Inverted stick-slip friction

Sliding of adhesive boundary lubricated surfaces immersed in aqueous soluti ons has been studied. Under certain conditions inverted stick-slip motion i s observed where, in contrast to conventional stick-slip, the friction spik es point down rather than up and the transition from smooth to stick-slip s liding occurs above rather than below some critical driving velocity. For t he rst time, inverted stick-slip motion has been studied in detail and theo retically analyzed in terms of a general model based on the kinetics of for mation and rupture of adhesive links ( bonds) between two shearing surfaces .