Prediction of shot peen forming through direct finite element simulation

Author:  H.Y. Miao, A. Gariépy, A. Levers and M. Lévesque
Source:  Conf Proc 2014: ICSP-12 Goslar, Germany (pgs.336-341)
Doc ID:  2014099
Year of Publication:  2014
Abstract:  
Shot peen forming has been widely used in the aerospace industry to shape complex contours of large and relatively thin parts. It is a derivative of the shot peening process that consists of balancing the non-equilibrated induced stresses caused by shot peening. Most of the current studies of peen forming deal with one step of this balancing process which is called conventional peen forming. In this paper, the Finite Element (FE) methodology developed at LM², which can account for initial residual stresses (due to the lamination of plates for example), was applied to two specific cases. The first is the stress peen forming where the samples were pre-bent under four different conditions. The simulated results are very consistent with the experimental results and show that with the increase of the pre-bending moment, the resulting deflection increases following the pre-bending direction. The second application is the peen forming simulation of a full-scale wing panel considering several forming processes such as Saturation peening, Chordwise peening and Spanwise peening. The current model runs in less than 10 minutes on a PC. The simulated results reproduce the tendencies experimentally observed on a real full-scale panel.