Abstract: Based on a HPC platform, the impact process of discrete media is numerically simulated, and the variation law of particle’s coefficient of restitution (CORs) with impact velocity, particle size distribution is studied. It is found that for a given impact velocity, regardless of monodispersed or multi-dispersed particles, with the increasing of chain’s length, the COR of the particles gradually reached stable, which is only related to the impact velocity and the size ratio of the impacted particles, and the impulse of the compression stage is a stable value which does not vary with chain’s length. At that condition, the COR after the impact between the incident particle and the chain decreases with the increasing of the impact velocity, but it is much larger than the COR of the impact with an infinite half-space solid wall. For the multi-dispersed chain’s COR, its distribution is in the form of a typical Gaussian distribution, and the distributions are related to the impact velocities and the size ratio of the impacted particle.

Key words: high performance computing(HPC), coefficient of restitution, elastoplastic impact, multi-body dynamic