Determination of J-integral using the load-COD record for circumferential through-wall cracked pipes

Nam Su Huh, Yun Jae Kim

Research output: Contribution to journalArticle

3 Citations (Scopus)


The present paper provides experimental J estimation equation based on the load-crack opening displacement (COD) record for testing the circumferential through-wall cracked pipe under combined tension and bending. Based on the limit analysis and the kinematically admissible rigid-body rotation field, the plastic η-factorfor the load-COD record is derived and is compared with that for the load-load line displacement record. Comparison with the J results from detailed elastic-plastic finite element analysis shows that the proposed method based on the load-COD record provides reliable J estimates even for shallow cracks (small crack angle), whereas the conventional approach based on the load-load line displacement record gives erroneous results for shallow cracks. Thus, the proposed J estimation method could be recommended for testing the circumferential through-wall cracked pipe, particularly with shallow cracks.

Original languageEnglish
Pages (from-to)414021-414027
Number of pages7
JournalJournal of Pressure Vessel Technology, Transactions of the ASME
Issue number4
Publication statusPublished - 2008 Nov 1
Externally publishedYes



  • Circumferential through-wall cracked pipe
  • Combined tension and bending
  • Crack opening displacement
  • J testing
  • Plastic η-factor

ASJC Scopus subject areas

  • Safety, Risk, Reliability and Quality
  • Mechanics of Materials
  • Mechanical Engineering

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