Construction Of Shot Peening Process Parameter-Surface Characteristic Function Of Aluminum Alloy

7XXX series Al-based alloy is a kind of high-strength structural alloy.In order to improve the fatigue performance and stress corrosion resistance,Al-based alloy materials are often shot peened.Study the influence law of shot peening processes on the surface characteristics of Al-basd alloy materials and realizing precise shot peening technique can effectively improve the performance and service life of Al-based alloy components.In this paper,7075-T651 Al-based alloy is used as the research material.A 3D multiple shot peening model was established by ANSYS/LS-DYNA finite element simulation software.The effect of shot peening on the surface characteristics of the material was explored,and a relevant function models were constructed.The main research contents are as follows:1.Using ANSYS/LS-DYNA finite element software,combined with the experimental field environment,a 3D multiple shot peening finite element model was constructed,and the target material model was divided to refine the grid of impact area,which can efficiently and economically explore the effect of shot peening on the surface characteristics of the Al-based alloy material.2.With the optimized simulation model,more detatiled and accurate residual stress and surface roughness data were obtained,which revealed the change rules of the surface roughness and residual stress field of the material after shot peening,and then the simulation results were verified by experiments.3.First,the experimental scheme was designed by the Box-Behnken method,and then the calibrated shot peening finite element model was used to accurately obtain the material surface stress distribution and crater deformation under different process parameters combinations.Finally,combined with analysis of variance and response surface analysis(RSM)to verify the results.A process parameter-surface characteristic function models was established.The function models can provide a prediction design of shot peening process parameters for cross combination of stress and deformation,which can applied to shot peening of Al-based alloy.