Solid friction: how the onset of sliding is governed by fracture mechanics
Elsa Bayart (Laboratoire de Physique)
| Quand ? |
Le 06/11/2017, de 11:00 à 12:00 |
|---|---|
| Où ? | Amphi. schrödinger |
| Participants |
Elsa Bayart |
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What happens at the interface between two solid bodies in contact at the transition from stick to slip? This problem has important implications to various fields such as engineering, where the challenge is to control friction, or earthquake dynamics, where prediction of earthquakes occurrence and magnitude is crucial.
A frictional interface is composed of an ensemble of discrete contacts that resist to shear. High speed measurements of the real contact area and stress fields near the interface reveal that motion is only initiated when these contacts are broken via the propagation of an interfacial rupture. In this talk, we will show that these ruptures are true shear crack as they propagate and as they stop. We then use the framework provided by fracture mechanics to probe the interfacial properties under dry and lubricated conditions and to understand the rupture dynamics of heterogeneous interfaces. Our results demonstrate the extensive applicability of dynamic brittle fracture theory to friction.