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.
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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