷分布大多呈现多轴应力状态。在循环荷载作用下，对多轴疲劳寿命的研究比单轴的更加接近工程实际，有更广泛的应用背景。针对这一现状，本文详述了近年来国内外关于多轴疲劳寿命预测方法的研究现状，分别介绍了等效应变法、能量法、临界面法三种主流方法的基本原理及优缺点，并将这三种方法做了简单对比。另外，针对现阶段各类多轴疲劳寿命预测方法的不足，提出了今后在多轴疲劳领域研究工作的设想。

Summarization of multi-axial fatigue life prediction methods

In engineering practice, most engineering structures and mechanical parts are subjected to various forms of cyclic loads, and most of the load distributions exhibit multiple axial stress states. Under cyclic load, the study of multi-axis fatigue life is more close to engineering practice than that of uniaxial fatigue and has a wider application background. As for this situation, the research state of multi-axis fatigue life prediction methods in recent years was described in detail. The fundamentals, advantages and disadvantages of three major methods were introduced and compared:equivalent strain method, energy method and critical plane method. In addition, in view of the shortcomings of various multi-axial fatigue life methods at present, the future research work in multi-axial fatigue field was put forward.