非对称循环载荷下材料低周疲劳寿命分析与计算

提出了一个用于计算非对称循环载荷下材料低周疲劳寿命的累积损伤模型和方法，该方法利用全应变幅及损伤积累来控制和计算疲劳寿命，并给出了裂纹的开裂尺寸和开裂方向，这为我们进行各种疲劳寿命计算以及结构优化设计提供了一个新的思路和方法。

Analysis and Computation of Low-Cyclic Fatigue Life under the Action of Asymmetrical Load

In this paper, a method of computation for the low-cyclic fatigue life under the action of asymmetrical cyclic load is proposed. In the analysis, the total strain amplitude as well as the rules of accumulative damage are used for the research of the fatigue life. From the computed results, the direction of the initial crack extension and length of the crack propagation are given. This computational method will be helpful for the calculation of low-cyclic fatigue life under other conditions, and is beneficial for the research of the optimization of structural design.