Piecing Failure Analysis of Drill Pipe Upset
2011 ◽
Vol 314-316
◽
pp. 1210-1213
Keyword(s):
The failure cause of Φ127mm G105 IEU drill pipe upset was investigated through mechanical properties testing, optical morphologies and fracture surface analysis. The result show that drill pipe upset’s failure reason is the elephant hide and decarburization layer in its out-surface caused by improper upset treatment in forging process. Elephant hide and decarburization layer existing in drill pipe upset changed seriously reduced its strength and fatigue property. Under the effect of alternating stresses, the crack first initiated from the deepest position of elephant hide and developed quickly. In the end, it leaded the drill pipe to early piecing failure.
2012 ◽
Vol 184-185
◽
pp. 248-251
2012 ◽
Vol 430-432
◽
pp. 598-601
Keyword(s):
Keyword(s):
2006 ◽
Vol 430
(1-2)
◽
pp. 1-8
◽
1990 ◽
Vol 15
(7)
◽
pp. 427-432
◽
Keyword(s):