Shot velocity measurement using particle image velocimetry and a numerical analysis of the residual stress in fine particle shot peening
Shot velocity measurement using particle image velocimetry and a numerical analysis of the residual stress in fine particle shot peening
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DOI：
10.1016/j.jmapro.2020.08.059
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发表时间：
2020-10-01
影响因子：
6.2
通讯作者：
Ma, Ninshu
中科院分区：
文献类型：
--
作者：
Ohta, Takahiro;Ma, Ninshu
细颗粒喷丸具有产生压缩残余应力、近表面微尺度加工硬化和最小表面粗糙度的优点。因此，细颗粒喷丸已被应用于许多零件，以提高疲劳强度。利用粒子图像测速仪对锆英石和不锈钢细颗粒在四种不同气压下的弹丸速度进行了精确测量。将射料加速至距喷嘴出口约80 mm的间隔距离。锆英砂的喷丸速度比不锈钢快。两次射击的测量射击速度几乎与空气压力的0.5次方成比例。为了研究喷丸速度对铝合金（A5052）板残余应力分布的影响，建立了细颗粒喷丸强化的有限元模型。采用精确测量的弹丸速度分析的残余应力分布与在两种气压下用锆英石和不锈钢弹丸在四个试件中测量的残余应力分布吻合得很好。对喷丸速度测量方法和残余应力数值分析模型进行了验证。
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.