...Mingyu Zhang; Xinqing Wang; Yiming Han; Jing Wang; C. H. Venner Intermittent motion is a complex process that involves constant speed, deceleration, static stages, and acceleration. Theoretical analysis suggests that shortening the period of intermittent motion can increase the film thickness...

... 2024 Graphical Abstract Figure smart lubricants soft-EHL core traction film thickness rheology The characteristics of a lubricated interface are notably influenced by the viscosity of the lubricant and its response to variations in shear rate, temperature, and pressure...

... lubrication. Here, it is necessary to precisely determine operating conditions and lubricant properties such as rheology whose contribution to film thickness formation may be influenced by attributes of individual lubrication regimes. The high-pressure viscosimeter and the optical tribometer were used...

...Alberto Porras-Vazquez; David Philippon; Nicolas Fillot; Philippe Vergne; Nicolas Devaux; Lionel Lafarge; Guillermo E. Morales-Espejel In the present work, we evaluate the effects of lubricant starvation on the film thickness of spinning large-size point contacts from an experimental standpoint...

... experimentally investigated using a four-ball wear test machine. The results indicated that the vibration velocity tends to increase with the sliding velocity. With a lower combination of ratio of the vibration velocity to the sliding velocity and the specific film thickness, lower friction coefficients were...

...J. C. Atwal; R. K. Pandey This paper presents the performance behaviors (coefficient of friction, minimum film thickness, and pressure distributions) of a fluid film thrust bearing using a newly conceived micro-texture on pads. In the numerical investigation, the Reynolds equation has been...

...Quentin Allen; Bart Raeymaekers Polyethylene wear debris limits the longevity of prosthetic hip implants. We design a pattern of axisymmetric texture features to increase hydrodynamic pressure and lubricant film thickness and, thus, reduce solid-on-solid contact, friction, and wear in hard-on-soft...

...Quentin Allen; Bart Raeymaekers We design a pattern of microtexture features to increase hydrodynamic pressure and lubricant film thickness in a hard-on-soft bearing. We use a soft elastohydrodynamic lubrication model to evaluate the effect of microtexture design parameters and bearing operating...

...), calcium carbonate (CaCO 3 ), and alumina ( α -Al 2 O 3 ) in bare grease (BG). The formulated nanocomposite greases are tested for film formation, frictional and vibrational response under a limited supply of greases. The use of transparent glass disk better analyses the profile of film thickness...

...M. Masjedi; M. M. Khonsari Three formulas are derived for predicting the central and the minimum film thickness as well as the asperity load ratio in line-contact EHL with provision for surface roughness. These expressions are based on the simultaneous solution to the modified Reynolds equation...

...H. Dormois; N. Fillot; W. Habchi; G. Dalmaz; P. Vergne; G. E. Morales-Espejel; E. Ioannides This paper presents a study of the spinning influence on film thickness and friction in EHL circular contacts under isothermal and fully flooded conditions. Pressure and film thickness profiles are computed...

...Ilya I. Kudish; P. Kumar; M. M. Khonsari; Scott Bair The estimation or prediction of elastohydrodynamic lubrication (EHL) film thickness requires knowledge of the lubricant properties. Today, in many instances, the lubricant properties have been obtained from a measurement of the central film...

... stress are calculated, and lubricant film thickness is obtained using the load-sharing concept of Johnson et al. (1972, “A Simple Theory of Asperity Contact in Elastohydrodynamic Lubrication,” Wear, 19, pp. 91–108) To validate the analysis, the predicted film thickness and the friction coefficient...

... polymer additives are often added to the base oil. This paper investigates the effect of mixture rheology on elastohydrodynamic lubrication (EHL) film thickness using EHL contact measurements and a full numerical analysis for three synthetic lubricants including two single-component lubricants PAO650...

... about film thickness changes within a lubricated contact. The behavior of microdents has been observed for positive slide-to-roll ratios when the disk is moving faster than the microtextured ball. The depth of microdents has been found to play significant role as to the lubrication films efficiency...

...I. C. Faraon; D. J. Schipper This paper discusses a mixed lubrication model in order to predict the Stribeck curve for starved lubricated line contacts. This model is based on a combination of the contact model of Greenwood and Williamson and the elastohydrodynamic (EHL) film thickness for starved...

...Scott Bair; Yuchuan Liu; Q. Jane Wang There has been a long-standing need for a piezoviscous parameter α film that, together with the ambient viscosity μ 0 , will completely quantify the Newtonian rheology so that the film thickness for liquids that do not shear-thin in the inlet may be calculated...

... 2000 hydrodynamics mechanical contact lubrication surface topography elasticity tribology viscosity Elastohydrodynamic Lubrication Film Thickness Nonsteady State Transient Stop–Start Grubin Part I of this study measured the film collapse in lubricated elastohydrodynamic...

... in lubricant film thickness and shape during fast, controlled deceleration, both in pure sliding and pure rolling conditions. Film collapse is seen to occur in two stages. The first persists throughout the deceleration period and, during this stage the film geometry remains almost constant across the contact...