FRACTURE CHARACTERS OF SURFACE CRACK IN THE INNER UPSET TRANSITIONAL SECTION OF DRILL PIPE
During the drilling operation,the drill pipe near the surface usually stands the largest tension and torsion.Stress concentration is relatively serious in the upset transitional section of the drill pipe,where initiation of fatigue cracks,washouts and even fracture accidents are prone to happening.B...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Journal of Mechanical Strength
2017-01-01
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| Series: | Jixie qiangdu |
| Subjects: | |
| Online Access: | http://www.jxqd.net.cn/thesisDetails#10.16579/j.issn.1001.9669.2017.04.031 |