Investigation on Theoretical Analysis of Residual Stress Distribution Induced by Shot Peening in 2397 Aluminum-Lithium Alloy

摘要

In order to investigate the effect of shot peening (SP) on residual stress distribution, an amendatory theoretical model considering the effects of friction between shots and treated component has been proposed based on Hertz contact theory. The residual stress field induced by shot peening in 2397 Aluminum-Lithium alloy was considered as an example. To verify the theory, the residual stresses field along the depth in 2397 Aluminum-Lithium alloy was measured by means of X-ray diffraction method, accompanied by layer removal technique. The distributions of residual stresses derived from experimental results were in good accordance with theoretical model, while the minor errors still existed among them. The slight errors are mainly ascribed to surface roughness, ideal elastoplastic constitutive model and crystallographic textures. As a result, the theoretical model and corresponding algorithm can be applied to predict residual stresses fields under various shot peening conditions for Aluminum-Lithium alloys and other metallic materials, as well.