Right-angle impaction and rebound of particles

Abstract

When a particle impacts on a surface, its kinetic energy is partitioned into energy lost in plastic deformation and energy stored in elastic deformation. Previous theoretical models have recognized that the plastically deformed layer hardens to an elastic stress limit that may significantly exceed the one of the original material. A new model has been developed for right-angle impaction that considers secondary elastic deformation in the plastically deformed layer. Calculations have shown that at high impact velocities about 50% of the impact kinetic energy may be stored in this secondary elastic deformation and more than 40% may be lost in plastic deformation. This secondary deformation energy is, thus, the principal energy component affecting particle rebound over a wide range of impact velocities. Comparisons of calculations with experimental data show reasonable agreement. The ratio of total adhesive energy of impact kinetic energy was found to depend on particle size and target material which results in the dependence of rebound velocity on the same parameters.