Effect Of Residual Stresses Resulting From Plastic Beam Bending: Technique On Fatigue Crack Initiation

In this paper, effect of residual stresses resulting from plastic beam bending technique on fatigue crack growth initiation was investigated on 2024 T351 aluminium alloy. The residual stresses profiles were determined analytically and numerically using finite element method. In the analytical solution linear work-hardening behaviour were assumed. In the numerical calculations constitutive equations including isotropic work-hardening was introduced. Effect of applied bending load levels upper elastic behaviour generating residual stress field was studied on fatigue crack initiation. Numerical calculation was applied in this investigation. Fatigue initiation life was affected by compressive residual stress at small notch. Result shows that fatigue life was increased with increasing in levels of compressive residual stress. Additionally, effect of tensile residual stress was neglected due to obtained profile with numerical calculation where tested specimen is not sufficiently slender.