Get ASM Handbook: Volume 18: Friction, Lubrication, and Wear PDF

By ASM, American Society for Metals

ISBN-10: 0871703807

ISBN-13: 9780871703804

This guide is a accomplished advisor to easy innovations, equipment of laboratory trying out and research, fabrics choice, and box prognosis of friction, lubrication, and put on difficulties. Emphasis is put on useful info to supply engineers with the instruments had to comprehend the tribological habit of fabrics and clear up difficulties at the activity.

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Extra info for ASM Handbook: Volume 18: Friction, Lubrication, and Wear Technology

Example text

Woodruff School of Mechanical Engineering, at the Georgia Institute of Technology, for the sponsorship of this work. Frictional Heating Nomenclature In applying the developments associated with frictional heating, concepts have emerged that can dramatically affect the integrity of an analysis. The user needs to understand how such parameters as temperature, T; coefficient of friction, ; heat partition factor, ; heat source time, t; Péclet number, Pe; and real area of contact, Ar, are interpreted and how they contribute to the heat transfer model employed.

For a stationary body (case 1), subjected to a uniform circular heat source of radius a, Holm (Ref 10) reports that the average flash temperature (in °C) is: (Eq 25) where Q1 represents the rate of heat supplied to body 1 of thermal conductivity k1. For a component (case 2), moving with velocity V2 past the uniform circular heat source, the average exposure time will be (a · )/(4 · V2) (Ref 11). Applying this parameter to Eq 8, the average flash temperature (in °C) is: (Eq 26) where Q2 represents the rate of heat supplied to body 2 of thermal conductivity k2 and diffusivity D2.

Péclet Number. The Péclet number, Pe, is a dimensionless heat transfer grouping defined by Pe = cpVLc/k (Eq 4) where is the density; cp is the specific heat at constant pressure; V is the velocity; Lc is a characteristic length; and k is the thermal conductivity (Ref 2). It relates the thermal energy transported by the movement or convection of the medium, to the thermal energy conducted away from the region where the frictional energy is being dissipated. In computing the Péclet number, Lc is usually expressed as a measure of the contact dimension in the direction of sliding motion.

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