Effect of Sliding Velocity and Relative Humidity on Friction Coefficient of Brass Sliding against Different Steel Counterfaces

摘要

The present paper investigates friction coefficient of brass sliding against different steel counterfaces. The effects of sliding velocity and relative humidity on friction coefficient of brass are investigated experimentally. To do so, a pin-on-disc apparatus was designed and fabricated. Experiments are carried out when different types of steel pin such as mild steel (MS) and stainless steel 304 (SS 304) slide on brass disc under sliding velocity ranging from 20 to 100 cm/sec and relative humidity 60% and 80%. During experiment, normal load was kept constant at 10 N. In general, friction coefficient increases for a certain duration of rubbing and after that it remains constant for the rest of the experimental time. Results show that friction coefficient decreases with the increase in sliding velocity and relative humidity. It is found that the magnitudes of friction coefficient are different for different mating pairs. It is also observed that at 60% relative humidity, the magnitudes of friction coefficient of brass-SS pair are higher than that of brass-MS pair. On the other hand, at 80% relative humidity, there is a little difference in the values of friction coefficient of brass-SS and brass- MS pairs