Experimental Study And Finite Element Simulation Of Water-jet Cavitation Peening316Stainless Steel

Water-jet cavitation peening (WCP) was a cold working process that can impactcompressive residual stresses in the surface and subsurface layers for improvement thefatigue life of mechanical parts. In those processes, high-velocity water with abundantair bubbles continuously impinges over the surface. These bubbles’ blasts produce highpeak loads that can cause localized plastic deformation on the layers of the surface.Upon unloading, the elastically stressed on the sub surface layers tend to recover tooriginal state. But the continuity of material in both elastic and plastic zones does notpermit this to happen. Consequently, a compressive residual stress was trapped in thetreated component.In this paper, water-jet cavitation was carried out on316stainless steel, andANSYS/LS-DYNA software was applied for simulate the residual stresses based onwater-jet cavitation peening experiment. Then the results of experimental andsimulation was analyzed, the main conclusions was as follows:(1)Analysised of the macro-morphology of the sample under different water-jetcavitation peening parameters, there were no obvious macroscopic plastic deformationon the surface of samples, and there were a lot of dispersed pits on the impact affectedzone. The plastic plastic deformation distribution along the grain boundaries in fringeareas of the impact zone when water-jet cavitation parameters was T=10min, P=40MPa, S=30mm, and there were more significant plastic deformation on the impact zoneand it was difficult to distinguish the grain boundary, and the microstructure loss wasmore serious.(2)ANSYS/LS-DYNA software was applied in non-linear elastic-plastic dynamicfinite element simulation based on the water-jet cavitation experiments.100%Dampingsettings was more come to a totally real and effective to applied to reflect of thepropagation of impact wave and variation of von.mises effective stress. Amplitude ofthe residual stresses along the z axis and the depth of maximum residual stress wereincrease as the increase in the number of the impact wave when the impact pressurewas under certain conditions. The result show that the numerical simulation agrees wellwith the experimental results of maginical and distribution of residual stress determinedby X-ray when the parameter of water-jet cavitation peening was T=10min, P=40MPa,S=30mm.