Fatigue can be studied with fracture mechanics and life can be evaluated from crack initiation, extension and fracture.
疲劳破坏的研究可以从断裂力学入手,从裂纹萌生、扩展与断裂三个阶段进行寿命的评估。
参考来源 - 铁磁性材料拉伸疲劳的磁记忆信号研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Improper rework practices can result in unscheduled maintenance or surface damage that causes crack initiation.
翻修不当可能会造成非计划性维修和表面损伤从而造成裂纹。
The fractography of the fatigue crack initiation displayed cleavage facet and more second cracks after pre-training.
裂纹形成的断裂为穿晶解理机制，预应变可导致更多的二次裂纹。
Plating into a transition (radius transition or undercut) will create a stress concentration that can cause crack initiation.
如果过渡段被电镀(倒角和内切槽)将会产生应力集中，造成裂纹。
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