UOE linepipes have orthotropic work hardening in which the longitudinal (L-) stress vs. strain (SS) curve is different from the circumferential (C-) one. The anisotropy is emphasized by the thermal aging during the anti-corrosion coating. However, there are few studies on the effect of the circumferential mechanical properties on the compressive strain limit required in strain-based design (SBD). This paper describes the combined effect of SS curves in L- and the C-direction on the buckling resistance using the newly developed yield function to model the orthogonal anisotropy. The coupon tests after thermal aging during the anti-corrosion coating indicate that the L-SS curve can maintain the round-house type while the long yield point elongation (YPE) appears on the C-SS curve. Using these mechanical properties, FE-models demonstrate that YPE in the C-direction reduces the compressive strain limit for pipes with high diameter/thickness (D/t) under high internal pressure. Hence, SS curves in the C-direction should be considered for more reliable prediction of the buckling resistance required in long distance gas pipelines.
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2010 8th International Pipeline Conference
September 27–October 1, 2010
Calgary, Alberta, Canada
Conference Sponsors:
- International Petroleum Technology Institute and the Pipeline Division
ISBN:
978-0-7918-4423-6
PROCEEDINGS PAPER
Analytical Approach for Buckling Resistance of UOE Linepipe With Orthogonal Anisotropy Under Combined Loading
Eiji Tsuru,
Eiji Tsuru
Nippon Steel Corporation, Futtsu, Chiba, Japan
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Jun Agata,
Jun Agata
Nippon Steel Corporation, Futtsu, Chiba, Japan
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Yukinobu Nagata
Yukinobu Nagata
Nippon Steel Corporation, Futtsu, Chiba, Japan
Search for other works by this author on:
Eiji Tsuru
Nippon Steel Corporation, Futtsu, Chiba, Japan
Jun Agata
Nippon Steel Corporation, Futtsu, Chiba, Japan
Yukinobu Nagata
Nippon Steel Corporation, Futtsu, Chiba, Japan
Paper No:
IPC2010-31224, pp. 67-75; 9 pages
Published Online:
April 4, 2011
Citation
Tsuru, E, Agata, J, & Nagata, Y. "Analytical Approach for Buckling Resistance of UOE Linepipe With Orthogonal Anisotropy Under Combined Loading." Proceedings of the 2010 8th International Pipeline Conference. 2010 8th International Pipeline Conference, Volume 4. Calgary, Alberta, Canada. September 27–October 1, 2010. pp. 67-75. ASME. https://doi.org/10.1115/IPC2010-31224
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