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In this study, the coefficients of friction on the rubber surfaces having abrasion patterns which were abraded by abrasive cloth were examined. When a mating glass specimen was perpendicularly rubbed against parallel ridges of abrasion patterns, the effects of sliding direction and the spacing of the abrasion patterns on the coefficients of friction were investigated. From the experiments, the variations of the coefficients of friction were explained by the variation of contact area.The coefficients of friction on the abrasion patterns were examined with same direction of abrasion by abrasive cloth and the counter direction of abrasion. The coefficients of friction on the abrasion patterns in a direction of abrasion were from twenty-five to fifty percents larger than those rubbed in a counter direction of abrasion. When the abrasion patterns were rubbed in a direction of abrasion, the coefficients of friction increased because of the increment of apparent applied load by friction force. While the abrasion patterns were rubbed in the counter direction of abrasion, the coefficients of friction decreased by the decrement of apparent applied load by friction force. The coefficients of friction decreased when the spacing of abrasion patterns and applied load increased. The load dependence was dominant as the spacing of patterns was large.

The Friction on the Rubber Surface having Abrasion Patterns. Effect of Sliding Direction on the Coefficients of Friction.