Frictional Response of Lubricant in EHL Contact under Transient Bi-directional Shear Loading
Journal Title: Tribology in Industry - Year 2017, Vol 39, Issue 4
Abstract
Consideration of performance, efficiency and energy consumption is nowadays an inherent part of the design of every modern machine. These factors are mainly determined by mechanisms taking place within the lubricated contacts. Unfortunately, the physical origins of these mechanisms have been investigated exclusively for steady conditions that do not occur in actual contacts of machines affected by vibrations. This study presents novel experimental data describing friction in the elastohydrodynamically lubricated contact exposed to the main steady sliding motion along with lateral sliding micro-oscillations. Friction forces were measured simultaneously in two perpendicular directions of point contact. It is shown that the lubricant response in the main direction of motion suffers from shear thinning and thermal effects whereas its lateral response is isothermal Newtonian. Moreover, the lateral friction affects the friction in the main direction, but not vice versa, when the majority of shear flow is maintained in this main direction. These finding are attributed to the perturbation of structural arrangement of lubricant. The results also suggest that a response of mineral oils to shearing is anisotropic. A limiting shear stress is discussed since the total friction was not able to exceed a certain value.
Authors and Affiliations
J. Fryza, P. Sperka, I. Krupka, M. Hartl
Keywords
Related Articles
- EP ID EP245867
- DOI 10.24874/ti.2017.39.04.10
- Views 87
- Downloads 0
Experimental Study of Ageing Behaviour of Al-Cu-Mg/Bagasse Ash Particulate Composites
The experimental correlation of ageing behaviour for Al-Cu-Mg/Bagasse ash particulate composites with 2-10wt% bagasse ash particles produced by double stir-casting method has been investigated. Hardness values measuremen...
The Temperature Distribution in Friction Clutch Disc under Successive Engagements
The repeated engagements were made by the friction clutch in the realistic applications to reach the desirable speed. The traditional theoretical method to compute the temperature field specifically the maximum temperatu...
Corrosion Behavior of Compocasted ZA27/SiCp Composites in Sodium Chloride Solution
The corrosion behavior of particulate ZA27/SiCp composites in an aerated sodium chloride solution was studied. The composites were synthesized via compocasting with addition of 1, 3 and 5 wt.% SiC particles in the matrix...
Nanoindentation of Za-27 Alloy Based Nanocomposites Reinforced with Al2O3 Particles
Nanoindentation has been widely used for material mechanical characterization. In this study, nanocompozite of ZA-27 alloy matrix reinforced with different volume fractions of nanometric Al2O3 ceramic particles ranging f...
Corrosion Behavior of the As-cast and Heat-treated ZA27 Alloy
Corrosion behaviour of the as-cast and heat-treated ZA27 alloy was examined. The alloy was prepared by conventional melting and casting route and then thermally processed by applying T4 heat treatment regime (solutionizi...