The temperatures on the rubbing surfaces were calculated (just before seizure) for the row tests of different mineral oils (without EP additives), which were carried out by different authors on several testing machines (four-ball machines, crossed-cylinder machine and disk machine) with different sliding speeds. These temperatures for certain oil-metal combinations, evaluated by means of the theoretical formulas (developed by Blok and Jaeger) practically coincide with the values of the critical temperatures of the same oils, obtained by the author directly from experiments with KT-2 four-ball machine (very low)—sliding speed, high contact load, and external heating of the oil and specimens). The influence of the plastic deformation at the area of contact on the value of the critical temperatures for some oil-metal combinations is shown.

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