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Reference Stress Approach for Failure Strength Estimates of a Pipe With Local Wall Thinning

[+] Author Affiliations
Yun-Jae Kim

Korea University, Seoul, Korea

Young-Jin Kim

Sungkyunkwan University, Suwon, Korea

Paper No. PVP2005-71551, pp. 753-759; 7 pages
  • ASME 2005 Pressure Vessels and Piping Conference
  • Volume 6: Materials and Fabrication
  • Denver, Colorado, USA, July 17–21, 2005
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4191-X | eISBN: 0-7918-3763-7
  • Copyright © 2005 by ASME


This paper proposes a method based on the reference stress a approach to estimate residual strength of a pipe with local wall thinning. The method is based on the equivalent stress averaged over the minimum ligament in the locally wall thinned region. Inspired by the reference stress method for approximate creep stress analysis, approximate estimation equations for the equivalent stress in the minimum ligament are proposed, which are then calibrated using detailed elastic-plastic 3-D FE analysis. The resulting estimation equations are found to be insensitive not only to pipe and defect geometries but also to material. Comparison of failure loads, predicted according to the proposed method, with published test data for corroded pipes shows excellent agreement.

Copyright © 2005 by ASME
Topics: Stress , Pipes , Failure



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