Frictional dynamics of viscoelastic solids driven on a rough surface.
We study the effect of viscoelastic dynamics on the frictional properties of a (mean-field) spring-block system pulled on a rough surface by an external drive. When the drive moves at constant velocity V, two dynamical regimes are observed: at fast driving, above a critical threshold V(c), the system slides at the drive velocity and displays a friction force with velocity weakening. Below V(c) the steady sliding becomes unstable and a stick-slip regime sets in. In the slide-hold-slide driving protocol, a peak of the friction force appears after the hold time and its amplitude increases with the hold duration. These observations are consistent with the frictional force encoded phenomenologically in the rate-and-state equations. Our model gives a microscopical basis for such macroscopic description.
The Abdus Salam International Center for Theoretical Physics, Strada Costiera 11, 34014 Trieste, Italy and Laboratoire de Physique Théorique et Modèles Statistiques (UMR CNRS 8626), Université Paris-Sud, Orsay, France.
François P
FP
Landes
Laboratoire de Physique Théorique et Modèles Statistiques (UMR CNRS 8626), Université Paris-Sud, Orsay, France.
Alberto
A
Rosso
Centro Atómico Bariloche and Instituto Balseiro (UNCu), Comisión Nacional de Energía Atómica, (8400) Bariloche, Argentina.
E A
EA
Jagla
D017276:Friction; D008962:Models, Theoretical; D055682:Viscoelastic Substances
D055682:Viscoelastic Substances