Engineering J estimation methods for leak-before-break analyses of nuclear piping

Yun Jae Kim; Nam Su Huh; Young Jin Kim

doi:10.1299/jsmea.48.41

Engineering J estimation methods for leak-before-break analyses of nuclear piping

Yun Jae Kim, Nam Su Huh, Young Jin Kim

Dept. of Mechanical System and Design Engineering

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

The present work presents a method to estimate elastic-plastic J for circumferential through-wall cracked pipes for the Leak-Before-Break (LBB) analysis of pressurized piping. The proposed method is based on the GE/EPRI approach and the key issue is to propose a robust Ramberg-Osgood fitting procedure. Two different estimation schemes are given, one for the case when full stress-strain data are available, and the other for the case when only yield and ultimate tensile strengths are available. The proposed J estimates are compared with those from extensive elastic-plastic finite element (FE) analyses. Experimental validation is also performed by comparing maximum moments predicted by fracture mechanics analysis using the proposed J estimates with those from full-scale pipe test. Both results show sufficient confidence in the accuracy of the proposed J estimates.

Original language	English
Pages (from-to)	41-50
Number of pages	10
Journal	JSME International Journal, Series A: Solid Mechanics and Material Engineering
Volume	48
Issue number	1
DOIs	https://doi.org/10.1299/jsmea.48.41
State	Published - Jan 2005

Keywords

Circumferential through-wall cracked pipe
GE/EPRI approach
J-integral
Leak-before-break analysis

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10.1299/jsmea.48.41

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title = "Engineering J estimation methods for leak-before-break analyses of nuclear piping",

abstract = "The present work presents a method to estimate elastic-plastic J for circumferential through-wall cracked pipes for the Leak-Before-Break (LBB) analysis of pressurized piping. The proposed method is based on the GE/EPRI approach and the key issue is to propose a robust Ramberg-Osgood fitting procedure. Two different estimation schemes are given, one for the case when full stress-strain data are available, and the other for the case when only yield and ultimate tensile strengths are available. The proposed J estimates are compared with those from extensive elastic-plastic finite element (FE) analyses. Experimental validation is also performed by comparing maximum moments predicted by fracture mechanics analysis using the proposed J estimates with those from full-scale pipe test. Both results show sufficient confidence in the accuracy of the proposed J estimates.",

keywords = "Circumferential through-wall cracked pipe, GE/EPRI approach, J-integral, Leak-before-break analysis",

author = "Kim, \{Yun Jae\} and Huh, \{Nam Su\} and Kim, \{Young Jin\}",

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AU - Kim, Yun Jae

AU - Huh, Nam Su

AU - Kim, Young Jin

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N2 - The present work presents a method to estimate elastic-plastic J for circumferential through-wall cracked pipes for the Leak-Before-Break (LBB) analysis of pressurized piping. The proposed method is based on the GE/EPRI approach and the key issue is to propose a robust Ramberg-Osgood fitting procedure. Two different estimation schemes are given, one for the case when full stress-strain data are available, and the other for the case when only yield and ultimate tensile strengths are available. The proposed J estimates are compared with those from extensive elastic-plastic finite element (FE) analyses. Experimental validation is also performed by comparing maximum moments predicted by fracture mechanics analysis using the proposed J estimates with those from full-scale pipe test. Both results show sufficient confidence in the accuracy of the proposed J estimates.

AB - The present work presents a method to estimate elastic-plastic J for circumferential through-wall cracked pipes for the Leak-Before-Break (LBB) analysis of pressurized piping. The proposed method is based on the GE/EPRI approach and the key issue is to propose a robust Ramberg-Osgood fitting procedure. Two different estimation schemes are given, one for the case when full stress-strain data are available, and the other for the case when only yield and ultimate tensile strengths are available. The proposed J estimates are compared with those from extensive elastic-plastic finite element (FE) analyses. Experimental validation is also performed by comparing maximum moments predicted by fracture mechanics analysis using the proposed J estimates with those from full-scale pipe test. Both results show sufficient confidence in the accuracy of the proposed J estimates.

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KW - Leak-before-break analysis

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Engineering J estimation methods for leak-before-break analyses of nuclear piping

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