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End Boundary Effects on Local Buckling Response of High Strength Linepipe

[+] Author Affiliations
Ali Fatemi

IMV Projects Atlantic; Memorial University of Newfoundland, St. John’s, NL, Canada

Shawn Kenny

Memorial University of Newfoundland, St. John’s, NL, Canada

Farid Taheri

Dalhousie University, Halifax, NS, Canada

Da-Ming Duan, Joe Zhou

TransCanada PipeLines, Calgary, AB, Canada

Paper No. IPC2010-31397, pp. 205-212; 8 pages
doi:10.1115/IPC2010-31397
From:
  • 2010 8th International Pipeline Conference
  • 2010 8th International Pipeline Conference, Volume 4
  • Calgary, Alberta, Canada, September 27–October 1, 2010
  • Conference Sponsors: International Petroleum Technology Institute and the Pipeline Division
  • ISBN: 978-0-7918-4423-6 | eISBN: 978-0-7918-3885-3
  • Copyright © 2010 by ASME

abstract

In this paper, the significance of the length to diameter ratio (L/D) on the local buckling response was evaluated using continuum finite element modelling procedures. A numerical model was developed, using the finite-element simulator ABAQUS/Standard, to predict the local buckling and post-buckling response of high strength pipelines subject to combined state of loading. The numerical procedures were calibrated using test data from large-scale experiments examining the local buckling of high strength linepipe. The numerical model’s response was consistent with the measured experimental response for predicting the local buckling behavior well into the post-yield range. A parametric study was conducted to examine the significance of the linepipe L/D ratio with respect to the yield stress to ultimate stress ratio (Y/T) and hoop yield stress to longitudinal yield stress ratio or anisotropy factor (R). As the models with high L/D ratio exhibit global Euler-type response, a numerical algorithm was developed to calculate the local section moment response for the FE analysis. The analysis conducted provides insight on the significance of end effects on the local buckling response. There are questions on the approach taken by current industry practice with respect to establishing compressive strain limits for local buckling when using shorter linepipe segment lengths. The results from this study suggest end effects require assessment and potential mitigation.

Copyright © 2010 by ASME
Topics: Buckling

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