Through failure analysis of a fractured tubing in Daqing oil fields, we have concluded that it is a fatigue fracture of the tubing, and what led to the cracks in the bottom of the tubing threads is the original cutting marks.
油管螺纹齿底的原始加工刀痕是造成裂纹萌生的主要原因,萌生的裂纹在油管承受的拉-拉脉动载菏作用下发生疲劳扩展,最后导致油管断裂失效。
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