tool clear of work
... tool chest 工具箱 tool clear of work 工件刀痕 tool failure 工具失灵 ...
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工件内表面存在刀痕等机加工缺陷，造成应力集中促进了裂纹的形式。
The manufactured defects on the inside of the drilling collar as stress concentration location play an important part in the initiation of the cracks.
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