Author(s)

M. Barquins & J.C. Charmet

Abstract

It is well-known that molecular attraction forces, of the van der Waals type for rubber-like materials, act in the contact area between a polished and cleaned rigid spherical indenter and the smooth and flat surface of a rubber sample; they increase the equilibrium size of this contact area compared to the value which can be deduced from the classical theory of elasticity. It be shown that these forces are responsible for the existence of a kinetics of detachment in a pull-off test. In this study, we demonstrate that these long range attractive forces also alter drastically the rebound of a rigid ball on a rubber surface. It is shown that during the movement of the indenter out of

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