Simulation Analysis Of Aerospace Aluminum Alloy Arc-shaped Frame Defoemation Induced By Shot Peening And Secondary Development Of ABAQUS

Shot peening is a surface strengthening technology to significantly improve the fatigue strength of materials.The aerospace aluminum alloy arc-shaped frame will produce bending deformation after shot peening,which can't satisfy the precision manufacturing requirements of aviation structural parts.Through the optimization of shot peening process parameters,effective control and reduction of shot peening strengthening deformation of structural parts have a great significance for improving the shot peening process level and structural machining accuracy.Aiming at the problems of complicated analysis process and large analysis workload for the prediction and analysis process of shot peening of the arc-shape frame,based on the secondary development of the ABAQUS software,this paper develops a finite element program for the rapid analysis of the shot peening deformation prediction of the typical complex structure of the aviation aircraft,which increases the efficiency of prediction and analysis of shot peening deformation,and lays the foundation for the optimization of shot peening process parameters of aviation structural parts and the precise manufacturing of complex structures.Focusing on the above issues,the work carried out and the conclusions reached are as follows:(1)For the 7075-T651 aluminum alloy materials commonly used in aviation manufacturing,based on the finite element method,the shot peening process analysis models of single shot and multiple randomly distributed shots are established,and the effect of shot peening parameters on the residual stress distribution of aluminum alloy surface after shot peening is analyzed.Based on the multiple randomly distributed shots model,the residual stress database of typical common shot peening process is established.The analyzed process parameters include: projectile diameter,shot velocity,shot angle and shot coverage.The results show that the peak residual compressive stress and the depth of the residual compressive stress layer significantly increased with the increase of the velocity and the angle between the projectile incident direction and the target surface,but the depth of the peak residual compressive stress changes little;The diameter of the projectile has little effect on the residual stress value in the depth of 0 ? 0.1 mm,and has a significant effect on the distribution of residual stress below 0.1 mm thickness;With the shot peening coverage increases,the distribution of residual stress field tend to be stable.(2)Aiming at common arc-shape frames in aviation aircraft manufacturing,an analysis method for prediction of shot peening deformation of complex structures is established.On this basis,a finite element analysis program for arc-shape frame shot peening deformation prediction based on the secondary development of ABAQUS is developed.The program can realize the parameterization and automatic modeling of the prediction of the shot peening of the arc-shape frame,and satisfy the rapid prediction of the shot peening deformation of the arc-shape frame under various shot peening process parameters.The analysis program has the characteristics of good human-computer interaction interface and easy operation and use by engineering personnel,which greatly reduces the difficulty of shot peening deformation prediction of complex structures and improves the analysis efficiency,and provides an effective tool for optimizing the process parameters of arc-shape frame shot peening and precise manufacturing.(3)Based on the rapid prediction program for shot peening of arc-shaped frame,the deformation law of a certain type of arc-shaped frame under typical shot peening technology is analyzed.The simulation results show that: the arc-shaped frame under shot peening process on the inner and outer surface will shrink in the radial direction;The arc-shaped frame under shot peening process on the web will extend in the radial direction;Compared with the inner surface,the amount of deformation of the arc-shaped frame is more sensitive to the change of the air pressure on the outer surface and the web surface.(4)Aiming at the above-mentioned arc-shaped frame,the shot peening test is carried out,and the deformation of the arc-shaped frame is measured and analyzed,and compared with the finite element results,which verifies the accuracy and effectiveness of the rapid prediction procedure for shot peening of arc-shaped frame.The results show that the rapid prediction program for the shot peening deformation of the arc-shaped frame developed in this paper has a certain analysis accuracy,which can satisfy the optimization requirements of the shot peening process parameters for the accurate manufacture of arc-shaped structure frames in the project.