Prediction of fatigue crack growth rate in welding residual stress field

Residual Stress Evaluation of AA2024-T3 Friction Stir Welded Joints

“…These residual stresses are likely to affect mechanical and corrosion properties of the materials and therefore to influence the in-service performance of structural components. The effects of residual stresses on the fatigue crack propagation have been reported by several authors such as Itoh et al (1989), Bussu and Irving (2003), Milan and Bowen (2002), Milan and Bowen (2003). Tensile residual stresses increase the crack growth rate by an increase in the effective stress ratio.…”

The significance of weld imperfections and surface peening on fatigue crack propagation life of butt-welded joints

“…On the other hand, compressive stresses on the surface of weldments can significantly improve the fatigue strength of welded structures. Itoh et al [5] studied the effect of residual stress on fatigue crack propagation rate in longitudinal welded residual stress field and found that the effect of crack growth rate in weld residual stress field could be evaluated in terms of the effective stress intensity range, based on the measurement of effective stress ratio and crack opening ratio. Kang et al showed [6] that the effective stress intensity factor and the effective stress ratio can be applied to predict fatigue crack growth rate in both tensile and compressive residual stress field by using base material's crack growth rate data with different stress ratio.…”

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

“…Another inherent inconvenience with welds is the residual stresses caused by the intense local heating. These stresses can significantly influence the fatigue life of engineering components [3][4][5][6]. Fail-safety and damage-tolerance regulations hence impose large safety factors where residual stresses may be present, and this reduces the weight competitiveness of integral structures.…”