An experimental study of initial scuffing and recovery in sliding wear using a four-ball machine

Odi-Owei, S.; Roylance, B. J.; Xie, Liyang

doi:10.1016/0043-1648(87)90149-9

Cited by 34 publications

(16 citation statements)

References 14 publications

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“…Other workers also attributed the occurrence of scuffing in a fourball machine to the desorption temperature of the lubricant [48]. Contact temperatures in the range 240~ consistent with other findings [7,49], were predicted for various combinations of load and speed greater than 1000 rpm. However, there were some problems associated with a constant-desorptiontemperature model proposed for boundary and mixed lubrication regimes.…”

Section: Desorption Modelssupporting

confidence: 60%

“…Large quantities of spherical wear particles were also found in the failed cams and tappets, but the significance of this type of wear was not discussed. Spherical particles, however, were found in four-ball tests and were attributed to a thermalchemical reaction between the ball material and the lubricant [49]. 1 Fig.…”

Section: Asperity Interaction Modelsmentioning

confidence: 99%

“…Failure occurs when a combination of the above variables lies above this surface. The critical failure triplet in combination with running time t has also been quoted as the failure expression: F~176 0"03 T [49].…”

Section: Empirical Formulamentioning

confidence: 99%

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A review of scuffing models

Bowman

Stachowiak

1996

Tribol Lett

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The mechanism of wear known as scuffing has been a research topic of great interest for many years. However, the question of how scuffing is initiated and the factors that contribute to its occurrence are still poorly understood. In general, it can be said that scuffing manifests itself as the sudden failure of lubricating films in mechanical equipment operating under extreme conditions of load and/or speed. Components such as cams, tappets, gears and piston rings are all prone to scuffing failure. Understanding the mechanisms that initiate failure would enable the development of criteria for scuffing prediction. This paper reviews the numerous scuffing models and theories that exist today and, in doing so, defines the important factors involved in scuffing initiation. Emphasis is given to existing theoretical scuffing models which have been correlated by a wealth of research data obtained from experimental test rigs.

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Section: Desorption Modelssupporting

confidence: 60%

Section: Asperity Interaction Modelsmentioning

confidence: 99%

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A review of scuffing models

Bowman

Stachowiak

1996

Tribol Lett

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“…Thus, it is much more important to predict and detect the onset of scuffing than to examine the well-scuffed wear features. Although there is ample literature describing the progression of scuffing, much less attention has been paid to prediction and monitoring of scuffing (Tasbaz,et al (18); Morris,et al (19); Cutiongco and Chung (20); Enthoven and Spikes (21); Odi-Owei, et al (22)). R.J.K.…”

Section: Introductionmentioning

confidence: 97%

The Development of a “Pin-on-Twin” Scuffing Test to Evaluate Materials for Heavy-Duty Diesel Fuel Injectors

Truhan

Blau

et al. 2007

Tribology Transactions

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In order to meet stricter emissions requirements, advanced heavy-duty diesel fuel injection systems will be required to operate at higher pressures and temperatures and in fuels that have poorer lubricity. Scuffing, as a mode of failure, severely limits injector life, and new materials and processes are required to resist scuffing in these more stringent operating conditions. Consequently, there is a need to test the ability of candidate fuel system materials to resist scuffing in fuel-lubricated environments. This paper describes a pin-on-twin reciprocating wear test in which a cylindrical specimen slides, under load, across two fixed, parallel cylindrical specimens that are perpendicular to the axis of the upper sliding specimen. Cylinders of annealed AISI 52100 were tested dry and lubricated by Jet A fuel and on-highway #2 diesel fuel. The friction force was found to give a reliable real-time determination of the onset of scuffing as verified by the morphology of the wear scar. The scar width and surface roughness profiles either did not reliably detect the onset or were difficult to carry out with this geometry.

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“…Although there is ample literature describing the progression of scuffing [4][5][6], much less attention has been paid to prediction and monitoring the onset of scuffing. Infrared and visual monitoring [7], and contact temperature and friction coefficient tracking [8] were used to study the initial scuffing. These tests used a progressive loading procedure, which has inherent difficulties due to the accumulation of prior damage from each load increment.…”

Section: Introductionmentioning

confidence: 99%