To study the elasto-plastic contact state and stress field distribution between the projectile and the component during the ultrasonic shot peening process, the multi-projectile impact model based on the display particle dispersion function and the Hertz-Mindlin (No Slip) collision contact mechanics law is used. A model between the impact velocity of the projectile and the coefficient of restitution is established. According to the spherical cavity expansion model, the stress field under the collision of a single projectile is calculated. Aiming at the numerical model of ultrasonic shot peening, DEM-FEM coupling numerical model and ALE adaptive mesh model is established, and the effects of constant coefficient of restitution and dynamic coefficient of restitution on the surface residual stress, residual stress layer depth, and surface macroscopic morphology of the component surface are studied through numerical simulation. The constant recovery coefficient increased in the process, the surface compressive residual stress, the depth of the compressive residual stress and surface roughness are all increased. Compared with the depth of the residual stress layer and the surface roughness, the extreme value of the surface residual stress distribution is about 12% lower than the average value of the inner and outer ends of the residual stress layer depth. The difference between the surface residual stress and the surface roughness is about 9%-15% lower. The results show that under constant and dynamic coefficient of restitution, the surface residual stress and the surface macro morphology are easier to achieve uniformity, compared with the depth of the compressive residual stress layer. And compared with the constant coefficient of restitution, the residual stress introduced by the dynamic coefficient of restitution on the surface of the component and the test results are less than 5%, and the prediction is closer to the true value.
CAI Jin
,
YAN Xue
,
LI Wei
,
MENG Qingxun
. Numerical analysis of ultrasonic shot peening based on DEM-FEM coupling[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022
, 43(4)
: 525925
-525925
.
DOI: 10.7527/S1000-6893.2021.25925
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