Interfacial crack-tip constraints and J-integrals in plastically mismatached bi-materials

Hyungyil Lee, Yun Jae Kim

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


The effect of the T-stress and plastic mismatch on interfacial crack-tip stress under small scale yielding condition is investigated in this paper via detailed finite element analyses. The mismatch in plastic strength/hardening is focused, and plane strain elastic-plastic crack-tip fields have been modeled with modified boundary layer formulation. Plastic mismatches as well as compressive T-stresses in bi-material are shown to affect the interfacial crack-tip constraint substantially. Simple patching of slip-line fields is presented to characterize the interfacial crack-tip stress fields. Effects of T-stress and plastic hardening mismatch on asymmetry of the J-integral for bi-materials, and its implication on interfacial toughness are also discussed.

Original languageEnglish
Pages (from-to)1013-1031
Number of pages19
JournalEngineering Fracture Mechanics
Issue number8
Publication statusPublished - 2001 May 25
Externally publishedYes


  • Bi-material
  • Finite element analysis
  • Plastic mismatch
  • Strees triaxiality
  • T-stress

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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