Independent friction-restitution modeling of two-disk collisions

The oblique collisions between two axisymmetric disks moving on a flat horizontal surface are described in terms of impact modeling based the assumption that normal and tangential restitution mechanisms operate independently friction. Describing these usual Coulomb formulation, model allows for an interpretation some “anomalous” experimental data reported literature. These data, corresponding to variation coefficients friction with angle, remained unexplained classic formulations, understood within framework independent friction-restitution closure. Experimental metallic coins agreement including rolling effects.