Abstract
Similarity of internal and external friction: Soft matter frictional instabilities obey mean field dissipation through slip avalanches
Highlights
Friction between two solid materials that are slowly being moved past each other can proceed in an intermittent fashion, with sudden slips or slip avalanches, separated by quiet times without any slipping activity
We show that the stick-slip behaviors of the friction between a hydrogel surface and a glass probe satisfy universal power laws and scaling functions predicted by a simple mean field theory for slip avalanches inside solid materials [6]
The drastically compressed material prevents the interface from slipping and converts it to one that responds in an unstable way to lateral force buildup
Summary
Friction between two solid materials that are slowly being moved past each other can proceed in an intermittent fashion, with sudden slips or slip avalanches, separated by quiet times without any slipping activity. We compare the statistics and the dynamics of these slip events with the predictions of a simple mean field model that describes slips inside solid materials. For example, the slips typically occur exceedingly quickly, making it challenging to measure them experimentally. If they occur inside the solid, the buried interface often forces the measurement to be located far from the active regions and the resolution of time and force are not captured [3]
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