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Apparent and true friction coefficients in viscoelastic polymers

Lafaye S., Gauthier C., Schirrer R.

International Journal of Applied Mechanics and Engineering

2002

Vol. 7, no 3

847-857

During scratching of a viscoelastic surface with a rigid tip, the geometry of the contact changes with the sliding speed and temperature. The apparent friction is the ratio of the tangential load, which is necessary to generate the relative motion, to the applied normal load. An apparent friction model is presented here and used to analyse the experimental friction coefficient of a polymer and the effects of the asymmetry of the contact area. The true friction might also depend on the sliding speed (contact time) and temperature.