fatigue cracking的用法和樣例：
例句
- The reason of the increase of the impact fatigue life at normalizing and low temperature tempering was discussed.
分析了多衝疲勞裂紋擴展的行為，討論了正火低溫回火提高衝擊疲勞的原因。 - The fatigue crack growth experiments were performed according to the phenomena that crack occurred at PMMA in use.
根據外場使用中出現的裂紋現象，進行了疲勞裂紋擴展試驗。
