Numerical Study of Ultrasonic Vibration-Driven Shot Impact on Pure Copper

iming to investigate the effects of ultrasonic shot peening (USP) parameters on the USP-induced residual stresses and indentation profiles, a three-dimensional finite element model of ultrasonic vibration-driven shot impact on pure copper is developed, and the parametric analysis is detailedly investigated in terms of the shot size, horn surface topography, ultrasonic vibration frequency and horn vibration amplitude. The obtained results show that the ultrasonic vibration-driven shot impact frequency is improved by increasing the shot size. The stable shot velocity and the favorable in-depth residual stresses can be achieved by using the horn vibration amplitude of 80 μ m in the case of 6 mm shot diameter and 20 kHz ultrasonic vibration frequency. The USP-induced residual stresses in the subsurface layer present an insignificant sensitivity to the ultrasonic vibration frequency. The horn concave-convex surface leads to the significant change of the indentation locations and in-depth residual stresses.