The influences of random loading on strength degradation were studied,and a reliability model was proposed considering strength degradation and times of loading action.By calculating the equivalent loading,the process of strength degradation under random loading was transformed into a process under the deterministic loading,and the relationship between reliability and

times of loading action was obtained.Besides,the time-dependent reliability models under multi-loadings were established by analyzing the relationship between action times of different loadings and time.

分析了随机载荷大小对强度退化的影响,提出考虑强度退化和载荷作用次数的可靠度计算模型。该模型通过计算当量载荷,将随机载荷作用下的强度退化过程等效为确定性载荷作用下的退化过程,得到零件可靠度与载荷作用次数的关系,在此基础上,通过分析不同载荷出现次数与时间的关系,得到多个载荷共同作用下零件可靠度随时间的变化规律。

可靠性, 载荷, 载荷强度干涉, 泊松过程