The effect of weld residual stresses and their re-distribution with crack growth during fatigue under constant amplitude loading
✍ Scribed by C.D.M. Liljedahl; O. Zanellato; M.E. Fitzpatrick; J. Lin; L. Edwards
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 828 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0142-1123
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✦ Synopsis
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.