Experimental and Numerical Studies on the Role of Dynamic Stress in Vibratory Stress Relieving Process

This work aims to measure the dynamic stress in specimens during vibration treatment and to judge its relation with the relaxation of residual stress. Specimens with residual stress were vibrated at natural frequency on a dynamic shaker with different accelerations (different applied loads). Dynamic stress was calculated from dynamic strain that was measured with a strain gauge on the specimen surface. Residual stress in the specimens before and after vibratory stress relief was measured by hole drilling method. Finite element analysis for the specimens was performed at natural frequency with various applied loads. Results from experiments and simulation have shown a nonmonotonous dependence of residual stress reduction on applied load although dynamic stress monotonously increases as applied load increases. Stress reduction effectiveness increases as applied load increases due to dynamic stress increasing, but when the applied load exceeds some value stress reduction effectiveness decreases with increasing applied load. © 2022. Int. J. Mech. Eng. Rob. Res