Influence of contact aging on nanoparticle friction kinetics.
One of the oldest concepts in tribology is stick-slip dynamics, where a disruptive sequence of stick and slip phases determine the overall resistance in sliding friction. While the mechanical energy dissipates in the sudden slip phase, the stick phase has been shown to be characterized by contact strengthening mechanisms, also termed contact aging. We present experiments of sliding nanoparticles, where friction is measured as a function of sliding velocity and interface temperature. The resulting complex interdependence is in good agreement with Monte Carlo simulations, in which the energy barrier for contact breaking increases logarithmically with time, at a rate governed by thermal activation.
Institut für Angewandte Physik, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 15, 35392 Giessen, Germany.
Michael
M
Feldmann
Institut für Angewandte Physik, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 15, 35392 Giessen, Germany.
Dirk
D
Dietzel
Center for Nanotechnology (CeNTech), Heisenbergstraße 11, 48149 Münster, Germany; Institute of Physics, University of Münster (WWU), Wilhelm Klemm-Strasse 10, 48149 Münster, Germany; and Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
Harald
H
Fuchs
Institut für Angewandte Physik, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 15, 35392 Giessen, Germany.
André
A
Schirmeisen