首页|A new analytical model to predict residual stress induced by ultrasonic shot peening
A new analytical model to predict residual stress induced by ultrasonic shot peening
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NSTL
Elsevier
In this paper, a new analytical model of ultrasonic shot peening (USP) that can predict the impact velocity and the residual stress distribution was proposed and verified by experiments and simulations. The motion law of a single sphere during USP and effect of ultrasonic vibration on restitution coefficient are analyzed and a formula that can estimate the rebound velocity of the sphere after collision with the ultrasonic sonotrode using initial velocity, ultrasonic amplitude and frequency was proposed. Then, an analytical model to predict the impact velocity of the spheres was proposed and verified by high-speed camera observation. Besides, based on Hertz contact theory and Hill's elastic-plastic spherical shell expansion theory, the conversion between hydrostatic pressure and Hertz pressure was realized. Then, a new analytical model that can predict the deformation extent, stress variation and residual stress distribution of the ideal elastic-plastic plate impacted by a rigid sphere with a certain velocity was proposed and verified by finite element simulations. Based on the above two models and the results of two different stress superposition methods, an analytical model that can estimate the impact velocity and the residual stress distribution of the USP-treated plate surface layer with the USP process parameters and material properties of the sphere, sonotrode and treated material was proposed and experimentally verified. The calculated results are consistent with the experimental results well.
NSTL
Elsevier
