循环加载与随机加载对疲劳损伤等效性的研究

Study of Equivalent about Fatigue Damage under Cyclic and Random Load

两种不同性质的载荷对疲劳损伤来说应采用完全不同的分析方法，但是从总的损伤累积效应来看，两类载荷作用的效果是相同的，就是使构件最终破坏。由此可见，两种载荷对损伤累积来说存在一定的内在关系。从损伤等效这一概念出发，导出了循环加载与随机加载对损伤的等效性关系，并给出了数值算法。

Different kind of method of analysis has to be adopted about fatigue damage under different kind of load as cyclic and random. But the total effect of accumulative damage is the same, that is to cause crack. From this point we can see, equivalent relation must exit of two kinds of load on about accumulative damage. The relation about damage has been presented in this paper of cyclic and random load on the concept of damage equivalent and then numerical calculation method has also been given.