Central film thickness formula for shear thinning lubricants in EHL point contacts under pure rolling

Katyal, Puneet; Kumar, Parveen

doi:10.1016/j.triboint.2011.11.007

Cited by 24 publications

(20 citation statements)

References 32 publications

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“…Формально режим трения в диапазоне контактных давлений P 2 …P 3 может быть назван граничным или переходным режимом. Трение в режиме граничной смазки исследовано в большом количестве работ [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]. В большинстве случаев граничная смазка рассматривается применительно к контактам поршневых колец с гильзой цилиндра.…”

Section: Discussionunclassified

Anti-wear additives influence upon hydrodynamic friction mode parameters in bearings of internal-combustion engines

Задорожная¹,

Zadorozhnaya²,

Mukhortov³

et al. 2016

Bulletin of Bryansk State Technical University

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An essential condition to ensure an engine life having 300,000 – 1 000,000 km according to race consists in assurance of a minimum wear rate of crankshaft bearings. For such units as connectingrod bearings a maximum allowable value of bearing brass wear makes 100 mkm which corresponds to an integral linear wear intensity of 10-14 …10-13 that is possible only at a hydrodynamic mode of friction actually at all modes of engines operations. Ensuring liquid friction in all range of contact pressures is achieved both through design methods, and technological ones. To the latter belongs first of all the application of lubricants with high wearresistant properties. In this connection arises a problem to reveal a mechanism and degree of the effect of lubricant components upon a range of contact pressure where liquid friction is realized. This paper reports the experimental evidences of the increase of contact pressures at which is achieved a minimum value of a constant of friction at the introduction in lubricant a standard wear-resistant additive – dialkyldithiophosphate of zinc (ZDDP). So, at the introduction in coal oil without additives I-20A (viscosity type ISO 32) 1.25 and 2.5% ZGGP maxi-mum contact pressure at which is realized a hydrody-namic mode of friction increases by 1.8 and 2 times accordingly. Because of impossibility to explain experimental data by a chemical interaction of ZDDP with surface material of tribo-coupling there is offered and substantiated a mechanism of ZDDP influence upon rheological parameters of lubricant in a separation layer. A rheological model allowing the computation of the wearresistant additives influence upon a value of hydrodynamic pressures in a lubrication layer is of-fered. The idea of the initiation by a wearresistant additive of multimolecular adsorption of lubricant on the surface of tribocoupling may be used for the optimization of ZDDP structure and also for the prognostication of changes in pressure coefficient of viscosity in a lubrication layer.

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Section: Discussionunclassified

Anti-wear additives influence upon hydrodynamic friction mode parameters in bearings of internal-combustion engines

Задорожная¹,

Zadorozhnaya²,

Mukhortov³

et al. 2016

Bulletin of Bryansk State Technical University

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“…(11), (14), (16) and (18) are discretized using the finite difference method and solved simultaneously to obtain the pressure and the film profiles. The finite difference formulation for the Reynolds equation is provided in Appendix A.…”

Section: Numerical Simulation Proceduresmentioning

confidence: 99%

“…The effect of transient condition was included in the solution by Jalali-Vahid et al [9]. The nonNewtonian behavior of the lubricant in point-contact EHL was investigated in some recent studies [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

On the effect of surface roughness in point-contact EHL: Formulas for film thickness and asperity load

Masjedi

Khonsari

2015

Tribology International

135

103

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“…The relationship between viscosity  and lubricant pressure p can be expressed by the Barus stick pressure formula [16]: …”

Section: Film Thickness Model Of the Inlet Areamentioning

confidence: 99%

Multi-factor coupling system characteristic of the dynamic roll gap in the high-speed rolling mill during the unsteady lubrication process

Wang

Jiang

Zhao

et al. 2013

Tribology International

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Fang, M. (2013). Multi-factor coupling system characteristic of the dynamic roll gap in the high-speed rolling mill during the unsteady lubrication process. Tribology International, 67 174-181.Multi-factor coupling system characteristic of the dynamic roll gap in the high-speed rolling mill during the unsteady lubrication process AbstractIn the present work, a multi-factor coupling dynamic model of a rolling mill system for a dynamic roll gap during an unsteady lubrication process was developed on the basis of the rolling theory, lubrication and the friction theory, and the mechanical vibration theory. The multi-factor coupling model of interfacial film binding was coupled with the rolling force model, dynamic roll gap interface friction model and work roll movement model. The corresponding distributions of friction and pressure at varying surface roughness and times were systematically analyzed during the unsteady mixed lubrication process. The effects of the main processing parameters on the critical speed and amplitude for self-excited vertical vibration were investigated.

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Central film thickness formula for shear thinning lubricants in EHL point contacts under pure rolling

Cited by 24 publications

References 32 publications

Anti-wear additives influence upon hydrodynamic friction mode parameters in bearings of internal-combustion engines

Anti-wear additives influence upon hydrodynamic friction mode parameters in bearings of internal-combustion engines

On the effect of surface roughness in point-contact EHL: Formulas for film thickness and asperity load

Multi-factor coupling system characteristic of the dynamic roll gap in the high-speed rolling mill during the unsteady lubrication process

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