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PLASTIC LIMIT LOADS FOR PIPE-IN-PIPES WITH CIRCUMFERENTIAL THROUGH-WALL CRACKS BASED ON FINITE ELEMENT ANALYSES

[+] Author and Article Information
Se-Chang Kim

School of Mechanical Engineering, Sungkyunkwan University 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 16419, Republic of Korea
cakepan0805@gmail.com

Jae-Boong Choi

School of Mechanical Engineering, Sungkyunkwan University 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 16419, Republic of Korea
boong33@skku.edu

Hyun-Su Kim

Power Engineering Research Institute, KEPCO E&C 269 Hyeoksin-ro, Gimcheon-si, Gyeongsangbuk-do 39660, Republic of Korea
hyunsu@kepco-enc.com

Nam-Su Huh

Department of Mechanical System Design Engineering, Seoul National University of Science and Technology 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of Korea
nam-su.huh@seoultech.ac.kr

Kyunghoon Kim

School of Mechanical Engineering, Sungkyunkwan University 2066 Seobu-ro, Jangan-gu, Suwon-si, Gyeonggi-do 16419, Republic of Korea
kenkim@skku.edu

1Corresponding author.

ASME doi:10.1115/1.4039846 History: Received December 13, 2017; Revised March 28, 2018

Abstract

Pipe-in-pipes are generally applied to the extreme environments such as deep-sea and next-generation reactors due to their functionality and robustness. Thus, it is important to estimate the fracture behaviors of pipe-in-pipes for integrity assessment of this unique piping system. In this work, the plastic collapse behaviors of pipe-in-pipes with circumferential through-wall cracks are investigated based on three-dimensional finite element limit analysis, where the crack is assumed to be located at the inner pipe of pipe-in-pipes. As for loading conditions, internal pressure, axial tension, and global bending moment are considered. In particular, the bending restraint effect induced by inter-connection between the inner and outer pipes of pipe-in-pipes are quantified through the finite element analyses considering a practical range of geometries of pipe-in-pipes. Based on the finite element analysis results, the tabular and closed-form solutions of the plastic limit loads of the circumferential through-wall cracked pipe-in-pipes are proposed, and then, validated against numerical simulations.

Copyright (c) 2018 by ASME
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