The role of residual stress and heat affected zone properties on fatigue crack propagation in friction stir welded 2024-T351 aluminium joints

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.…”

Numerical Study of the Mechanical Behavior and Fatigue in a Weld Bead by Friction Stir for a 6082-T6 Aluminum Alloy

“…They are of +30 MPa in the nucleus and +40 MPa in the HAZ. The crack propagation fatigue tests performed by [10] show that the rate of spread in the nugget, the HAZ and base (3) (2) metal for AA2024-T351 vary more in the longitudinal direction than in the direction cross. In addition, they report that the longitudinal fatigue crack growth threshold in the HAZ is about 10 MPa m 1 / 2 , compared to 5 MPa m 1 / 2 in the base metal.…”

“…The crack propagation in the weld bead (FSW and classic) is known to be concerned by residual stress and/or hardness around the welded zone [10] and [11]. [12] Conducted hardness tests on micro-specimen.…”

Simplified Thermo-Elastoplastic Numerical Modelling Techniques Applied to Friction Stir Welding of Mild Steel

“…For example, compressive residual stresses are well known to promote fatigue properties and corrosion resistance. John et al [13] and Bussu & Irving [14] have investigated the fatigue performance of friction stir welds and have shown that the welding residual stresses influence the fatigue performance of joints.…”