The effect of weld residual stresses and their re-distribution with crack growth during fatigue under constant amplitude loading

C. D.M. Liljedahl, O. Zanellato, M. E. Fitzpatrick, J. Lin, L. Edwards

Research output: Contribution to journalArticle

52 Citations (Scopus)

Abstract

In this work the evolution of the residual stresses in a MIG-welded 2024-T3 aluminium alloy M(T) specimen during in situ fatigue crack growth at constant load amplitude has been measured with neutron diffraction. The plastic relaxation and plasticity-induced residual stresses associated with the fatigue loading were found to be small compared with the stresses arising due to elastic re-distribution of the initial residual stress field. The elastic re-distribution was modelled with a finite element simulation and a good correlation between the experimentally-determined and the modelled stresses was found. A significant mean stress effect on the fatigue crack growth rate was seen and this was also accurately predicted using the measured initial residual stresses.

Original languageEnglish
Pages (from-to)735-743
Number of pages9
JournalInternational Journal of Fatigue
Volume32
Issue number4
Early online date23 Oct 2009
DOIs
Publication statusPublished - 1 Apr 2010
Externally publishedYes

Keywords

  • Fatigue
  • Finite element analysis
  • Neutron diffraction
  • Residual stresses
  • Welding

ASJC Scopus subject areas

  • Modelling and Simulation
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering

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