Thermal and Scuffing Behavior of Disks in Sliding-Rolling Contact

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Abstract
This paper presents the results of scuffing tests performed with carburized AISI 9310 steel disks and a MIL-L-7808G oil, at a variety of sliding and sum velocities, and with disks ground both axially and circumferentially but with the same composite surface roughness. On the basis of these results, a methodology for correlating and predicting the thermal and scuffing behavior of sliding-rolling disks is suggested. It is demonstrated that the difference between the oil-film temperature at the conjunction inlet and the oil jet temperature, as well as the difference between the disk surface temperature and the oil jet temperature, are basically related to the frictional power loss at the sliding-rolling contact. The scuffing failure results are examined and compared by three different criteria: the critical temperature, the critical frictional power, and the critical frictional power intensity. It is shown that under certain operating conditions the critical temperature and critical frictional power intensity do not provide a plausible guide for predicting scuffing. The critical frictional power criterion, on the other hand, can predict scuffing over the complete range of variables investigated. Other implications of the presented results are also discussed.

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