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.
- Pipeline Division
Effect of Pre-Deformation on Fatigue Crack Propagation Life of X60 Pipeline Steel
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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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