Yurata, T. G., Dimitri; Piumsomboon, Pornpote; Chalermsinsuwan, Benjapon. "The importance of parameter-dependent coefficient of restitution in discrete element method simulations," Advanced Powder Technology Vol. 32, No. 4, 2021, pp. 1004-1012. https://doi.org/10.1016/j.apt.2021.02.005. (https://www.sciencedirect.com/science/article/pii/S0921883121000698)
Abstract: The coefficient of restitution (COR) is an important constant that represents the energy dissipation during contact between two objects. Simulation using the conventional discrete element method (DEM) involves a constant COR. This study presents a DEM simulation method that uses a parameter-dependent COR. The parameter-dependent COR was obtained from a collision incident between spherical particles and a plate surface using a drop-test apparatus. Glass and polypropylene beads of 3–6-mm diameter were used while acrylic and steel were used as the plate surfaces. The particle trajectories were captured by a high-speed camera and analyzed by an image analyzer. The COR was then correlated to a parameter-dependent COR function that depends on the material, impact velocity, and temperature. Free-fall DEM simulations using a constant COR and parameter-dependent COR were compared. The parameter-dependent COR approach obtained better agreement with experimental results than the constant-COR approach. The proposed concept could be applied for other material combinations with a wide range of operating conditions to obtain a database of parameter-dependent COR values for the simulation of solid handling applications.
Keywords: Discrete element method; Coefficient of restitution; Parameter-dependent coefficient of restitution; Drop test; Collision