The initial crack length of engineering components usually be defined subjectively but not objectively.
工程构件的初始裂纹长度是人为规定的，不具有客观性。
The distribution function of crack length at given time can be calculated by integration of the initial crack length distribution and the transition function of Markoff process.
文中导出了用初始裂纹长度的分布及马尔可夫转移概率密度函数计算给定时刻裂纹长度分布的积分公式。
Under the condition of the statistical parameters related to fatigue life of the structure, such as the initial crack length, the material toughness used, and the load acting on the structure being g…
在给定与疲劳寿命有关的各参数条件下求得动态可靠性曲线，从而在结构设计中根据可靠性要求确定或选择设计参数。
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