Constraint of semi-elliptical surface cracks in T and L-joints

Hyungyil Lee, Yun Jae Kim

Research output: Contribution to journalArticlepeer-review


Critical defects in pressure vessels and pipes are generally found in the form of a semi-elliptical surface crack, and the analysis of which is consequently an important issue in engineering fracture mechanics. Furthermore, in addition to the traditional single parameter K or J-integral, the second parameter like T-stress should be measured to quantify the constraint effect. In this work, the validity of the line-spring model is investigated by comparing line-spring J-T solutions to the reference 3D finite element J-T solutions. A full 3D-mesh generating program for semi-elliptical surface cracks is employed to provide such reference 3D solutions. Then some structural characteristics of the surface-cracked T and L-joints are studied by mixed mode line-spring finite element. Negative T-stresses observed in T and L-joints indicate the necessity of J-T two parameter approach for analyses of surface-cracked T and L-joints.

Original languageEnglish
Pages (from-to)939-944
Number of pages6
JournalKey Engineering Materials
Volume326-328 II
Publication statusPublished - 2006
Externally publishedYes


  • Finite element analysis
  • J-integral
  • L-joint
  • Line-spring finite element
  • Semi-elliptical surface crack
  • T-joint
  • T-stress

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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