The Effect of Temperature in Concentrated Contact Lubrication

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Abstract
Experiments are described on the frictional behavior of a petroleum oil in the contact zone between a spherical steel roller and a cylindrical one moving in combined rolling and sliding at 23 C, 100 C, and 190 C, and at maximum Hertz contact stresses of up to 390,000 psi. The coefficient of friction is found to decrease with increasing temperature. The results are interpreted on the hypothesis that the frictional force represents the shearing of a film of essentially solidified lubricant at a shear plane of molecular dimensions.