... 疲劳裂纹扩展的门槛值 Fatigue crack growth threshold 疲劳延性系数 Fatigue ductility coefficient 疲劳寿命 Fatigue life ...
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It is necessary to elaborate on the definition of a fatigue coefficient such as that for ductility.
有必要对疲劳系数，如延性系数的定义作详细讨论。
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