The effect of surface texturing on thin EHD lubrication films

Křupka, Ivan; Hartl, Martin

doi:10.1016/j.triboint.2006.10.007

Cited by 103 publications

(61 citation statements)

References 25 publications

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“…They suppress abrasion and ploughing friction and third-body wear, resulting in improved fretting fatigue resistance, longer durability and hence reliability. This is very common idea amongst different researchers such as Blatter et al (1999), Fenske et al (2003), Alberdi et al (2004), Erdemir et al (2004a and b), Kovalchenko et al (2005), Etsion (2005), Wong et al (2006), Andersson et al (2007), Costa and Hutchings (2007), and Krupka and Hartl (2007).…”

Section: The Mechanisms Behind Tribological Improvements Through Surfmentioning

confidence: 92%

“…Micro-dimpling has also been achieved with AJM (abrasive jet machining) by Wakuda et al (2003), while using mechanical scribing through utilising a Rockwell indenter. Hsu et al (2003) and Krupka and Hartl (2007) have produced grooves and dimples on the metal surface. Examples of textured surfaces produced by indentation using a hardness tester can be found in Pettersson (2005), for instance.…”

Section: Surface Texturing Methodsmentioning

confidence: 99%

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Optimised textured surfaces with application in piston ring/cylinder liner contact

Rahmani

Shirvani

2010

Tribology and Dynamics of Engine and Powertrain

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This item was submitted to Loughborough's Institutional Repository (https://dspace.lboro.ac.uk/) by the author and is made available under the following Creative Commons Licence conditions.For the full text of this licence, please go to: http://creativecommons.org/licenses/by-nc-nd/2.5/ In: Tribology and Dynamics of Engine and Powertrain: Fundamentals, Applications and Future Trends, Edited by H. Rahnejat, Woodhead Publishing, 2010, pp. 470-517, ISBN: 978-1-84569-993-2 Chapter 14 Optimised Textured Surfaces with Application in Piston-Ring/Cylinder Liner Contact R. RAHMANI, Loughborough University, UK A. SHIRVANI and H. SHIRVANI, Anglia Ruskin University, UK Abstract: The application of textured surfaces in tribology has recently gained a huge momentum. In this chapter, a systematic approach to investigate the maximum outcomes from employing such surfaces is introduced with an insight into their application in internal combustion engines. A combination of various affecting parameters on the tribological performance of such surfaces is studied and the optimum results were introduced. The effect of employing such optimised textures in enhancing the lubrication condition in piston ring/cylinder liner contact is also studied.Key words: surface texturing, piston ring/cylinder liner contact, optimisation, slider bearings IntroductionIn general, friction is inherent to and is produced between bodies in contact with relative motion. Friction tends to oppose this relative motion between the bodies through loss of energy mostly in the form of heat, mechanical vibration and noise. Therefore, in most cases, friction is an unfavourable phenomenon. In some cases introduction of friction is desired, for example in order to slow down a moving car, the brakes are used to reduce the existing kinetic energy in the wheels by means of producing frictional losses. However, in most of the cases, facilitating this relative motion between bodies is of concern and as a result, one needs to overcome friction so that the relative motion pursues with a minimal loss of energy.Excessive friction can cause damage to the surfaces in contact in several ways and as a result make them wear. Since the surfaces are damaged due to wear, the rate of energy dissipation due to friction increases and consequently amplifies the rate of wear itself (see Chapter 2).The reason for the existence of friction is mainly that in reality, there is no perfect smooth surface. In fact, surfaces have a degree of roughness in the form of small 'hills' and 'valleys' no matter how well they are prepared. When two surfaces, which are in contact with each other, are put into relative motion, the asperities on the In: Tribology and Dynamics of Engine and Powertrain: Fundamentals, Applications and Future Trends, Edited by H. Rahnejat, Woodhead Publishing, 2010, pp. 470-517, ISBN: 978-1-84569-993-2 opposing surfaces become locked hence inducing friction as initially proposed by Amontons for onset of motion and later under kinetic conditions by Coulomb (see Chapter 2). W...

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Section: The Mechanisms Behind Tribological Improvements Through Surfmentioning

confidence: 92%

Section: Surface Texturing Methodsmentioning

confidence: 99%

Optimised textured surfaces with application in piston ring/cylinder liner contact

Rahmani

Shirvani

2010

Tribology and Dynamics of Engine and Powertrain

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“…The potential of topographical features to improve bearing performance has increased the importance of surface roughness and texturing within bearing design [4]. A number of authors have sought solutions to the Reynolds equation which fully resolve lubrication flow at both the scale of topography and that of the bearing contact region [5][6][7][8].A s topographical features become more important flow analyses based on solutions of the Stokes or Navier-Stokes equations have been shown to be more accurate than those based on the traditional Reynolds equation [9].…”

Section: Introductionmentioning

confidence: 99%

Two-scale EHL: Three-dimensional topography in tilted-pad bearings

Boer

Hewson

Thompson

et al. 2014

Tribology International

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Derived from the Heterogeneous Multiscale Methods (HMM), a two-scale method is developed for the analysis of Elastohydrodynamic Lubrication (EHL) and micro-EHL in tilted-pad bearings with threedimensional topography. A relationship linking the pressure gradient to mass flow rate is derived and represented in the bearing domain through homogenisation of near-periodic simulations describing the Fluid Structure Interaction (FSI) of topographical features. For the parameters investigated the influence of compressibility and piezoviscosity was found to be more significant than that of non-Newtonian (shear-thinning) behaviour on textured bearing performance. As the size of topography increased twoscale solutions demonstrated that at constant load the coefficient of friction increased and the minimum film thickness decreased over a range of pad lengths and tilt angles.

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“…Their conclusion was that deep dents lead to film decrease or collapse while shallow indentations produce significant film increase. The importance of shallow dent geometry and conditions of faster surface with indentations was highlighted by other study [6], further extended to mixed lubrication regime [7,8] and the case of motion start-up and reversal [9]. The effect of dent bottom shape was studied in [10] by numerical simulations.…”

Section: Introductionmentioning

confidence: 91%

Prediction of Shallow Indentation Effects in a Rolling-Sliding EHL Contact Based on Amplitude Attenuation Theory

et al. 2017

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In this paper amplitude attenuation theory is used to predict film thickness variations caused by shallow indentation inside a rolling-sliding elastohydrodynamic (EHL) contact. The model providing a complete analytical description of roughness passage through the contact is considered. The estimation model is compared with film thickness measurement obtained by optical interferometry. The in-contact effects for several shapes of indentation were simulated. It is clearly shown that optimal indentation profile should have smooth shape with large diameter and small depth. The results were generally explained on theoretical curves which bring a clear insight into the transient phenomenon and can be used as a rapid engineering tool.

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The effect of surface texturing on thin EHD lubrication films

Cited by 103 publications

References 25 publications

Optimised textured surfaces with application in piston ring/cylinder liner contact

Optimised textured surfaces with application in piston ring/cylinder liner contact

Two-scale EHL: Three-dimensional topography in tilted-pad bearings

Prediction of Shallow Indentation Effects in a Rolling-Sliding EHL Contact Based on Amplitude Attenuation Theory

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