Friction Coefficient of Different Material Pairs Under Different Normal Loads and Sliding Velocities

摘要

In the present study, friction coefficients of different material pairs are investigated and compared. Using a pin on disc apparatus, friction coefficients of copper-copper, copper-brass, brass-brass, brass-copper pairs are investigated experimentally. Experiments are carried out when different types of pin slide on different disc materials under normal load 10, 15 and 20 N and sliding velocity 1, 2 and 3 m/s. Variations of friction coefficient with the duration of rubbing at different normal loads and sliding velocities are investigated. Results show that friction coefficient varies with duration of rubbing, normal load and sliding velocity. In general, friction coefficient increases for a certain duration of rubbing and after that it remains constant for the rest of the experimental time. Moreover, the obtained results reveal that friction coefficient decreases with the increase in normal load for all the tested pairs. On the other hand, it is also found that friction coefficient increases with the increase in sliding velocity for all the material pairs. The magnitudes of friction coefficient are different for different material pairs depending on sliding velocity and normal load.