CRC Handbook of Lubrication: Theory and Practice of by Robert W. Bruce

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By Robert W. Bruce

This guide covers the overall region of lubrication and tribology in all its elements: friction, put on lubricants (liquid, stable, and gas), greases, lubrication ideas, purposes to numerous mechanisms, layout rules of units incorporating lubrication, upkeep, lubrication scheduling, and standardized assessments; in addition to environmental difficulties and conservation. the data contained in those volumes will relief in attaining powerful lubrication for regulate of friction and put on, and is one other step to enhance knowing of the complicated components taken with tribology. either metric and English devices are supplied all through either volumes

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Extra resources for CRC Handbook of Lubrication: Theory and Practice of Tribology, Volume II: Theory and Design

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When the surfaces slide, lubricant is dragged into the contact region and separates the surfaces. This will initially lower the coefficient of friction, but at a still higher sliding speed there is a viscous drag which again causes an increase in coefficient of friction as shown in Figure 9. This McKee-Petroff curve is typical for a shaft rotated in a sleeve bearing. The abscissa Copyright © 1983 CRC Press LLC Volume II 43 is given in units of ZN′/P where Z is the viscosity of the lubricant, N′ is the shaft rotating speed, and P is the load transferred radially from the shaft to the bearing.

The methods used include electrical resistance, heat transfer, total internal reflectance of an optical element pressed against a metal surface, phase contrast microscopy, ultrasonic transmission, election emission phenomena, computer simulation, large-scale surface model studies, and analytical methods based on the mechanics of solids. Most methods are unsatisfactory in that either the observations are not made in real time, or the method is incapable of distinguishing between many small points of contact vs.

If the coefficient of friction remains constant after sliding begins, the weight W will advance at the same speed as the prime mover. If on the other hand, the coefficient of friction decreases after sliding begins, less force will be required to sustain sliding than the spring force. Weight W will, therefore, accelerate, shortening the spring, and finally overshooting the equilibrium position. The spring then exerts a force less than that required to sustain sliding so the weight decelerates and may even stop.

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