Abstract
Frustrated total internal reflection has been used to measure the real areas of contact between flat belts and V-belts running on transparent pulleys. Changes in contact with pressure and in active arc extent with torque have been seen and used with measurements of belt tensions and surface roughness to study the adhesive sliding friction of belts. The ratio of surface shear strength to Young's modulus of the contacts has been found to be about 0.1, as in fundamental studies of rubber friction. Belt construction, either the woven fabric substrate or embossing of flat belts or the fibre reinforcement of raw-edge V-belts, has also been shown to influence the friction coefficient.
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