Abstract

We present an experiment and a simple model of a granular projectile on a granular medium. Experiment consists in impacting an half space of PVC beads with a single bead. Numerous beads are then ejected around the impact point. The loci of ejection and velocities of the ejecta were measured. The experimental data were compared with the predictions of a simple discrete model. In this model, the energy is transferred from grain to grain on a frozen disordered medium following the law of binary collisions. This theoretical description is in remarkable agreement with the experimental observations. Besides, the present model provides a clear picture of the mechanism of energy propagation.

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