Numerical research on stress peen forming with prestressed regular model

摘要

Stress peen forming is widely used in aerospace industry to form the thin components with complex geometry. In the stress peen forming, the prestressing condition is a critical factor that need to be precisely controlled. In this study, the effects of the prestress on the peening deformations are investigated by using static and dynamic simulations. A regularly parked four-shot model is used to study the interactions of adjacent shot treatments. To verify the finite element model with precisely controlled parameters, regularly indenting tests are adopted. The analytical results reveal that the tensile prestress enhances the shot dimple and the plastic region sizes. The contributions of the prestress to the induced bending moments and stretching forces are indicated with two scale factors. Comparison of the single-shot model and regular parked four-shot model shows the peening effects can be equivalent within certain averaging regions. The static and dynamic simulations are compared on dimple sizes and forming effects. Finally, the indenting and peening tests are carried out to verify the analytical results. (C) 2015 Elsevier B.V. All rights reserved.