The Manson-Halford (M−H) nonlinear fatigue damage model is widely used for fatigue damage analysis. It, however, does not consider the load interaction effect. This paper presents an improved M−H model with a load interaction factor defined as the ratio of the first and second stress levels. The characteristic exponent of the M−H model is modified by multiplying the load interaction factor and fatigue life ratio. The characteristic exponent can consider the load interaction effect and the load sequence effect under multi-level loading. Experimental data from five materials under two-level and multi-level stress loadings verify the accuracy of the proposed model.

Manson-Halford (M − H) 非线性疲劳损伤模型广泛用于疲劳损伤分析。但是，它没有考虑负载交互作用。本文提出了一种改进的 M - H 模型，其载荷相互作用因子定义为第一和第二应力水平的比率。M-H 模型的特征指数是通过乘以载荷相互作用因子和疲劳寿命比来修改的。特征指数可以考虑多级载荷下的载荷相互作用效应和载荷序列效应。来自五种材料在两级和多级应力载荷下的实验数据验证了所提出模型的准确性。