Effect of weld residual stresses and their re-distribution with crack growth during fatigue under constant amplitude loading
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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. © 2010, Elsevier Ltd.
Neutron diffraction, Residual stresses, Fatigue, Welding, Finite element method, Crack propagation
Liljedahl, C. D. M., Zanellato, O., Fitzpatrick, M. E., Lin, J., & Edwards, L. (2010). Effect of weld residual stresses and their re-distribution with crack growth during fatigue under constant amplitude loading. International Journal of Fatigue, 32(4), 735-743. doi:10.1016/j.ijfatigue.2009.10.012