14th International Conference on Shot Peening

Shot peen forming pattern optimization to achieve cylindrical and saddle target shapes: the inverse problem

H.Y. Miao, F. P. Gosselin, M. Lévesque

Département de Génie Mécanique, École Polytechnique de Montréal, C.P. 6079, Succ. Centre-ville,Montréal, Québec, H3C 3A7 Canada

Introduction

The inverse problem of determining how to shot peen a plate such that it deforms into the desired target shape is a challenge in the peen forming industry. While peening thick plates uniformly on one side results in a spherical shape, with the same curvature in all directions, complex peening patterns are required to form other shapes, such as cylinders and saddles found on fuselages and wing skin panels. In this study, we present an optimization procedure to automatically compute shot peening patterns.

Objectives

This paper aims to demonstrate the beneficial effects of advanced surface treatment technologies the cemented steel E16NCD13 in terms of surface roughness, compressive residual stresses and microhardness. The surface integrity modifications produced by vibratory peening were compared to shot peening at similar Almen intensities.