To study the effect of dual peening

the periodic 3D finite element model of 34CrNiMo6 shot peening with a number of random projectiles is established using finite element analysis software ABAQUS. At first

the proposed periodic model is verified by experiment. Then the strengthening effect of shot peening and the influence of Almen intensity on residual stress field are analyzed with the proposed periodic model. The results show that the residual stress on surface layer of 34CrNiMo6 caused by dual shot peening is larger than that caused by single shot peening

and the residual stress distribution on surface is more uniform

but the depth of maximum residual stress is the same. Dual shot peening can attain less surface roughness.