Physics – Condensed Matter – Materials Science
Scientific paper
2007-08-10
Physics
Condensed Matter
Materials Science
11 pages, 2 figures
Scientific paper
10.1103/PhysRevE.78.051304
The coefficient of normal restitution of colliding viscoelastic spheres is computed as a function of the material properties and the impact velocity. From simple arguments it becomes clear that in a collision of purely repulsively interacting particles, the particles loose contact slightly before the distance of the centers of the spheres reaches the sum of the radii, that is, the particles recover their shape only after they lose contact with their collision partner. This effect was neglected in earlier calculations which leads erroneously to attractive forces and, thus, to an underestimation of the coefficient of restitution. As a result we find a novel dependence of the coefficient of restitution on the impact rate.
Poeschel Thorsten
Schwager Thomas
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