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Finite Element Plastic Limit Loads of Complex Cracks in Pipes with Two-Layered Materials

[+] Author and Article Information
Da-Som Jeon

Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Republic of Korea
kokio126@seoultech.ac.kr

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

Do Jun Shim

Structural Integrity Associates, 5215 Hellyer Avenue, Suite 210, San Jose, CA 95138, U.S.A.
dshim@structint.com

Sang-Min Lee

Korea Institute of Nuclear Safety, 62 Gwahak-ro, Yuseong-gu, Daejeon 34142, Republic of Korea
sangmin.lee@kins.re.kr

1Corresponding author.

ASME doi:10.1115/1.4042444 History: Received April 06, 2018; Revised December 21, 2018

Abstract

Based on the detailed three-dimensional (3-D) finite element (FE) limit analyses, the present study investigates the plastic limit loads of complex-cracked pipes with two-layered materials for determining maximum load carrying capacity or critical crack length of pipe with two-layered materials. The complex cracks in pipes with two-layered materials consist of a partial through-wall crack and 360-degree circumferential surface crack in the inner side of pipe in the same plane in pipe, which could be developed in the preemptive weld overlay region on the dissimilar metal weld of nuclear pipe. For FE limit analyses for complex-cracked pipes with two-layered materials, total thickness of pipe, depth of internal surface crack, length of partial through-wall crack and the effect of strength mismatch are systematically considered. As for loading conditions, axial tension, global bending and internal pressure are employed, and then, the confidence of the present FE procedure is con?rmed by comparing the FE results with the existing solutions for complex cracks in single material. The results of the present FE plastic limit loads are compared with the existing solutions for complex-cracked pipes with two-layered materials. Also, a simple approach using equivalent single material based on the weighted average concept instead of using the properties of two materials is suggested for predicting plastic limit loads of two-layered materials. The present results can be applied to Leak-Before-Break (LBB) analyses of nuclear piping with overlay weld.

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