It is impossible to keep oil and gas pipeline free from defects in fabrication, installation and serving processes. Mechanical damage is one of import causes of pipeline failure accidents. Mechanical damage might endanger the safety of pipelines and even shorten their service life. Pre-tensile deformation of X60 steel is employed to experimentally simulate the influence of dents on the fatigue crack initiation life. The investigation indicates that the fatigue crack propagation life of pre-deformed X60 pipeline steel can be predicted using a previously proposed equation, i.e., da/dN = B(ΔK − ΔKth)2. The threshold ΔKth for fatigue crack propagation decreases with the pre-deformation. The fatigue crack propagation coefficient B increases with the pre-deformation. So pre-deformation accelerates fatigue crack propagation and shortens fatigue life. The result is expected to be beneficial to the understanding of the effect of dents on the safety of pipelines and fatigue life prediction.
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2006 International Pipeline Conference
September 25–29, 2006
Calgary, Alberta, Canada
Conference Sponsors:
- Pipeline Division
ISBN:
0-7918-4262-2
PROCEEDINGS PAPER
Effect of Pre-Deformation on Fatigue Crack Propagation Life of X60 Pipeline Steel Available to Purchase
Xinwei Zhao,
Xinwei Zhao
Tubular Goods Research Center of CNPC, Xi’an, Shaanxi, China
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Jinheng Luo,
Jinheng Luo
Tubular Goods Research Center of CNPC, Xi’an, Shaanxi, China
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Rong Wang,
Rong Wang
Xi’an Petroleum University, Xi’an, Shaanxi, China
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Maosheng Zheng,
Maosheng Zheng
Xi’an Jiaotong University, Xi’an, Shaanxi, China
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Baosheng Dong
Baosheng Dong
Tubular Goods Research Center of CNPC, Xi’an, Shaanxi, China
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Xinwei Zhao
Tubular Goods Research Center of CNPC, Xi’an, Shaanxi, China
Jinheng Luo
Tubular Goods Research Center of CNPC, Xi’an, Shaanxi, China
Rong Wang
Xi’an Petroleum University, Xi’an, Shaanxi, China
Maosheng Zheng
Xi’an Jiaotong University, Xi’an, Shaanxi, China
Baosheng Dong
Tubular Goods Research Center of CNPC, Xi’an, Shaanxi, China
Paper No:
IPC2006-10192, pp. 337-343; 7 pages
Published Online:
October 2, 2008
Citation
Zhao, X, Luo, J, Wang, R, Zheng, M, & Dong, B. "Effect of Pre-Deformation on Fatigue Crack Propagation Life of X60 Pipeline Steel." Proceedings of the 2006 International Pipeline Conference. Volume 2: Integrity Management; Poster Session; Student Paper Competition. Calgary, Alberta, Canada. September 25–29, 2006. pp. 337-343. ASME. https://doi.org/10.1115/IPC2006-10192
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