Abstract
Wear studies of material combinations, sliding or rolling in contact, frequently produce very inconsistent results. Thin film effects are often cited as the cause of these disparities. One means of detecting the presence of these films is by the use of electrical contact measurements to determine the degree of metal-to-metal contact. This paper describes an experimental study of the wear behavior of grease-lubricated, cast bronze sleeve bearings running against steel, shafts at high loads, to 24.8 megapascals and a low sliding velocity of 1.6 m/min. The effects of the casting method, shaft speed and shaft finish were investigated. Bearing torques, temperatures, contact resistances, and wear rates were monitored, during the tests. Neither the torque nor the temperature measurements could be related consistently to the wear data. On the other hand, the electrical contact resistance measurements correlated very well. Changes in wear rates were accompanied by corresponding changes in contact resistance. A reg...
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