Numerical investigation on J-integral testing of heterogeneous fracture toughness testing specimens: Part I - Weld metal cracks

Y. J. Kim, J. S. Kim, K. H. Schwalbe, Y. J. Kim

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Based on extensive two-dimensional(2D) finite element (FE) analyses, the present work provides the plastic η factor solutions for fracture toughness J-integral testing of heterogeneous specimens with weldments. Solutions cover practically interesting ranges of strength mismatch and relative weld width, and are given for three typical geometries for toughness testing: a middle cracked tension (M(T)) specimen, single edge cracked bend (SE(B)) specimen and (C(T)) specimen. For mismatched M(T) specimens, both plane strain and plane stress conditions are considered, whereas for SE(B) and C(T) specimens, only the plane strain condition is considered. For all cases, only deep cracks are considered, and an idealized butt weld configuration is considered, where the weld metal strip has a rectangular cross section.Based on the present solutions for the strength mismatch effect on plastic η factors, a window is provided, within which the homogeneous J estimation procedure can be used for weldment toughness testing. The effect of the weld groove configuration on the plastic η factor is briefly discussed, concluding the need for further systematic analysis to provide guidance to practical toughness testing.

Original languageEnglish
Pages (from-to)683-694
Number of pages12
JournalFatigue and Fracture of Engineering Materials and Structures
Volume26
Issue number8
DOIs
Publication statusPublished - 2003 Aug 1

Keywords

  • Finite element analysis
  • J integral
  • Strength mismatch
  • Toughness testing
  • Weldment

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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