Impact energy loss from particle surface roughness in particulate systems

A majority of mechanics models have been developed to reveal the interaction between two particles in particulate systems under the assumption that particle surfaces are smooth. In this letter, the surface-roughness-induced impact friction model, incorporated with the rolling friction model, was established to study the particle-particle interaction in the particulate system. The results indicate that energy dissipation was caused in part by the impact energy loss in the particulate system with the particle stiffness more than 10 GPa and particle diameter on the order of millimeter magnitude. This letter gives an insight into the assumption that the impact energy loss from particle surface roughness should not be neglected, at least, in some particulate systems.