Predicting failure response of spot welded joints using recent extensions to the Gurson model

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The plug failure modes of resistance spot welded shear-lab and cross-tension test specimens are studied, using recent extensions to the Gurson model. A comparison of the predicted mechanical response is presented when using either: (i) the Gurson-Tvergaard-Needleman model (GTN-model), (ii) the shear-modified GTN-model by Nahshon and Hutchinson that also describes damage development at low triaxiality (NH-model) or (iii) the Gologanu-Leblond-Devaux model (GLD-model) accounting for non-spherical void growth. The failure responses predicted by the various models are discussed in relation to their approximate description of the nucleation, growth and coalescence of microvoids. Using the void shape factor of the GLD-model, a simple approach for approximating void nucleation by either particle fracture or particle-matrix decohesion is applied and a study of the subsequent void shape evolution is presented. The models are applied to predict failure of specimens containing a fully intact weld nugget as well as a partly removed weld nugget to address the problems of shrinkage voids or larger weld defects. All analysis are carried out by full 3D finite element modelling.
Original languageEnglish
JournalComputational Materials Science
Volume48
Issue number1
Pages (from-to)71-82
ISSN0927-0256
DOIs
Publication statusPublished - 2010

Keywords

  • Shear modification
  • Gurson modelling
  • RSW
  • Void shape effects
  • Weld defects

Fingerprint Dive into the research topics of 'Predicting failure response of spot welded joints using recent extensions to the Gurson model'. Together they form a unique fingerprint.

Cite this