工程构件的初始裂纹长度是人为规定的，不具有客观性。
The initial crack length of engineering components usually be defined subjectively but not objectively.
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。
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.
进而分析了管道内压、壁厚、裂纹止裂长度和初始裂纹速度对裂纹驱动力(也即裂纹扩展)的影响。
Meanwhile, the influences of pipeline internal pressure, wall thickness, crack arrest length and initial crack velocity on the crack driving force (crack propagation) are further studied.
对弹塑性材料裂纹扩展阻力曲线是惟一的，与裂纹初始长度无关。
The material resistance curve is unique and independent on crack initial lengths.
首先将结构的初始损伤、使用过程中的损伤累积用主裂纹长度的分布加以定量描述。
The initial damage and the cumulative damage during operation are quantitatively measured with the main fatigue crack length in the structure.
循环续循环模拟计算出裂纹从初始长度一直到疲劳破坏的扩展曲线。
The fatigue crack growth curve from initial crack size till fatigue failure is simulated step by step.
循环续循环模拟计算出裂纹从初始长度一直到疲劳破坏的扩展曲线。
The fatigue crack growth curve from initial crack size till fatigue failure is simulated step by step.
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