Evolution of residual stresses with fatigue loading and subsequent crack growth in a welded aluminium alloy middle tension specimen

C. D.M. Liljedahl, Jeffrey Meng Lee Tan, O. Zanellato, S. Ganguly, M. E. Fitzpatrick, L. Edwards

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Neutron diffraction has been used to measure the evolution of the residual stresses in a VPPA welded Al-2024 alloy middle tension (M(T)) specimen with fatigue loading and subsequent crack growth. The measurements were carried out on the diffractometer ENGIN-X, a time-of-flight instrument, at the ISIS Pulsed Neutron Source. Fatigue crack growth was performed in situ and strain measurements averaged through the thickness of the specimen were made along two orthogonal directions as the crack grew, allowing the stresses in the specimen to be calculated assuming plane stress. 2D finite element simulation of the evolution of the initial residual stress field with crack growth, using an elastic model produced predictions that were in reasonable agreement with the experimental results. The results further indicate that some re-distribution of the residual stress field occurred due to the crack tip plasticity associated with the fatigue loading.

Original languageEnglish
Pages (from-to)3881-3894
Number of pages14
JournalEngineering Fracture Mechanics
Volume75
Issue number13
Early online date4 Mar 2008
DOIs
Publication statusPublished - 1 Sep 2008
Externally publishedYes

Keywords

  • Fatigue crack growth
  • Neutron diffraction
  • Residual stresses
  • Weld

ASJC Scopus subject areas

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

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