机械零（构）件的寿命由裂纹形成时间（即疲劳寿命）和裂纹扩展寿命两部分组成。
The whole life of an equipment part consists of the crack forming life (i. e. , the fatigue life or the damage accumulation life) and the crack extension life.
利用MATLAB生成几组随机数来模拟参考裂纹尺寸和应力水平不同时的裂纹形成时间(TTCI)值，并以此检验了理论推导的正确性和合理性。
Finally, several groups of random Numbers were produced with MATLAB to simulate TTCI values when cracks propagated, with which correctness and rationality of theoretical deduction were verified.
对于不同应力水平作用下的循环时间可计时累加并再现，可为疲劳裂纹形成寿命的预测提供依据。
The circle time under different stress level is accumulated and can be reappeared, so that the basis data is provided to predict surface fatigue crack forming life.
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