冷喷涂中球形和椭球粒子对撞击过程影响的对比研究

In this work, Finite Element Analysis (FEA) method and ALE grid method are adopted to simulate Al alloy particle deposition behavior on Mg alloy (AZ31B) substrate by cold spray. The deformation behavior and temperature variation of the particle and substrate, and the effect of the particle shape on particle rebound performance et. al are compared when ellipsoidal particle and spherical particle impact on substrate. Results reveal that effect of particle shape on the local deformation of particle symmetrical section and the substrate in impact process is great. This is shown in the plastic deformation and temperature on perpendicular cross sections non-symmetry distribution.It is found that effects of the initial shape and particle velocity on the rate of the particle rebound kinetic energy to the particle initial kinetic energy, the crater depth of substrate and the maximum relative contact area between particle and substrate are obvious.However, effect of particle flat degree on the crater depth is small. There is no obviours change of crater depths under impaction of spherical or ellipsoidal particles.