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Effect of friction factor and bullet deformation on ultrasonic peening of pure copper
Published:2023-11-01 author:TAO Xinrong, WANG Cheng, ZHONG Yao, et al. Browse: 1049 Check PDF documents
Effect of friction factor and bullet deformation on ultrasonic peening 
of pure copper


TAO Xinrong1, WANG Cheng1, 2, ZHONG Yao1, ZHOU Bin1, HUANG Haiquan1, SU Qi1


(1.School of Mechanical Engineering, Anhui University of Science and Technology, Huainan 232001, China; 2.Collaborative 

Innovation Center of Highend Laser Manufacturing Equipment Co-sponsored by Ministry and Province, Hangzhou 310023, China)


Abstract:  In the existing finite element models of ultrasonic shot peening, most of them ignore the influence of elastic and plastic deformation of the projectile on the numerical simulation results. There are few reports on the influence of the friction coefficient between the surface of the projectile and the surface of the sprayed material on the numerical prediction results of ultrasonic shot peening. Therefore, taking pure copper as the research object, the influence of friction coefficient and projectile deformation on pure copper by ultrasonic shot peening was studied by combining the ultrasonic shot peening experiment and numerical simulation process. Firstly, a three-dimensional finite element model of single ultrasonic shot peening was established based on ABAQUS platform. Then, the single ultrasonic shot peening experiment was designed, and the influence of shot peening distance on velocity was analyzed according to the experimental conditions. The experimental conditions were input into the simulation model, and the experimental and simulation results were compared from the aspects of shot velocity and indentation morphology. Finally, under the condition of friction coefficient of 0.1,0.2,0.3,0.4 and 0.5, the ultrasonic shot peening numerical simulation of pure copper specimens was carried out by respectively using rigid shot, elastic shot and elastic-plastic shot. The surface morphology and residual stress of the treated surface were analyzed. The obtained results show that when the friction coefficient between the shot and the pure copper is larger than 0.2, the influence of the friction coefficient on the morphology of indentations and residual stress formed by ultrasonic peening of pure copper is no longer significant. With the increase of the contact stiffness between the shot and the pure copper, the indentation size, the depth of the compressive residual stress field, the maximum compressive residual stress and the surface tensile residual stress induced by ultrasonic shot peening of pure copper increase accordingly. The research results have important guiding significance for the numerical modeling of ultrasonic shot peening.

Key words:  finite element model of ultrasonic shot peening; residual stress; indentation profile; shot velocity; indentation morphology; numerical simulation; contact stiffness
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