机器中的某些另构件有时因受到周期性变化的负荷作用而发生严重的疲劳断裂损坏事故。针对这个问题本文特介绍一种利用断裂力学方法来监视零构件裂纹的扩展,以避免零构件因疲劳而发生断裂事故。 经典的分析方法,诸如S—N曲线及古德曼图,主要是依据对破损事例的统计资料来预测零件的疲劳寿命。这种预测经证明充其量只不过是一种估计,因为它们的准确性局限于疲劳试验中所得到的参数。 Some of the other components in the machine are sometimes subject to severe fatigue failure due to cyclical loads. In response to this problem, this paper introduces a method using the fracture mechanics to monitor the expansion of the crack components to avoid fatigue failure occurred due to component failure. Classic analytical methods, such as S-N curves and Goodman diagrams, predict the fatigue life of a part based primarily on the statistical data of broken cases. This prediction has proved to be at best an estimation as its accuracy is limited to the parameters obtained in fatigue tests.