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RESEARCH PAPERS

Fatigue Behavior of Line Pipes Subjected to Severe Mechanical Damage

[+] Author and Article Information
N. Hagiwara, N. Oguchi

Tokyo Gas Co., Ltd., Fundamental Technology Research Laboratory, 1-16-25, Shibaura, Minato-ku, Tokyo, 105-0023, Japan

J. Pressure Vessel Technol 121(4), 369-374 (Nov 01, 1999) (6 pages) doi:10.1115/1.2883717 History: Received July 31, 1998; Revised July 13, 1999; Online February 11, 2008

Abstract

Fatigue behavior of electrically resistance welded (ERW) line pipes with a gouge in a dent was experimentally investigated. After denting and machining a gouge, fluctuating internal pressure was applied to line pipes. The fatigue behavior differed above and below the threshold Q(Q th ), as a function of defect size and fracture toughness. When Q < Q th , ductile crack growth was observed with a consequent decrease in fatigue life. On the contrary, fatigue crack growth was observed when Q ≧ Q th . Fatigue life was predictable with an experimentally based power law equation incorporating dent depth, gouge depth, and hoop stress amplitude when Q ≧ Q th .

Copyright © 1999 by The American Society of Mechanical Engineers
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