Simulation of Residual Stress of V-Notch Specimen Treated by Ultrasonic Rolling

In this study, an ultrasonic rolling pressure model is established based on Hertz contact theory for the special curved surface at the bottom of a V-notch of round-rod specimens. The quantitative relationship between rolling pressure and reduction is derived using differential mathematical methods. Additionally, a finite element simulation model for the residual stress of the ultrasonically rolled 18CrNiMo7-6 carburized steel V-notch is established, considering the surface gradient structure of the material after heat treatment, which is achieved through layering and assigning material parameters in ABAQUS simulation software. By applying specific system parameters, the residual stress distribution along the depth of each layer is obtained. The simulation results are compared with the ultrasonic rolling results and find them to be consistent, thereby verifying the effectiveness of the finite element model. The analytical technique developed in this study provides a means of evaluating the residual stress state of ultrasonically rolled 18CrNiMo7-6 carburized steel.