NUMERICAL INVESTIGATION ON ENERGY BALANCE AND DEPOSITION BEHAVIOR DURING COLD SPRAYING

In this paper, the physical process during the impact of a cold spraying spherical particle with an infinite homogeneous substrate was simulated using the finite element method (FEM). The effects of the impact velocity, the particle and substrate materials on the impact behavior were investigated. The results show that a significant amount of the initial total kinetic energy of the particle is dissipated due to the plastic deformation of particle and substrate, finally transforming to their internal energies. An energy partition coefficient K, defined as the ratio of the energies distributed in the particle and substrate, has been introduced, which is closely related to the initial total kinetic energy of the particle and the deformability of the particle and substrate during the impact. It is found that it is difficult to make a particle with light K and a substrate with low K cohere strongly.