Numerical Simulation for Predicting Critical Velocity of Cold Spraying Particles
A coupled Euler-Lagrange quarter model for the impact of cold spraying single particles on matrix was established by using ABAQUS finite element software.The particle critical velocity at which titanium particles with size of 25 μm and aluminum particles with size of 30 μm impact the 7B04 aluminum alloy matrix to form mechanical occlusion and metallurgical bonding was predicted by simulation of particle and matrix shape change and equivalent plastic strain distribution,and the validity of the data was verified.The effects of particle size,initial temperature of particle and matrix on the critical velocity were studied.The results show that the predicting critical velocity of 25 μm titanium and 30 μm aluminum particles was 680,700 m·s-1 based on the simulated particle/matrix shape change and equivalent plastic strain distribution,respectively.The relative error between the predicting value and estimating value of empirical relation was less than 11％,indicating that the method was accurate.With the increase of particle size and the decrease of initial temperature of the particle and matrix,the critical velocity increased.The initial temperature of the particle had little effect on the critical velocity,but the influence of the particle size and the initial temperature of the matrix was significant.
万方数据
维普
