Finite Element Analysis And Experiment Study On Shot Peening Of 34CrNiMo6 Steel

Shot peening is one of the commonly used surface treatment methods,widely used in automotive,aerospace,oil and other industries.After the shot peening,the residual compressive stress layer can be formed on the surface,the surface dislocation density will be improved,the grain refinement,fatigue strength and fatigue life will be improved obviously.In this paper,the difference of residual stress,surface roughness and remnant austenite content of 34CrNiMo6 steel is compared with that of single shot peening with the combination of FEM simulation and shot peening test.The shot peening strength The influence of final residual stress field is analyzed systematically,and the simulation model of real workpiece shape is discussed.In this paper,a periodic finite element model of shot peening is proposed,which can represent the surface of a large area target by a small representative element,and simulate a large number of projectiles incident on the workpiece surface.The parametric modeling of shot peening was realized by ABAQUS / Python script.The correctness of the simulation results of the periodic model is verified by shot peening test.The composite shot peening and single shot peening were compared with the residual stress field distribution,the surface roughness after shot peening and the change of retained austenite content.The effects of the composite shot peening have the advantages of shot peening.And the strengthening process of the target is studied by simulation method.The effect of the second shot peening on the final shot peening effect was studied by using finite element simulation.It is concluded that the final maximum compressive stress increases and then decreases with the increase of the shot peening strength in the second step,and the depth of the residual stress is almost inconvenient,The residual stress layer thickness increases.And the same parameters of shot peening test,the same conclusion.In addition,the feasibility of establishing the target model with real workpiece shape in finite element simulation is explored by using reverse engineering technology.