SCUFFING WEAR OF THE TRIBOLOGICAL PAIRS UNDER OSCILLATORY MOTION

Tribologia ◽  
2016 ◽  
Vol 269 (5) ◽  
pp. 31-40 ◽  
Author(s):  
Stanisław GUZOWSKI ◽  
Grzegorz ZAJĄC ◽  
Grzegorz KACZOR
Keyword(s):  
High Probability ◽  
Adhesive Wear ◽  
Oscillatory Motion ◽  
Test Machine ◽  
Line Contact ◽  
Wear Process

The surfaces of the friction pairs in oscillatory motion are exposed to the complex wear processes. Scuffing is a specific wear process, which comprises abrasive and adhesive wear. This paper presents the results of the preliminary scuffing tests, conducted on the T-05 test machine under oscillatory motion in the line contact. The results obtained from the tests confirmed the high probability of the scuffing occurrence under the assumed tests conditions. This is the basis for the planning of further research in this area.

An adhesive wear model for helical gears in line-contact mixed elastohydrodynamic lubrication

Wear ◽  
2019 ◽  
Vol 426-427 ◽  
pp. 896-909 ◽  
Author(s):  
Hongbing Wang ◽  
Changjiang Zhou ◽  
Yuying Lei ◽  
Zhongming Liu
Keyword(s):  
Adhesive Wear ◽  
Elastohydrodynamic Lubrication ◽  
Line Contact ◽  
Wear Model ◽  
Helical Gears

Tribological Studies of Ion-Implanted Steel Constituents Using an Oscillating Pin-on-Disk Wear Tester

1990 ◽  
Vol 112 (1) ◽  
pp. 27-34 ◽  
Author(s):  
R. Wei ◽  
P. J. Wilbur ◽  
W. S. Sampath ◽  
D. L. Williamson ◽  
Yi Qu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Elevated Temperatures ◽  
Adhesive Wear ◽  
Wear Testing ◽  
304 Stainless Steel ◽  
Test Machine ◽  
Aisi 304 ◽  
High Doses ◽  
Pin On Disk ◽  
Wear Tests

Wear tests of ferrite (pure α-Fe) and austenite (AISI 304 stainless steel) implanted with nitrogen have been conducted using a unique oscillating pin-on-disk test machine. The results show that nitrogen implantation at elevated temperatures to high doses dramatically improves the adhesive wear resistance of ferrite and the critical load at which the wear mechanism changes from mild to severe adhesive wear for austenite. The wear resistance of nitrogen implanted ferrite is determined by the nitride formed. Ranked from most to least wear resistant the nitrides observed are γ’-Fe4N, ε-Fe3N, and ζ-Fe2N. No evidence of nitride break-up and attendant nitrogen migration during wear testing is found. Nitrogen does diffuse into both ferrite and austenite rapidly when they are implanted at an elevated temperature and this enhances their wear resistances.

Tribological Properties of Mo/NiCrBSi Thermal Spray Deposits

1998 ◽  
Author(s):  
V. Fervel ◽  
B. Normand ◽  
C. Coddet ◽  
M. Delaet
Keyword(s):  
Cast Iron ◽  
Adhesive Wear ◽  
Tribological Behavior ◽  
Optical Microscope ◽  
Atmospheric Plasma ◽  
Wear Process ◽  
Dry Conditions ◽  
Nicrbsi Coating ◽  
The Difference ◽  
Nicrbsi Coatings

Abstract The tribological behavior of Mo/NiCrBSi coatings obtained by atmospheric plasma spray was studied under dry conditions using an Amsler machine. Discussion is made on the effects of the plasma gas mixture and of the preheating of the substrate. The wear process of Mo/NiCrBSi in situation of dry rolling-sliding contact versus cast iron was observed using a profilometer, an optical microscope, and a scanning electron microscope. It was found that the wear mechanism could be divided into two steps : the first one corresponds to an abrasive wear; it results from the difference in hardness between the counter-specimen and the Mo/NiCrBSi coating. The second one corresponds to an adhesive wear resulting from the transfer of cast iron from the counter-specimen to the coating.

scholarly journals A FRACTURE-INDUCED ADHESIVE WEAR CRITERION AND ITS APPLICATION TO THE SIMULATION OF WEAR PROCESS OF THE POINT CONTACTS UNDER MIXED LUBRICATION CONDITION

2021 ◽  
Vol 19 (1) ◽  
pp. 023
Author(s):  
Hui Cao ◽  
Yu Tian ◽  
Yonggang Meng
Keyword(s):  
Adhesive Wear ◽  
Wear Particle ◽  
Rolling Motion ◽  
Morphology Evolution ◽  
Point Contacts ◽  
Wear Process ◽  
Subsurface Layers ◽  
Lubrication Condition ◽  
Simulation Results ◽  
Almost All

Adhesive wear is one of the four major wear mechanisms and very common in almost all macro-, micro- or nanotribosystems. In an adhesive wear process, tiny material fragments are pulled off from one sliding surface and adhered onto the counterpart. Later these fragments form loose particles or transfer between the contact surfaces. Because of the topographical and physicochemical property non-uniformity of engineering surfaces, adhesive wear happens heterogeneously on the loaded sliding surfaces, and it is also discontinuous during sliding or rolling motion owing to the damage accumulation and fracture occurred inside the subsurface layers. Taking account of these characteristics, a novel fracture-induced adhesive wear criterion has been proposed in this study in order to predict local wear of material in sliding. Moreover, the proposed wear criterion is applied to predicting wear particle formation and morphology evolution of mixed lubricated rough surfaces during reciprocating sliding, and the simulation results are compared with the ball-on-disk experimental measurements.

