Surface Temperature Measurements in Rolling and Sliding EHD Contacts

Abstract

A number of devices in which concentrated contact conditions occur have relatively small amounts of slip or none at all. A knowledge of contact temperatures developed under these conditions is essential to understanding the lubricant rheology and also the fluid film failure. In this study, moving surface temperature measurements in rolling and sliding EHD point contacts were made using an available infrared technique. Film thickness and traction have also been measured. Slide-to-roll ratios of −2 to +2 have been studied. By using a different kinematic configuration, stationary surface temperatures have also been measured. It has been shown that, while surface temperature rises in the low slip region are relatively small, stationary surface temperatures are significantly higher than the moving surface temperatures. Flash temperature theory has been extended to cover the combined rolling and sliding conditions. Correlation between the predicted and the measured values has also been performed. Presented at t...