Extreme-Pressure Lubrication and Wear. The Influence of Contact Stress on Metallic Wear

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Abstract
The wear of a steel pin terminating in a truncated 120° cone rubbing on the flat surface of a rotating disk was studied in relation to the initial contact stress. With white oil as the lubricant, three ranges of initial contact stress were employed: 152,000–157,000 psi, 67,000–76,000 psi and 47,000 psi. Typical time-dependent wear curves for the two higher pressure ranges were multistage in character, showing first a sharp rise in the amount of wear, then a levelling-off and finally a transition to rapid wear again. At 47,000 psi initial contact stress, wear was a linear function of time. A compounded extreme-pressure lubricant was studied at 250,000 psi and at 148,000–156,000 psi initial contact stress. The time-dependent course of wear in these cases showed only two stages: the initial sharp rise and the levelling-off. The significance of the early phases of an experiment on metallic wear with respect to the mechanism of extreme-pressure lubrication is discussed.

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