Dynamic impact model of plastic deformation between micro-particles and flat surfaces without adhesion

Abstract

This article considers the normal elastic-plastic impact of micro-particles against a flat surface without adhesion, and a dynamic model of plastic deformation was developed to describe the rebound behavior of impacting particles. Analytical expression for restitution coefficient was obtained and it was validated by the experimental data in the literature. The effects of material properties and impact velocities on the rebound behavior were also discussed. The relationship of normal force, particle velocity, plastic deformation, and contact duration was derived. The results show that the evolution of the normal force for the elastic-plastic impact is asymmetric, and the contact time for the elastic-plastic impact is obviously longer than the equivalent perfectly elastic impact for a given impact velocity. It is also found that the evolutions of contact time and loading time varying with impact velocities are in good agreement with the experimental observations.