This paper investigates the effect of loading history on cyclic deformation and fatigue behaviour of 7075-T651 aluminium alloy subjected to two-step loading. High-low and low–high sequences, encompassing both symmetrical and asymmetrical steps, are performed under strain control for different loading scenarios. An elastic–plastic constitutive model is developed using the finite element method to simulate the stabilised stress–strain response. Fatigue life predictions are made by applying strain-based, energy-based, and SWT-based methods. The SWT-based model properly captured the effect of load history on fatigue behaviour. In addition, fatigue life predictions carried out using the numerical simulations were in agreement with the experimental results.

本文研究了加载历史对 7075-T651 铝合金在两步加载下循环变形和疲劳行为的影响。高-低和低-高序列，包括对称和非对称步骤，在不同载荷情况下的应变控制下执行。使用有限元方法开发了一个弹塑性本构模型来模拟稳定的应力应变响应。疲劳寿命预测是通过应用基于应变、基于能量和基于 SWT 的方法进行的。基于 SWT 的模型正确地捕捉了载荷历史对疲劳行为的影响。此外，使用数值模拟进行的疲劳寿命预测与实验结果一致。