Results 171 to 180 of about 1,643 (214)
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Scuffing resistance of phosphate esters
Wear, 1978Abstract Scuffing tests with phosphate esters were conducted under very severe conditions of lubrication using a reconstructed Timken tester. Aryl phosphates were more effective as extreme pressure agents than alkyl phosphates. The difference in scuffing resistance between aryl and alkyl phosphates is attributed to the difference in the surface films
Y. Yamamoto, F. Hirano
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Running-In and the Enhancement of Scuffing Resistance
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 1992Twin-disc tests in microelastohydrodynamic lubrication (micro-EHL) confirm that prior running-in at lower sliding speed enhances load and temperature at scuffing. Examination of surface oxidation and smoothing gives a new insight into the running-in process and suggests that the latter is the dominant effect.
D A Kelly +3 more
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Method for scuffing propagation assessment
Tribotest, 2001AbstractThis paper describes a method for the determination of scuffing propagation using a four‐ball extreme‐pressure tester. The method has been developed at the authors' laboratory and is a completely new approach to the investigation of scuffing phenomena.
W. Piekoszezuski +2 more
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Scuffing as Influenced by Oxygen and Moisture
A S L E Transactions, 1970The effect of air on scuffing has been studied with a four-ball tester and ball-on-cylinder device. Water vapor is as effective as oxygen in preventing scuffing with lubricated systems, and even more effective in unlubricated sliding. On the other hand, under certain conditions, the combination of oxygen and moisture gives a type of scuffing caused by ...
I. B. Goldman +2 more
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Effect of abrasive contaminants on scuffing
Tribology International, 1985Abstract Four-ball machine tests have been performed to study the effect on scuffing of fine silica abrasive particles contained in the lubricant. The boundary lubrication zone that sets in after seizure recovery has been utilized in the study. The particles are found to increase abrasive wear but reduce adhesive wear and to cause scuffing at less ...
S. Chandrasekaran +2 more
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Effect of Superfinishing on Scuffing Resistance
Volume 4: 9th International Power Transmission and Gearing Conference, Parts A and B, 2003A fundamental understanding of gear scuffing has been promoted for a number of years by the use of twin disc scuffing rigs. Quantities of interest such as friction and bulk temperature are more easily and less expensively measured than performing actual gear testing. This paper discusses the scuffing test data performed on specimens superfinished using
Lane W. Winkelmann +3 more
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The mechanism of scuffing in diesel engines
Tribology, 1970Abstract A simple pin-and-disc wear machine has been used to produce the W 2 white layer which is found on cast iron rings and liners from “scuffed” i.c. engines. The results indicate that scuffing of cast iron only occurs when a smear of oil is present; with copious oil or “dry” conditions other types of wear occur.
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Frictional Response of Ceramics in Scuffing
2008Scuffing, described as a sudden catastrophic failure of sliding surfaces under severe; contact conditions, is usually indicated by a sudden rise in friction, contact temperature and noise. In metals, scuffing occurs by a severe plastic deformation process. In the present study.
C. Lorenzo-Martin +3 more
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SCUFFING AND WEAR OF VALVE GEAR
Scientific Lubrication, 1955REPORTS FROM THE U.S.A. recently have referred quite frequently to scuffing and wear of valve gear, and it would therefore seem that this trouble has been more prevalent of late than it used to be. This may be due to increased engine loading, the use of additive-containing lubricating oils, or changes in engine design. A recent paper (to the SAE Golden
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Probability of Scuffing in Lubricated Contacts
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 1989An analytical determination of the probability of scuffing is presented and used to modify and extend a computer program that was the subject of earlier work. The program identifies conditions that produce boundary or mixed lubrication with asperity overlaps for which the plasticity index is greater than 0.6.
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