Abstract
This paper describes an experimental measurement technique to record the sideforce required to dislodge an elastohydrodynamic lubricant film formed between a rubber pad and a rigid flat surface during normal approach. The friction force recorded is for the most part somewhat less than one-tenth of 1% of the normal load, corresponding to coefficients of friction ranging from 0.0003 to 0.00125. Because of these extremely low values of sideforce, a great deal of precision is required in isolating the friction force from components of the normal load, and the experimental apparatus is therefore relatively complex. The results indicate that for the same value of edge film thickness, the force required to dislodge an elastohydrodynamic film may be considerably less than that measured between rigid surfaces, particularly during the last stages of approach. The resistance of the approach surface to side displacement during the formation or collapse of an elastohydrodynamic film has particular relevance to the rolling behaviour of tyre tread elements on a wet road surface.
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