关键词: 残余压应力, 弹丸束喷丸模型, 喷丸, 喷丸强度

Abstract: Shot peening is a surface treatment process to significantly improve fatigue resistance of the peened part, which is widely used in aerospace, automotive, power machinery and other important areas. Shot peening numerical simulation is the main theoretical tool for designing shot peening process and evaluating the fatigue resistance after shot peening. At present, single shot and array shot model are the main numerical models in which the shots’ impact locations are defined beforehand, and the random property of the projectile position in the practical shot peening process is ignored. A shot stream finite element model with multiple randomly distributed shots is developed with ABAQUS python program. The relationships between the shot peening parameters and the compressive residual stress are obtained by the proposed model, the influence of the process parameters on the roughnesss of the peened part is discussed, and the Almen intensity saturation curve is calculated. The Q235 steel shot peening experiment is carried out to validate the finite element model. The proposed model in this study provides theoretical reference for the sophisticated control of shot peening. Roughness of the peened part with respect to the peening parameters is obtained. The study provide scientific and theoretical basis for the shot peened process accurate control.

Key words: Almen intensity, Compressive residual stress, Shot peening, Shot stream model