Sealing is at the Origin of Rubber Slipping on Wet Roads

Details Sealing is at the Origin of Rubber Slipping on Wet Roads Sealing is at the Origin of Rubber Slipping on Wet Roads

2004-12-02

arxiv.org/abs/cond-mat/0412045v1

Nature Materials, Vol. 3, p. 882-885 (2004)

Physics

Condensed Matter

Materials Science

5 pages, 4 figures. Published on Nature Materials (November 7th 2004)

Scientific paper

10.1038/nmat1255

Loss of braking power and rubber skidding on a wet road is still an open physics problem, since neither the hydrodynamical effects nor the loss of surface adhesion that are sometimes blamed really manage to explain the 20-30% observed loss of low speed tire-road friction. Here we advance a novel mechanism based on sealing of water-filled substrate pools by the rubber. The sealed-in water effectively smoothens the substrate, thus reducing the viscoelastic dissipation in bulk rubber induced by surface asperities, well established as a major friction contribution. Starting with the measured spectrum of asperities one can calculate the water-smoothened spectrum and from that the predicted friction reduction, which is of the right magnitude. The theory is directly supported by fresh tire-asphalt friction data.

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