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Prediction of fracture parameters of circumferential through-wall cracks in the interface between an elbow and a pipe under internal pressure

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An Erratum to this article was published on 18 April 2018

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Abstract

This paper provides plastic influence functions of GE/EPRI method for calculating J and Crack opening displacement (COD) of pipes with a circumferential Through-wall crack (TWC) in the interface between an elbow and a straight pipe by using 3-dimensional (3-D) elastic-plastic finite element analyses for Ramberg-Osgood (R-O) materials, in which internal pressure was considered as a loading condition. The proposed plastic influence functions are tabulated as a function of the pipe geometries, crack length and strain hardening exponent. In order to provide sufficient confidence for the proposed plastic influence functions, the estimation scheme using the proposed plastic influence functions for J and COD of cracked elbows was validated against FE results using R-O parameters for the SA312 TP316 stainless steel. Moreover, the predicted J and COD for elbows with a TWC in the interface between an elbow and a pipe by the proposed scheme were compared with those for cracked straight pipes to investigate the effect of the elbow geometries on crack behavior of elbows. One important point is that crack behaviors in the interface between an elbow and a straight pipe can be significantly different with those in straight pipes according to pipe thickness, crack length and bend radius of elbows. Thus, the proposed plastic influence functions can be useful to predict accurate J and COD for cracked elbows.

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  • 18 April 2018

    There are two corrections to make to the original article.

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Authors and Affiliations

  1. Dept. of Mechanical System Design Engineering, Seoul Nat’l Univ. of Science and Technology, Seoul, 01811, Korea

    Youn-Young Jang & Nam-Su Huh

  2. Global Turbine R&D Center, Doosan Heavy Industries & Construction, Changwon, Gyeongnam, 51711, Korea

    Jae-Uk Jeong

Authors
  1. Youn-Young Jang
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  2. Jae-Uk Jeong
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  3. Nam-Su Huh
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Corresponding author

Correspondence to Nam-Su Huh.

Additional information

Recommended by Editor Chongdu Cho

Youn-Young Jang is a Master student of the Department of Mechanical System Design Engineering, Seoul National University of Science and Technology. His research interests include structural integrity assessment based on computational fracture mechanics.

Nam-Su Huh received his B.S., M.S. and Ph.D. degrees in the mechanical engineering from Sungkyunkwan University, Korea, in 1996, 1998 and 2001, respectively. He is currently a Professor at the Department of Mechanical System Design Engineering, Seoul National University of Science and Technology. Prof. Huh’s research interests include structural integrity assessment based on computational mechanics of materials.

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Jang, YY., Jeong, JU. & Huh, NS. Prediction of fracture parameters of circumferential through-wall cracks in the interface between an elbow and a pipe under internal pressure. J Mech Sci Technol 30, 4217–4226 (2016). https://doi.org/10.1007/s12206-016-0834-x

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  • DOI: https://doi.org/10.1007/s12206-016-0834-x

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