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Assessment of lubricated contacts: Mechanisms of scuffing and scoringScoring and scuffing are defined as two distinct but related forms of failure of hardened ferrous components lubricated by liquids. Experimental observations of these phenomena are described, and criteria for scoring and scuffing are discussed. The mechanisms proposed by various authors to explain these observations are enumerated. The view presented here is that, under conditions yet to be defined, scoring is a gradual breakdown of the lubrication of interacting asperities, such lubrication being boundary or microelastohydrodynamic in nature, or a mixture of the two. The final scuffing stage represents a breakdown of the main elastohydrodynamic system, but this may be triggered by the deterioration in surface topography as a result of scoring. An extension of published theoretical treatment of elastohydrodynamic breakdown is proposed, and a critical experiment to assess the importance of edge effects in band contacts is suggested. The practical implications of the proposed mechanism are reviewed, and recommendations for further work are made. A possible thermal instability mechanism for the breakdown of boundary lubrication is outlined.
Document ID
19830011847
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Dyson, A. (Wychwood Birkenhead Merseyside, United Kingdom)
Wedeven, L. D. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
September 4, 2013
Publication Date
February 1, 1983
Subject Category
Mechanical Engineering
Report/Patent Number
NAS 1.15:83074
NASA-TM-83074
E-1478
Accession Number
83N20118
Funding Number(s)
PROJECT: RTOP 505-32-1B
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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