crack propagation

• 裂纹扩展

crack propagation的用法和样例：

例句

1. Grain size had some effect on the rate of crack propagation.
   晶粒尺寸大小对裂纹扩展速率也有影响。
2. The fatigue crack growth experiments were performed according to the phenomena that crack occurred at PMMA in use.
   根据外场使用中出现的裂纹现象，进行了疲劳裂纹扩展试验。