Research Papers: Design and Analysis

Plastic Limit Loads for Pipe-in-Pipes With Circumferential Through-Wall Cracks Based on Finite Element Analyses

[+] Author and Article Information
Se-Chang Kim, Jae-Boong Choi

School of Mechanical Engineering,
Sungkyunkwan University,
2066 Seobu-ro, Jangan-gu,
Suwon-si 16419, Gyeonggi-do, South Korea

Hyun-Su Kim

Power Engineering Research Institute,
269 Hyeoksin-ro,
Gimcheon-si 39660,
Gyeongsangbuk-do, South Korea

Nam-Su Huh

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

Kyunghoon Kim

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

1Corresponding authors.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 13, 2017; final manuscript received March 28, 2018; published online April 25, 2018. Assoc. Editor: Kiminobu Hojo.

J. Pressure Vessel Technol 140(3), 031202 (Apr 25, 2018) (9 pages) Paper No: PVT-17-1259; doi: 10.1115/1.4039846 History: Received December 13, 2017; Revised March 28, 2018

Pipe-in-pipes (PIPs) 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 PIPs for integrity assessment of this unique piping system. In this work, the plastic collapse behaviors of PIPs with circumferential through-wall cracks (TWCs) are investigated based on three-dimensional finite element (FE) limit analysis, where the crack is assumed to be located at the inner pipe of PIPs. As for loading conditions, internal pressure, axial tension, and global bending moment are considered. In particular, the bending restraint effect induced by interconnection between the inner and outer pipes of PIPs is quantified through the FE analyses considering a practical range of geometries of PIPs. Based on the FE analysis results, the tabular and closed-form solutions of the plastic limit loads of the circumferential through-wall cracked PIPs are proposed, and then, validated against numerical simulations.

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Fig. 1

Schematic illustrations for the PIP with the circumferential TWC

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Fig. 2

Typical FE model of the PIP employed in the present study

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Fig. 3

Expansion of yield region on the cross section of a cracked PIP as increasing global bending moment, in order from 1 to 6 (Rm/t = 5, θ/π = 0.4375, Rm,o/Rm = 1.75, and to/t = 0.25)

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Fig. 4

Comparisons of the proposed estimations with the FE results of PIPs with the circumferential TWCs for (a) internal pressure, (b) axial tension, and (c) global bending moment (Rm/t = 10 and to/t = 1)

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Fig. 5

Effects of crack location on the plastic limit load of PIPs under global bending moment (Rm/t = 5, θ/π = 0.5, Rm,o/Rm = 1.3, and to/t = 0.25)

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Fig. 6

FE model of the PIP with the circumferential TWC located at Lc/Rm = 0.2

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Fig. 7

Comparison of plastic deformation near the crack location with (a) contact and (b) noncontact conditions under internal pressure (Rm/t = 5, θ/π = 0.5, Rm,o/Rm = 1.3, and to/t = 1)




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