Journal
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
Volume 82, Issue 7, Pages 546-552Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijpvp.2005.01.006
Keywords
pre-deformation; X60 pipeline steel; fatigue; crack initiation; energetic approach
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It is impossible to keep petroleum and natural gas transmission pipelines free from defects in the manufacturing, installation and servicing processes. The damage might endanger the safety of pipelines and even shorten their service life; gas or petroleum release due to defects may jeopardise the surrounding ecological environments with associated economic and life costs. 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 initiation life of pre-deformed X60 pipeline steel can be assessed by a previously proposed energetic approach. The threshold for crack initiation increases with the pre-deformation due to a strain hardening effect, while the fatigue resistant factor exhibits a maximum with pre-deformation owing to its special dependence on fracture strain and fracture strength. The result is expected to be beneficial to the understanding of the effect of damage on the safety of pipelines and fatigue life prediction. (c) 2005 Elsevier Ltd. All rights reserved.
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