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The performance of friction material in an oil-cooled environment is greatly influenced by conditions of use. Power, speed, oil flow, and inertia are some of the factors whose effects on material performance have been documented in the literature. These factors interact in a complex manner which makes it difficult to predict material performance. The effects of several major factors-power, speed, inertia, oil flow, and reaction plate thickness-were investigated using an inertia dynamometer. The program was designed to assess the relative significance of each factor in determining material performance and to examine how effects of each factor are modified by interaction with other factors. Three materials were tested. Groove pattern was investigated as a means of modifying the effects of other factors.

The effects of ten commercial oil additives on the static and dynamic coefficients of friction of graphitic paper and elastomeric friction materials have been investigated. Additives which function as a friction modifier, detergent, extreme pressure agent, antioxidant, viscosity index improver, or dispersant were included in the study. Using stepwise addition of the additives to the base oil in the dynamometer, the changes in static and dynamic coefficients of friction attributable to the additive were determined for a porous, graphitic paper type product and a more dense, But resilient, elastomeric friction material. Interactions of the additives in determining the frictional properties of these materials were also investigated.