疲劳裂纹

fatigue cracking的用法和样例：

例句

The reason of the increase of the impact fatigue life at normalizing and low temperature tempering was discussed.分析了多冲疲劳裂纹扩展的行为，讨论了正火低温回火提高冲击疲劳的原因。
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。

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