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Fully plastic crack opening analyses of complex-cracked pipes for Ramberg-Osgood materials

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Abstract

The plastic influence functions for calculating fully plastic Crack opening displacement (COD) of complex-cracked pipes were newly proposed based on systematic 3-dimentional (3-D) elastic-plastic Finite element (FE) analyses using Ramberg-Osgood (R-O) relation, where global bending moment, axial tension and internal pressure are considered separately as a loading condition. Then, crack opening analyses were performed based on GE/EPRI concept by using the new plastic influence functions for complex-cracked pipes made of SA376 TP304 stainless steel, and the predicted CODs were compared with FE results based on deformation plasticity theory of tensile material behavior. From the comparison, the confidence of the proposed fully plastic crack opening solutions for complex-cracked pipes was gained. Therefore, the proposed engineering scheme for COD estimation using the new plastic influence functions can be utilized to estimate leak rate of a complex-cracked pipe for R-O material.

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Authors and Affiliations

  1. School of Mechanical Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do, 16419, Korea

    Jae-Uk Jeong & Jae-Boong Choi

  2. Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul, 01811, Korea

    Nam-Su Huh

  3. Department of Mechanical Engineering, Korea University, Seoul, 02841, Korea

    Yun-Jae Kim

Authors
  1. Jae-Uk Jeong
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  2. Jae-Boong Choi
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  3. Nam-Su Huh
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  4. Yun-Jae Kim
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Corresponding author

Correspondence to Nam-Su Huh.

Additional information

Jae-Uk Jeong is a Post-Doc. researcher of Mechanical Engineering at Sungkyunkwan University, Korea. He received his B.S., M.S. and Ph.D. from Sungkyunkwan University in 2007, 2009 and 2015, respectively. His research interests include structural integrity assessment and computational fracture mechanics.

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

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Jeong, JU., Choi, JB., Huh, NS. et al. Fully plastic crack opening analyses of complex-cracked pipes for Ramberg-Osgood materials. J Mech Sci Technol 30, 1563–1572 (2016). https://doi.org/10.1007/s12206-016-0311-6

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  • DOI: https://doi.org/10.1007/s12206-016-0311-6

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