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Estimation of tensile strain capacity for thin-walled API X70 pipeline with corrosion defects using the fracture strain criteria

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Abstract

Various tensile strain capacity (TSC) prediction equations have recently been presented by many research organizations such as Pipeline Research Council International and ExxonMobil Corporation. The gas industry uses these equations to determine the allowable strain for the cracked pipe. However, these TSC prediction equations cannot be applied to pipes with other defects such as corrosion or mechanical damage. Corrosion defects are the most common type of defect in actual operating conditions, and thus, they are an essential element for evaluating pipe structural integrity as they are most frequently connected to accidents. Therefore, it is necessary to develop a TSC prediction equation for corroded pipes. In this paper, to propose a new TSC prediction equation for corroded pipes, we conducted parametric finite element (FE) analyses using fracture strain criteria. To determine the appropriate fracture strain criteria, we reviewed several methods to construct the fracture locus. Then, we conducted parametric FE analyses using this fracture locus by considering variables affecting structural integrity, such as corrosion depth, corrosion length, wrap angle, and pressure ratio. Lastly, we presented the TSC prediction equation using these analyses.

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Abbreviations

ε f :

Fracture strain (strain to fracture initiation)

ε uEL :

Uniform elongation at ultimate tensile strength

σ y :

Yield strength of pipe material

σ UTS :

Ultimate tensile strength of pipe material

σ m :

Mean stress (hydrostatic stress)

σ eq :

Von Mises equivalent stress

σ h :

Hoop stress

αsl, σLu, m2 :

Parameters of the API 579 model

α, β, γ :

Parameters of the H-M model

n :

Strain hardening exponent of Hollomon equation

D o :

Outer diameter of a pipe

t :

Wall-thickness of a pipe

L c :

Length of the corrosion defect

d c :

Depth of the corrosion defect

W c :

Wrap angle of the corrosion defect

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Acknowledgments

This work was supported by the Nuclear Power Core Technology Development Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20171520101650).

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Authors and Affiliations

  1. Gas Infrastructure Research Division, Korea Gas Corporation (KOGAS) Research Institute, Ansan, 15328, Korea

    Ik-Joong Kim & Yun-Chan Jang

  2. Dept. of Mechanical System Design Engineering, Seoul National Univ. of Science and Technology, Seoul, 01811, Korea

    Youn-Young Jang, Ji-Hee Moon & Nam-Su Huh

Authors
  1. Ik-Joong Kim
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  2. Yun-Chan Jang
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  3. Youn-Young Jang
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  4. Ji-Hee Moon
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  5. Nam-Su Huh
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Corresponding author

Correspondence to Nam-Su Huh.

Additional information

Recommended by Editor Chongdu Cho

Ik-Joong Kim received M.S. in the Mechanical Engineering from Sungkyunkwan University, Seoul, Korea, in 2010. He is currently working at Korea Gas Corporation (KOGAS) Research Institute. His research interests include ductile damage modeling, finite element analysis and strain-based assessment of pipelines.

Nam-Su Huh received 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 Univ. of Science and Technology. His research interests include structural integrity assessment based on computational mechanics of materials.

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Kim, IJ., Jang, YC., Jang, YY. et al. Estimation of tensile strain capacity for thin-walled API X70 pipeline with corrosion defects using the fracture strain criteria. J Mech Sci Technol 34, 2801–2812 (2020). https://doi.org/10.1007/s12206-020-0613-6

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  • DOI: https://doi.org/10.1007/s12206-020-0613-6

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