The initial crack size was assumed through the visual inspection and the ultrasonic detection method.
在应用断裂力学时，采用了观测和超声波探测方法确定初始裂纹尺寸。
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。
Aim To study the critical crack and initial permissible crack size of gun tube.
目的研究火炮身管的临界裂纹和初始允许裂纹尺寸。
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