中文摘要：

根据概率断裂力学的基本假设和当量初始缺陷尺寸（EIFS）分布参数的通用性要求，推导了结构细节EIFS分布参数的通用性条件，研究了裂纹萌生时间分布参数在参考裂纹尺寸和应力水平不同时的变化规律，为细节EIFS分布参数的通用化处理提供了理论依据。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。

英文摘要：

According to the essential hypothesis of probabilistic fraclure mechanism and the generality requirement of Equivalent Initial Flaw Size（EIFS）distribution parameters, the generality condi tion of EIFS distribution parameters was deduced theoretically and the change rules of Time to Crack Initiation（TTCI）distribution parameters along crack--growth were studied, which provided theoretical basis for generalization of EIFS distribution parammers. Finally, several groups of random num bers were produced with MATLAB to simulate TTCI values when cracks propagated, with which correctness and rationality of theoretical deduction were verified.