By Terence F. J. Quinn
This unified method of the research of wear and tear in mechanical structures concentrates at the tools of actual research and the functions of those strategies. this can be then illustrated via a dialogue of particular tribosystems. the 1st a part of the ebook offers an intensive advent to actual research that prepares the reader to appreciate next dialogue of purposes. even if the outline of structures isn't really exhaustive, the remedy and the speculation is common and may consequently be proper to person case reviews. Tribologists from a large choice of disciplines in addition to researchers in physics, chemistry, metallurgy and mechanical engineering will take advantage of this article
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Additional info for Physical analysis for tribology
Example text
Hence (Ap) and (Qp) are, respectively, the tribological Arrhenius constant and the activation energy for parabolic oxidation. 35) are the density of oxide in the plateaux (po), the mass fraction of oxide which is oxygen (/o), the speed of sliding V, the gas constant R and the distance of a sliding contact between two asperities d. (iii) The growth of oxide films in tribo-systems This topic is basic to oxidational wear and has been the subject of several papers. Yoshimoto and Tsukizoe (1957) assumed that an oxide film grows and is removed between each asperity contact, which then becomes the source of wear debris.
35 contacts/mm2 for (N/An). The terms which depend on either Ts or Tc have been indicated by the parenthesis adjoining each term. 38) with the Arrhenius constant for parabolic oxidation (Ap) replacing A, the activation energy for parabolic oxidation (Qp) replacing g, and the oxidation temperature (T) assumed to be either (Tc) or (7^) according to whether the term relates to 'in contact' or 'out of contact' oxidation. 35b) with (W/pm) replacing (ATeal) and kp replacing Apexp(-Q/RTo)l (viii) Oxidational wear in which the growth law is not parabolic We have seen that, although there is a wealth of evidence pointing to parabolic tribo-oxidation, there is also some support for the possibility that tribo-oxidation might occur linearly with respect to time.
Note that at A, the lubricant film thickness must have been virtually reduced to zero, so that the load between the shaft and the bearing is being carried entirely on asperity contacts. In the zone to the left of A, the coefficient of friction is almost independent of load, viscosity and shaft speed. 4 Solid lubrication There is another form of lubrication which is difficult to classify, namely 'solid lubrication'. This involves fairly thick films of lubricant in the form of lamellar solids such as molybdenite, graphite, etc.