State of the art of friction modelling at interfaces subjected to elastohydrodynamic lubrication (EHL)

Bi, Zhuming; Mueller, Donald W.; Zhang, Wenjun

doi:10.1007/s40544-020-0449-1

Cited by 17 publications

(9 citation statements)

References 116 publications

(140 reference statements)

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“…In order to optimize functionalization of high-friction surfaces via surface texturing, analytical and numerical modelling approaches are urgently needed. Numerical modelling has already been successfully used to predict the tribological performance of surface textures under hydrodynamic [57,70,68,69,148,149] and elastohydrodynamic conditions [150][151][152][153][154]. Significant research progress has been also made related to the numerical prediction of mixed lubrication [59,155,156].…”

Section: Current Short-comings Future Research Directions and Conclud...mentioning

confidence: 99%

Tailored surface textures to increase friction—A review

2022

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Surface textures with micro-scale feature dimensions still hold great potential to enhance the frictional performance of tribological systems. Apart from the ability of surface texturing to reduce friction, surface textures can also be used to intentionally increase friction in various applications that rely on friction for their adequate functioning. Therefore, this review aims at presenting the state-of-the-art regarding textured surfaces for high-friction purposes. After a brief general introduction, the recent trends and future paths in laser surface texturing are summarized. Then, the potential of surface textures to increase friction in different applications including adhesion, movement transmission and control, biomimetic applications, and road-tire contacts is critically discussed. Special emphasis in this section is laid on the involved mechanisms responsible for friction increase. Finally, current short-comings and future research directions are pointed out thus emphasizing the great potential of (laser-based) surface texturing methods for innovations in modern surface engineering.

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Section: Current Short-comings Future Research Directions and Conclud...mentioning

confidence: 99%

Tailored surface textures to increase friction—A review

2022

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“…P is the density of the oil at 20 ℃ under atmospheric pressure, known as the standard density. β T is the temperature expansion coefficient of the lubricating oil [29]. Mobil 5W30 was used as the lubricating oil, and its parameters are shown in Table 1.…”

Section: Density-pressure and Density-temperature Effectmentioning

confidence: 99%

Friction Properties and Distribution Rule of Lubricant Film of Full Ceramic Ball Bearing Under Different Service Condition

Sun¹

2021

Ceramics - Silikaty

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Full ceramic ball bearings are widely used in extreme and complex conditions, such as ultra-high/low temperature, ultrahigh speed, corrosion and insulation, because of their material specificity. In order to reveal the friction and lubrication properties, improve the service performance life of all ceramic ball bearings, a mathematical model of the oil lubrication for full ceramic ball bearings has been established in this paper. The distribution rule of the lubricant film in the contact area under different speeds and loads were analysed. The main factors influencing the peak mutation of the lubricant film pressure are clearly defined. The results are compared and analysed by using a ball-disc rolling lubricant film test machine. The study found that the thickness of the lubricant film of a full ceramic ball bearing is positively correlated with the bearing speed and negatively correlated with the bearing loads. The bearing speed has a relatively large effect on the change in the lubricant film thickness. The pressure of the lubricant film in the contact area is positively correlated with the bearing speed, but it is not affected by the bearing load. Unlike metal ball bearings, the thickness and pressure of the lubricant film have a greater relative rate of change in different positions in the contact area of full ceramic ball bearings. With an increase in the bearing speed, the necking-down effect has a greater influence on the peak mutation of the oil pressure. Only one pressure peak occurs in the oil film in the contact area. The results of this paper play an important role in revealing the friction and lubrication properties of full ceramic ball bearings and improving their service performance and life under oil lubrication conditions.

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“…Thus, a friction contribution due to the fluid should be included, e.g. by means of an effective formula taking into account viscosity and pressure [28]. This would increase the estimation of the friction coefficient.…”

Section: Lubricationmentioning

confidence: 99%

“…Lubrication allows to minimize the frictional resistance [27], but it poses open challenges due to the coupling between elastoplastic and hydrodynamic effects. Many methods have been introduced to investigate these systems [28], among them the Reynolds equations [29,30] coupled with those for solid deformations in the thin lubricant film regime [31,32]. Efficient solution techniques have been proposed [33,34] to obtain useful insights for these systems, but issues can arise for convergence [35] and the required computational power [36].…”

Section: Introductionmentioning

confidence: 99%

A Simple Mechanistic Model for Friction of Rough Partially Lubricated Surfaces

Costagliola

Brink

Richard³

et al. 2021

Tribol Lett

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We report experimental measurements of friction between an aluminum alloy sliding over steel with various lubricant densities. Using the topography scans of the surfaces as input, we calculate the real contact area using the boundary element method and the dynamic friction coefficient by means of a simple mechanistic model. Partial lubrication of the surfaces is accounted for by a random deposition model of oil droplets. Our approach reproduces the qualitative trends of a decrease of the macroscopic friction coefficient with applied pressure, due to a larger fraction of the micro-contacts being lubricated for larger loads. This approach relates direct measurements of surface topography to realistic distributions of lubricant, suggesting possible model extensions towards quantitative predictions.

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State of the art of friction modelling at interfaces subjected to elastohydrodynamic lubrication (EHL)

Cited by 17 publications

References 116 publications

Tailored surface textures to increase friction—A review

Tailored surface textures to increase friction—A review

Friction Properties and Distribution Rule of Lubricant Film of Full Ceramic Ball Bearing Under Different Service Condition

A Simple Mechanistic Model for Friction of Rough Partially Lubricated Surfaces

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