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

Yun Jae Kim, Nam Su Huh, Young Jin Kim

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


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 languageEnglish
Pages (from-to)41-50
Number of pages10
JournalJSME International Journal, Series A: Solid Mechanics and Material Engineering
Issue number1
Publication statusPublished - 2005 Jan
Externally publishedYes


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

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering


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