Crack size prediction under variable amplitude loading is a very complex process, which is also important for life prediction in engineering. A crack growth model considering different stress ratio for fatigue remaining life prediction is proposed in this paper. The model utilizes stress ratio to describe the variable loading sequences, which makes the calculation greatly simplified. The rain-flow method is utilized to characterize the load sequence effects under variable amplitude loading. In addition, particle filter is utilized to estimate the model parameters describing the crack growth. Finally, case study indicates that the proposed approach is efficient in predicting crack growth and fatigue remaining life.

可变振幅载荷下的裂纹尺寸预测是一个非常复杂的过程，这对于工程中的寿命预测也很重要。提出了一种考虑不同应力比的裂纹扩展模型，以预测疲劳剩余寿命。该模型利用应力比来描述变量加载顺序，从而大大简化了计算。雨流法被用来表征可变振幅载荷下的载荷序列效应。另外，利用粒子滤波器估计描述裂纹扩展的模型参数。最后，案例研究表明，所提出的方法在预测裂纹扩展和疲劳剩余寿命方面是有效的。