Abstract
An infrared microdetector was employed to measure surface temperatures in elastohydrodynamic contacts with Hertz pressures up to 2 GPa, sliding velocities up to 6.0 m s −1 and rolling velocities up to 1.25 m s −1 with slide/roll ratios from −2 to +2. Different surface roughnesses were also employed. The lambda ratio (mean film thickness to composite surface roughness) was varied from 20 to considerably less than 1. The surfaces employed were AISI 52100 steel against Al 2O 3 and the lubricant was a typical naphthenic hydrocarbon. High maximum surface temperatures have been observed (to 300 °C). Analysis of the data shows very good correlation with the Blok flash temperature theory for simple sliding (∑ = ± 2). An extension of this theory to include two moving surfaces at unequal temperatures predicts the ball surface temperature quite accurately.
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