State, rate and temperature-dependent sliding friction of elastomers

Details State, rate and temperature-dependent sliding friction of elastomers State, rate and temperature-dependent sliding friction of elastomers

2000-05-31

arxiv.org/abs/cond-mat/0005531v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

We present an experimental investigation of the non stationary frictional properties of multicontact interfaces between rough elastomers and rough hard glass at low velocities (<= 200 mu m s^{-1}). These systems, for which the deformation contribution to friction is negligible, are shown to exhibit a phenomenology which is similar to what is observed for non elastomeric materials in the same multi-contact configuration, and which are quantitatively described by the state- and rate-dependent friction laws. This permits to identify clearly the two contributions to adhesive friction which are mixed in steady sliding: the interfacial shear stress which appears as thermally activated formation and breaking of molecular bonds, and the real area of contact which evolves through viscoelastic creep of the load bearing asperities.

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