Fine particle shot peening has the advantages of producing compressive residual stress, microscale work hardening near the surface, and minimal surface roughness. Therefore, fine particle shot peening has been applied to numerous parts to improve fatigue strength. In this study, the shot velocity of fine zircon and stainless steel shots at four values of air pressures were precisely measured using particle image velocimetry. The shots were accelerated to a standoff distance of approximately 80 mm from the nozzle outlet. The shot velocity of the zircon shots is faster than that of the stainless steel shots. The measured shot velocity for both shots is almost proportional to the 0.5th power of the air pressure. To investigate the effect of the measured shot velocity on the residual stress distribution in an aluminum alloy (A5052) plate, a finite element model was developed for fine particle shot peening. The analyzed residual stress distributions using the accurately measured shot velocity agreed well with those measured in four test pieces using the zircon and stainless steel shots at two air pressures. The shot velocity measurement method and numerical analysis model for residual stress were both validated.

细粒喷丸硬化的优点是产生压缩残余应力，表面附近的微观加工硬化以及最小的表面粗糙度。因此，将细粒喷丸处理应用于许多部件以改善疲劳强度。在这项研究中，使用粒子图像测速仪精确测量了四个气压下的锆石和不锈钢细粒的射速。喷丸被加速到距喷嘴出口约80 mm的隔离距离。锆石枪的射速比不锈钢枪快。两次射击的实测射击速度几乎与气压的0.5次方成正比。要研究测量的喷丸速度对铝合金（A5052）板中残余应力分布的影响，开发了用于细粒喷丸的有限元模型。使用精确测量的抛丸速度分析的残余应力分布与在两个气压下使用锆石和不锈钢抛丸在四个试件中测得的残余应力分布非常吻合。验证了弹丸速度测量方法和残余应力数值分析模型。