Composite fatigue life prediction method considering loading cycle number

The invention provides a composite fatigue life prediction method considering a loading cycle number. The method comprises the following steps: acquiring a failure cycle number and a loading cycle number under low-cycle loading and high-cycle loading under a given condition; calculating an influence factor of the loading cycle number on the fatigue life; establishing an equivalent cycle number model capable of describing compound fatigue, and calculating an equivalent cycle number; calculating composite fatigue accumulated damage; and predicting the fatigue life under composite loading. According to the method, the composite fatigue life of the material can be accurately predicted, and reference is provided for reliability design of high-end equipment. 本发明提供了一种考虑加载循环数的复合疲劳寿命预测方法，所述方法包括：获取给定条件下的低周加载、高周加载下的失效循环数以及加载循环数；计算加载循环数对疲劳寿命的影响因子；建立能够描述复合疲劳的等效循环数模型，计算等效循环数；计算复合疲劳累积损伤；以及预测复合加载下的疲劳寿命。本发明方法可准确的预测材料的复合疲劳寿命，为高端装备的可靠性设计提供参考。