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A Mathematical Model for the Mixed Lubrication of Non

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HYDRODYNAMIC LUBRICATION IN COLD ROLLING A. G. ATKIN

HYDRODYNAMIC LUBRICATION IN COLD ROLLING A. G. ATKINS* ... Although the mathematical model predicts a "speed effect" for rolling (plots of rolling ... Thus speed effects in the literature must have been caused by a change over from boundary to mixed lubrication and lubricant puddle entrapment in surface microcrevices. ...

A Fatigue Model for Spur Gear Contacts Operating Under .

This paper presents a model to predict the crack formation fatigue lives of spur gear contacts operating under mixed lubrication conditions where surface roughnesses introduce intermittent metal-to-metal contacts and severe stress concentrations.

A mathematical model for the mixed lubrication of non .

A mathematical model is presented in this paper for rolling-sliding contacts operating in a mixed regime of elastohydrodynamic lubrication and boundary lubrication. The model is based on the framework of Johnson et al. (1972, "A Simple Theory of Asperity Contacts in Elastohydrodynamic Lubrication," Wear, 19, pp. 91-108).

On the Stribeck Curves for Lubricated Counterformal Contacts of Rough Surfac

In the present study, numerical solutions in counterformal contacts of rough surfaces are obtained by using the unified deterministic mixed elastohydrodynamic lubrication (EHL) model recently developed.

A mathematical model of the hydro-support: an elasto .

2. Model. The mathematical model of the hydro-support must describe a number of physical phenomena: • Track surface geometry. One of the typical properties of the hydro-support as studied in this paper, is the relative large surface waviness of one of the surfaces. • Mixed lubrication model. In the contact areas between bearing and track ...

On a Model for the Prediction of the ... - SpringerLi

A model based on coupled contact approach was used by Bobach et al. to calculate friction in mixed lubrication. The half-space theory was employed to pre-calculate the dry mean contact pressure as a function of deformed gap height by assuming nominally flat surfaces in contact.

Proc IMechE Part J: Effect of surface spacing parameters .

cially Pc, on average lubrication film thickness, ratio of contact area, ratio of contact load and non-dimen-sional maximum pressure are researched with the semi-system approach. Mathematical model According to the studies of Zhu and Hu,8 Wang et al.,9 and Hu and Zhu,10 a mathematical model is built for the mixed lubrication in point contacts. In

A computer model of mixed lubrication in point contacts .

A numerical model of mixed lubrication is presented in this paper. The idea introduced here is that asperity contact may be viewed as a result of a continuous decrease in film thickness, so that the transition between contact and non-contact is continuous and the same mathematical model should work for both regions.

Penn State Engineering: MNE Directo

Liming Chang and Y. R. Jeng, 2014, "A mathematical model for the mixed lubrication of non-conformable contacts with asperity friction, plastic deformation, flash temperature and tribo-chemistry", ASME Journal of Tribology, 136, pp. 022301

Multi-scale modelling of the behaviour of ionic liquids .

Multi-scale modelling of the behaviour of ionic liquids associated with mixed lubrication in porous bearings A. Manoylov 1, A. C. F. Mendonça2, ... The model also takes into account the highly non-Newtonian behaviour of ionic liquids under extreme temperature and pressure conditions

A computer model of mixed lubrication in point contacts .

Abstract. A numerical model of mixed lubrication is presented in this paper. The idea introduced here is that asperity contact may be viewed as a result of a continuous decrease in film thickness, so that the transition between contact and non-contact is continuous and the same mathematical model should work for both regions.

Prediction on Lubrication and Friction of Mold Flux Based .

Following Newton law of viscosity, Coulomb law of friction and mixed lubrication theory, the mathematical model of mold flux lubricated and frictional behavior was proposed on the basis of considering different contact states between mold flux and strand surface, which could be used to discriminate and quantize lubricated behavior of mold slag ...

NUMERICAL SIMULATION OF A SLIPPER MODEL FOR WATER .

This model is based on a combination of the asperity-contacting model proposed by Greenwood and Williamson (GW model) [10] and the average flow model by Patir and Cheng (PC model) [11– 12]. The former is a model for a contact mechanism of non-lubricated stationary rough surfaces. The latter is an approach using fluid film lubrication to the ...

1. Introduction - Hindawi Publishing Corporati

Wei et al. [19] proposed a mathematical model including the Reynolds equation, the particle load carrying equation, the asperity contact equation, and the heat balance equation in order to simulate the mixed liquid-solid lubrication. The effects of the mixed liquid-solid lubricant, the particle diameter and mass concentration, the surface ...

Prediction of Sliding Friction Force of Rough Surfaces in .

A mixed lubrication model,based on an unified Reynolds equation in all lubrication regimes including elastohydrodynamic,mixed and boundary lubrication,for prediction of the ...

MATHEMATICAL DESCRIPTION OF LUBRICATION FLOW BETWEEN ROUGH .

MATHEMATICAL DESCRIPTION OF LUBRICATION FLOW BETWEEN ROUGH SURFACES OF A PLAIN BEARING IN MIXED FRICTION V. V. KHARLAMOV, S. V. PAVLYSHKO Institute of Engineering Sciences, Ural Branch of the Russian Academy of Sciences, 34 Comsomolskaya st., 620219,

On a Model for the Prediction of the Friction Coefficient .

A new model was developed for the simulation of the friction coefficient in lubricated sliding line contacts. A half-space-based contact algorithm was linked with a numerical elasto-hydrodynamic lubrication solver using the load-sharing concept. The model was compared with an existing asperity-based ...

Numerical investigation of tribological performance in .

Numerical investigation of tribological performance in mixed lubrication of textured piston ring-liner conjunction with a non-circular cylinder bore. ... A 2D mixed lubrication model, which consists of a generalized Reynolds equation ... Mathematical model 2.1. Ring surface texturing.

Journal Bearings Lubrication Aspect Analysis Using Non .

The aim of this work is related to an analysis of journal bearings lubrication using non-Newtonian fluids which are described by a power-law model. The performance characteristics of the journal bearings are determined for various values of the non-Newtonian power-law index “” which is equal to: 0.9, 1, and 1.1. Obtained numerical results show that for the dilatant fluids (), the load ...

Effects of Non-Newtonian Lubricants on Surface Roughness .

Non-Newtonian fluid behavior is assumed in the model which further increases its complexity. In order to solve the system of equations the multigrid techniques are applied. The thesis contains the mathematical model describing the problem and a detailed description of the multigrid method.

Mixed convection of non-newtonian fluids from a vertical .

VoI .6, No.3 Wang Chaoyang et al .: Mixed ConVection of Non-Newtonian Fluids 215 forced convection of non-Newtonian fluids from a vertical isothermal plate embedded in a homogenous porous medium. II. MATHEMATICAL MODEL Consider the flow of non-Newtonian fluids at controlled pressure gradient along an isothermal