crack propagation短语¹¹⁴⁴⁶⁷⁺⁴ 基本例句 裂纹扩展 Grain size had some effect on the rate ofcrack propagation.晶粒尺寸大小对裂纹扩展速率也有影响。 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。