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Probing locally the onset of slippage at model multicontact interfaces
By Victor ROMERO (postdoc au LJP)
February 18, 2013 at 11:00AM - Salle de réunion du LJP

Abstract

Probing Locally the onset of slippage at model multi-contact interface
 
In recent years there has been a renewed interest on the transition from static to dynamic friction with the experimental observation using evanescent illumination of multi-contact interfaces by Fineberg et al. Slow rupture fronts, along with sub-Rayleigh to Rayleigh fronts were measured at the onset of sliding. In this presentation, I will report a similar phenomenology at a micro-textured elastomer-glass interface. Our model surfaces are designed with micro drilling techniques, and consist of thousands of spherical-caps of typical radii 100 µm, distributed both spatially and in height. I will first show how this unique system provides a way to measure both the local normal and shear forces at the interface. I will then analyse their dynamical frictional response when they are submitted to a tangential loading against glass plates. I will show that a stick-slip dynamics is observed which is associated to the existence of slow fronts propagating through the interface and driven by the stress landscape.