Crack opening analysis of complex cracked pipes

Yun Jae Kim, Nam Su Huh, Young Jin Kim

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Based on the reference stress approach, two sets of the crack opening displacement (COD) estimation equations are proposed for a complex cracked pipe. One set of equations can be used for the case when full stress-strain data are known, and the other for the case when only yield and tensile strengths are available. To define the reference stress, a simple plastic limit analysis for the complex cracked pipe subject to combined bending and tension is performed, considering the crack closure effect in the compressive-stressed region. Comparison with ten published test data and the results from the existing method shows that the present method not only reduces non-conservatism associated with the existing method, but also provides consistent and overall satisfactory results. These results provide sufficient confidence in the use of the present method to estimate the COD (and thus the leak rate) for the Leak-before-Break (LBB) analysis of complex cracked pipes. Finally, the J-estimation equations are also provided for complex cracked pipes, for the LBB analysis of complex cracked pipes.

Original languageEnglish
Pages (from-to)71-86
Number of pages16
JournalInternational Journal of Fracture
Issue number1
Publication statusPublished - 2001 Sept
Externally publishedYes


  • Complex cracked pipe
  • Crack opening displacement
  • J-integral
  • Leak-before-break
  • References stress approach

ASJC Scopus subject areas

  • Computational Mechanics
  • Modelling and Simulation
  • Mechanics of Materials


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