An Analysis of Some Factors that Influence Wet Skid Resistance
An analysis is given which is expected to serve as the basis for the calculation of the skid resistance of tires on wet roads. The analysis is for a single sphere, sliding and rolling on water covered rubber. The sphere is taken to be a single scaled up protruberance in the road surface texture. Ignoring interaction effects each protruberance is seen to contribute to a total drag force on a sliding tire.
The analysis uses equations of elastohydrodynamics modified to accommodate the viscoelastic properties of rubber. The properties of the rubber are obtained from an identation test. The analysis correlates well with experiments using water on rubber except at low sliding speed. Experiments using fluids that wet rubber better than water does show good correlation over the entire sliding speed of the experiments. The conclusion is then reached that the skid resistance of tires at low speeds is strongly influenced by the poor wettability of water to rubber.
KeywordsViscous Drag Fluid Film Tire Rubber Contact Pressure Distribution Rubber Chemistry
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