PREDICTION OF PLASTIC-DEFORMATION AND RESIDUAL-STRESSES INDUCED IN METALLIC PARTS BY SHOT PEENING

A model has been developed by Guechichi et at. and improved by Khabou et nl. to predict residual stresses and plastic deformation induced by shot peening in metallic parts. The major controlling factors were ta ken into account. The effect of the tangential friction between the sh ot and the treated material, the shot hardness to material hardness ra tio and the angle of impingement were not taken into account. This pap er presents an ex-tension of this model by taking into account the eff ect of friction, the angle of impingement, and the hardness ratio. The material is characterised by using the model of Khabou et al. as exte nded by Hamdane in the case of triaxial loading. Application on a plat e made of Udimet 720 shows a good agreement with the residual stresses obtained by X-ray diffraction analysis. Calculations made using diffe rent coefficients of friction and angles of impingement show a good co rrelation with the experimental data available in the literature. MST/ 3489.