... crack filler 填缝料 crack formation life 裂纹生成寿命 crack front 裂纹前缘，裂纹端部 ...
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During the fatigue process, the formation of the main crack expends most of the whole fatigue life, and once the main crack forms, the crack propagates rapidly and fractures immediately.
疲劳过程中主裂纹的形成消耗了大部分的疲劳寿命，一旦主裂纹形成就快速扩展瞬间断裂。
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