Surface Characteristic Function of Al Alloy after Shot Peening

The work aims to study the change rule of surface properties aluminum (Al) alloy after shot peening (SP), and obtain corresponding relationship between material characteristics SP parameters. Firstly, Finite Element Model (FEM) multi-projectile impact Al specimen was established by ANSYS/LS-DYNA (Version: Ansys15.0). Box-Benhnken design method (BBD) used 3-level 3-factor experiment with pressure. Projectile size, jet distance, residual stress, as well deformation were taken responses. stress at crater obtained according experiments. Then, Design-Expert software adopted fit values attain multiple regression quadratic equations, response methodology (RSM) applied analyse interaction various factors. degree model-fitting simultaneously identified in accordance an analysis variance function models. Finally, test carried out using 7075-T651 specimen. Combined X-ray diffraction (XRD) optical microscopic observation section, value could be determined verify accuracy model. adjusted R2 model 94.85% 95.08%, respectively. deviation calculated experimental less than 5.5%. section showed that deformed layer approximately same calculation value. result indicated had high accuracy. suggested quickly precisely deduce parameter combination from or material, which provided a diversity reference for hardness strengthening SP.