An advanced model of dynamic contact and sliding friction of elastomers at rough, self-affine interfaces is presented. It describes the frictional force via the dissipated energy, resulting from sliding stochastic excitations of the rubber by surface asperities on various length scales. The effect of surface roughness is considered by three surface descriptors: the fractal dimension and two cut-off lengths, which are obtained from a fractal analysis of the surface via stylus- or laser measurements. The hysteresis response of the rubber enters through viscoelastic master curves of the complex modulus up to high frequencies. Based on this concept stationary friction curves are estimated numerically over a broad velocity scale depending upon surface roughness and temperature. They are compared to experimental friction data found for filled elastomer systems. The obtained results provide a deeper insight into the role of adhesion forces under different contact conditions, e. g. by applying various lubricants. The investigations are found to be useful for a better understanding of the traction behavior of tires on dry and wet roads during ABS-braking of passenger cars.
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- Mechanical Modelling of Friction and Adhesion of Elastomers at Rough Interfaces
A. Le Gal
- Springer Netherlands
in-adhesives, MKVS, Zühlke/© Zühlke, Nordson/© Nordson, ViscoTec/© ViscoTec, Hellmich GmbH/© Hellmich GmbH