随机载荷下疲劳寿命预估计算方法研究

Research on an efficient calculating method for fatigue life predicting under random loading

分析了一种用于随机载荷下零构件疲劳寿命预估的有效计算方法 .引入材料所吸收的弹性应变能和塑性应变能等参量 ,在等能量损伤法则下推算出稳态条件下随机载荷的等价常幅应力 ,适用于结构设计阶段和改进阶段或应力响应时间历程无法实测的情况 .

In this paper, an efficient calculating method for fatigue life prediciting under random loading is analyzed. According to the damage principle of equivalent energy, the equivalent constant stress of the random loading in the steady state is deduced by introducing some parameters such as the elastic strain energy and plastic strain energy absorbed by material. The method is particularly useful for predicting the service life when structures and components are designed or improved.