Elastohydrodynamic Lubrication of Rough Surfaces Under Oscillatory Line Contact With Non-Newtonian Lubricant

2007 ◽  
Author(s):  
Mongkol Mongkolwongrojn ◽  
Khanittha Wongseedakaew ◽  
Francis E. Kennedy
Keyword(s):  
Surface Roughness ◽  
Film Thickness ◽  
Power Law ◽  
Reynolds Equation ◽  
Initial Conditions ◽  
Rough Surfaces ◽  
Elastohydrodynamic Lubrication ◽  
Oscillatory Motion ◽  
Line Contact ◽  
Minimum Film Thickness

This paper presents the analysis of elastohydrodynamic lubrication (EHL) of two parallel cylinders in line contact with non-Newtonian fluids under oscillatory motion. The effects of transverse harmonic surface roughness are also investigated in the numerical simulation. The time-dependent Reynolds equation uses a power law model for viscosity. The simultaneous system of modified Reynolds equation and elasticity equation with initial conditions was solved using multi-grid multi-level method with full approximation technique. Film thickness and pressure profiles were determined for smooth and rough surfaces in the oscillatory EHL conjunctions, and the film thickness predictions were verified experimentally. For an increase in the applied load on the cylinders, the minimum film thickness calculated numerically becomes smaller. The predicted film thickness is slightly higher than the film thickness obtained experimentally, owing to cavitation that occurred in the experiments. For both hard and soft EHL contacts, the minimum film thickness under oscillatory motion is very thin near the trailing edge of the contact, especially for stiffer surfaces. The surface roughness and power law index of the non-Newtonian lubricant both have significant effects on the film thickness and pressure profile between the cylinders under oscillatory motion.

scholarly journals Friction and adhesive wear behavior caused by periodic impact in mixed-lubricated point contacts

2020 ◽  
Vol 12 (2) ◽  
pp. 168781402090166
Author(s):  
Xin Pei ◽  
Wei Pu ◽  
Jialong Yang ◽  
Ying Zhang
Keyword(s):  
Friction Coefficient ◽  
Adhesive Wear ◽  
Wear Behavior ◽  
Critical Role ◽  
Surface Velocity ◽  
Asperity Contact ◽  
Impact Action ◽  
Wear Process ◽  
Lubrication Condition ◽  
Functional Components

Periodic impact is a common phenomenon experienced by functional components. The mechanisms governing the adhesive wear growth caused by the periodic impact are not well understood, which limits the development of antiwear and lubricating behavior. In this work, the periodic impact action caused by rubbing surface velocity and contact load is studied in the sliding wear process under mixed lubrication condition. At each wear simulation circle, the material removal at each asperity contact location is evaluated and the surface topography is renewed correspondingly. The evolutions of friction and wear track are revealed during wear process. We find that the friction coefficient changes periodically caused by the periodic speed, and the wear rate increases almost linearly with either speed period or speed amplitude. The load impact results in an abrupt variation in friction coefficient, while it appears to be limited in adhesive wear state compared to speed, highlighting the critical role of velocity impact in wear formation.

scholarly journals THE PROCESS OF FORMATION OF THE ADHESIVE CAVITIES UNDER OSCILLATORY MOTION

Tribologia ◽  
2018 ◽  
Vol 279 (3) ◽  
pp. 59-67
Author(s):  
Grzegorz KACZOR
Keyword(s):  
Adhesive Wear ◽  
Optical Microscope ◽  
Oscillatory Motion ◽  
Future Research ◽  
Surface Geometry ◽  
Research Plan ◽  
The Impact ◽  
Worn Surface ◽  
Further Development ◽  
Wear Tests

During the direct contact of metal-to-metal, complex tribological wear processes occur. One of the most important and the most problematic phenomena leading to irreversible changes in the geometric structure of the surface is adhesion as a result of a local welding of the asperity peaks. It causes local damage to the surface of the cooperating components in the form of the adhesive cavities. The paper presents the results of the wear tests, the purpose of which was to determine the impact of the surface geometry structure on the process of the adhesive wear and the formation of the adhesive cavities under oscillatory motion. The tests were carried out on the T-05 tribotester based on the previously established research plan. The geometrical surface structure was measured in the area of wear and the photographs of the adhesive cavities were made on an optical microscope. The captured images of a worn surface correspond to the images of the cavities presented in the literature. The obtained research results are the basis for the further development of a future research plan in a similar scope.

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