The surface integrity of shot-peened aluminum was numerically studied. A new finite element model of shot peening was developed

in which the indentations produced by multiple shot impacts are distributed uniformly on a circle within the shot-peened surface. The shot peening coverage was calculated by creating a circular path. Under the different shot peening coverage

the circular path-distributed surface morphology

roughness

residual stress

work hardening and grain refinement were investigated. The results show that

with the increase of shot peening coverage

the surface roughness

residual compressive stress

work hardening degree and grain-refinement degree increase

but the increments gradually decrease and present the saturate tendency after exceeding the full coverage

which are in accord with the evolution of surface equivalent plastic strain induced by multiple shot impacts.