This paper proposes a new method to estimate failure 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. The highlight of the proposed method is to propose a simple scheme to estimate the equivalent stress in the minimum ligament. Inspired by the reference stress method for approximate creep stress analysis, approximate estimation equations are proposed for the equivalent stress in the minimum ligament, which are then calibrated using detailed elastic-plastic three-dimensional FE analysis. Remarkably 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, which provides confidence in the use of the proposed method to assess local wall thinning in pipes. Furthermore, the proposed method is conceptually simple and thus easy to be extended to more complex situations.
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Technical Papers
Reference Stress Based Approach to Predict Failure Strength of Pipes With Local Wall Thinning Under Single Loading
Yun-Jae Kim,
Yun-Jae Kim
Department of Mechanical Engineering, Korea University, 1-5 Ka, Anam-dong, Sungbuk-gu, Seoul 136-701, Korea
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Do-Jun Shim,
Do-Jun Shim
SAFE Research Center, School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyonggi-do 440-746, Korea
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Hwan Lim,
Hwan Lim
SAFE Research Center, School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyonggi-do 440-746, Korea
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Young-Jin Kim
e-mail: yjkim50@skku.edu
Young-Jin Kim
SAFE Research Center, School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyonggi-do 440-746, Korea
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Yun-Jae Kim
Department of Mechanical Engineering, Korea University, 1-5 Ka, Anam-dong, Sungbuk-gu, Seoul 136-701, Korea
Do-Jun Shim
SAFE Research Center, School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyonggi-do 440-746, Korea
Hwan Lim
SAFE Research Center, School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyonggi-do 440-746, Korea
Young-Jin Kim
SAFE Research Center, School of Mechanical Engineering, Sungkyunkwan University, 300 Chunchun-dong, Jangan-gu, Suwon, Kyonggi-do 440-746, Korea
e-mail: yjkim50@skku.edu
Contributed by the Pressure Vessels and Piping Division for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received by the PVP Division December 12, 2002; revision received September 23, 2003. Associate Editor: R. J. Scavuzzo.
J. Pressure Vessel Technol. May 2004, 126(2): 194-201 (8 pages)
Published Online: May 5, 2004
Article history
Received:
December 12, 2002
Revised:
September 23, 2003
Online:
May 5, 2004
Citation
Kim, Y., Shim , D., Lim , H., and Kim, Y. (May 5, 2004). "Reference Stress Based Approach to Predict Failure Strength of Pipes With Local Wall Thinning Under Single Loading ." ASME. J. Pressure Vessel Technol. May 2004; 126(2): 194–201. https://doi.org/10.1115/1.1687379
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