Crack-Tip Stress Field of Cracked Pipe under Combined Tension and Thermal Load

J. H. Je, H. S. Lee, D. J. Kim, Y. J. Kim

Research output: Contribution to journalConference articlepeer-review


In the presence of excessive plasticity, the fracture toughness depends on the size and geometry. For material under fully yielded conditions, the stresses near the crack tip are not unique, but depend on geometry. So Single-parameter; J-approach is limited to high-constraint crack geometry. J-Q theory has been proposed in order to decide crack geometry constraint. This approach assumes that the crack-tip fields have two degrees of freedom. In this paper, based on J-Q theory, crack-tip stress field of fully circumferential cracked pipe under combined load is investigated using FE analysis. Combined loads are tensile axial force and thermal gradient of radial direction. Q-stresses of a crack geometry and it's loading state are used to determine constraint effect, and give a characteristic order for crack-tip constraint.

Original languageEnglish
Pages (from-to)1686-1694
Number of pages9
JournalProcedia Engineering
Publication statusPublished - 2015
Externally publishedYes
Event14th International Conference on Pressure Vessel Technology, 2015 - Shanghai, China
Duration: 2015 Sept 232015 Sept 26


  • Combined load
  • Crack-tip Constraint
  • Cracked pipe
  • Q-stress

ASJC Scopus subject areas

  • General Engineering


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