Finite element limit analyses of under-matched tensile specimens

Yun Jae Kim, Chang Sik Oh

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This paper quantifies the effect of under-matching on plastic limit loads and fully plastic stress triaxialities for mismatched flat plate (in plane strain and plane stress) and round bar tensile specimens, via parametric finite element (FE) limit analyses based on elastic-perfectly-plastic materials. It is found that the effect of the strength mismatch ratio (the ratio of the yield strength of the weld zone to that of the base material) on plastic limit loads and fully plastic stress triaxialities can be significant for plane strain plate and round bar specimens, but much less significant for plane stress plate specimens. Its effect is dependent significantly on the slenderness of the weld zone (defined by the ratio of the weld zone width to the specimen width). The effect of the slenderness of the weld zone is apparent only when the weld width is less than the specimen width or diameter. In particular, the stress triaxiality in the softer weld zone can increase significantly with decreasing the ratio of the weld zone width to the specimen width (radius). Based on the present limit load results, a simple method to extract intrinsic tensile properties of the under-matched weld zone from test results of under-matched tensile specimens is proposed.

Original languageEnglish
Pages (from-to)1362-1378
Number of pages17
JournalEngineering Fracture Mechanics
Volume73
Issue number10
DOIs
Publication statusPublished - 2006 Jul 1

    Fingerprint

Keywords

  • Constraint
  • FE limit analysis
  • Limit load
  • Tension test
  • Under-matched welded joint

ASJC Scopus subject areas

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

Cite this