Study of surface roughness effects in elastohydrodynamic lubrication of rolling line contacts using a deterministic model

2001 ◽  
Vol 34 (10) ◽  
pp. 713-722 ◽  
Author(s):  
Punit Kumar ◽  
S.C Jain ◽  
S Ray
Keyword(s):  
Surface Roughness ◽  
Deterministic Model ◽  
Elastohydrodynamic Lubrication ◽  
Roughness Effects ◽  
Rolling Line ◽  
Line Contacts

Simulation of Plasto-Elastohydrodynamic Lubrication in Line Contacts of Infinite and Finite Length

2015 ◽  
Vol 137 (4) ◽  
Author(s):  
Tao He ◽  
Jiaxu Wang ◽  
Zhanjiang Wang ◽  
Dong Zhu
Keyword(s):  
Surface Roughness ◽  
Finite Length ◽  
3D Model ◽  
Three Dimensional ◽  
Elastohydrodynamic Lubrication ◽  
Axial Direction ◽  
Contact Length ◽  
Line Contact ◽  
Line Contacts ◽  
3D Surface Topography

Line contact is common in many machine components, such as various gears, roller and needle bearings, and cams and followers. Traditionally, line contact is modeled as a two-dimensional (2D) problem when the surfaces are assumed to be smooth or treated stochastically. In reality, however, surface roughness is usually three-dimensional (3D) in nature, so that a 3D model is needed when analyzing contact and lubrication deterministically. Moreover, contact length is often finite, and realistic geometry may possibly include a crowning in the axial direction and round corners or chamfers at two ends. In the present study, plasto-elastohydrodynamic lubrication (PEHL) simulations for line contacts of both infinite and finite length have been conducted, taking into account the effects of surface roughness and possible plastic deformation, with a 3D model that is needed when taking into account the realistic contact geometry and the 3D surface topography. With this newly developed PEHL model, numerical cases are analyzed in order to reveal the PEHL characteristics in different types of line contact.

Surface Roughness and Structural Inertia in a Mode-Based Mass-Conserving Elastohydrodynamic Lubrication Model

1997 ◽  
Vol 119 (3) ◽  
pp. 449-455 ◽  
Author(s):  
S. Boedo ◽  
J. F. Booker
Keyword(s):  
Surface Roughness ◽  
Performance Evaluation ◽  
Film Thickness ◽  
Computational Model ◽  
Elastohydrodynamic Lubrication ◽  
Mode Shapes ◽  
Connecting Rod ◽  
Roughness Effects ◽  
Structural Inertia ◽  
Structural Motion

Detailed formulations are presented for a mass-conserving, mode-based computational model which includes effects of structural inertia and surface roughness. Performance evaluation of a big end connecting rod hearing is shown to require only a few mode shapes, from which it is found that body forces arising from structural motion strongly influence film thickness history at operating engine speeds. Surface roughness effects on nominal film thickness are found to be small, even in assumed regions of partial lubrication.

Prevention of interfacial slippage in isothermal pure rolling line contact elastohydrodynamic lubrication under heavy loads

2003 ◽  
Vol 217 (4) ◽  
pp. 323-332 ◽  
Author(s):  
Yongbin Zhang
Keyword(s):  
Carrying Capacity ◽  
Elastohydrodynamic Lubrication ◽  
Load Carrying Capacity ◽  
Pure Rolling ◽  
Load Carrying ◽  
Rolling Line ◽  
Line Contacts ◽  
Heavy Loads ◽  
Inlet Zone ◽  
Interfacial Slippage

The contact-lubricant interfacial slippage, near and in the inlet zone, significantly reduces the load-carrying capacity of elastohydrodynamic lubrication (EHL) in isothermal pure rolling line contacts under heavy loads. The EHL load-carrying capacity can be significantly improved by the prevention of this interfacial slippage. Equations are derived for predicting the critical interfacial limiting shear stress, which is the least for preventing this interfacial slippage. These equations can be used for designing the EHL system of which the load-carrying capacity is not reduced by this slippage.

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