To investigate the influence of ultrasonic shot peening process parameters on the residual stress field and surface coverage of TC4 alloy,a coupled discrete element method and finite element method(DEM-FEM)3D simulation model was developed using com-mercial software.The study focused on the effects of process parameters(amplitude and shot diameter)on the residual stress field of TC4 alloy.Surface coverage of the workpiece was evaluated using two methods:node PEEQ method and image analysis,to study the influence of amplitude on surface coverage.Results indicated that with the increase of amplitude and shot diameter,characteristic parameters of the residual stress field increase.Surface residual compressive stress and maximum residual compressive stress amplitude reached-691.83 MPa and-1047.97 MPa respectively,with a residual stress depth up to 0.61 mm.As the amplitude increases,surface coverage gradually increases by approximately 5%.Compared with the node PEEQ and image analysis method,the coupled DEM-FEM simulation method can quickly obtain surface coverage following ultrasonic shot peening.
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