Elastic-plastic fracture mechanics assessment of test data for circumferential cracked pipes

Yun Jae Kim, Do Jun Shim, Nam Su Huh, Young Jin Kim

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


This paper presents experimental validation of two reference stress based methods for circumferential cracked pipes. One is the R6 method where the reference stress is defined by the plastic limit load. The other is the enhanced reference stress method, recently proposed by the authors, where the reference stress is defined by the optimised reference load. Using 38 published pipe test data, the predicted maximum instability loads according to both methods are compared with the experimental ones for pipes with circumferential through-thickness cracks and with part circumferential surface cracks. It is found that the R6 method gives conservative estimates of the maximum loads for all cases. Ratios of the experimental maximum load to the predicted load range from 0.54 to 0.98. On the other hand, the proposed method gives overall closer maximum loads than R6, compared to the experimental data. However, for part through-thickness surface cracks, the estimated loads were slightly non-conservative for four cases, and possible reasons are fully discussed.

Original languageEnglish
Pages (from-to)173-191
Number of pages19
JournalEngineering Fracture Mechanics
Issue number2
Publication statusPublished - 2004 Jan
Externally publishedYes

Bibliographical note

Funding Information:
The authors are grateful for the support provided by a grant from Safety and Structural Integrity Research Centre at Sungkyunkwan University.


  • Circumferential through-thickness crack
  • Failure assessment diagram
  • J-integral
  • Maximum instability load
  • Part circumferential internal surface crack
  • Pipe test data
  • Reference stress

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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