Dynamic Friction Measurements on Belts of Viscoelastic Materials

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Abstract
The frictional behavior of belts of viscoelastic materials slipping on metal rollers has been investigated as a function of the amount of slip. The results show that the exponent in the relation Ff/A = a(Fn/A)x, relating frictional force per unit area to normal pressure, was greater than unity at low values of slip. This may be due to a height distribution of microscopic asperities on the surfaces. The value of the exponent generally decreased as the slip increased. This can be explained by assuming that the deformational response of the viscoelastic material becomes more elastic as the slip is increased. A corresponding increase in the proportionality constant can be accounted for if the shear strength of these materials increased at a faster rate than the stress‐strain proportionality constant as the slip was increased.

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