The Effects of Relative Humidity on Static Friction Coefficient of Several Frictional Pairs
相对湿度对几种摩擦副静摩擦系数的影响

The effect of relative humidity on the static friction coefficients of four frictional pairs, namely, metal metal, metal graphite, metal TiN coating, and metal TiN coating pairs, was examined on a friction and wear tester made in our laboratory. It has been found that the relative humidity has no influence on the static friction coefficients of metal graphite and metal WC coating pairs, but has influence on those of metal metal and metal TiN coating pairs. The fractal contact model was used to calculate the additional static friction coefficient caused by water film meniscus. As the results, the calculated additional static friction coefficients conform well to the tested ones, but the calculated values are slightly larger than the tested ones.