Understanding the role of surface textures in improving the performance of boundary additives, part I: Experimental

Khaemba, Doris N.; Azam, Abdullah; See, TianLong; Neville, Anne; Salehi, Fatemeh

doi:10.1016/j.triboint.2020.106243

Cited by 25 publications

(12 citation statements)

References 50 publications

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“…Surface texturing has gained increasing attention over the last three decades. Boosted by the work of Etsion and co-workers in the 90's [16,22,23], surface textures have been shown capable of beneficially affecting friction and wear under dry friction conditions [24,25] as well as boundary [26][27][28][29], mixed [30][31][32][33], elastohydrodyamic (EHL) [34][35][36] and full-film hydrodynamic lubrication [37][38][39]. Under dry conditions, surface textures help to reduce the real area of contact and trap wear debris, thus lowering friction and extending wear life [18].…”

Section: Introductionmentioning

confidence: 99%

Synergetic effects of surface texturing and solid lubricants to tailor friction and wear – A review

Rosenkranz

Costa

Baykara

et al. 2021

Tribology International

314

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Surface texturing and solid lubricants have demonstrated the ability to substantially reduce friction and wear under dry conditions. In recent decades, these two technologies have been combined to leverage the advantages of both for superior tribological performance. This review article first summarizes the state-of-the-art regarding surface texturing and solid lubricants, including soft metals, polytetrafluoroethylene, diamond-like carbon and 2D layered materials. Then, the synergy between surface textures and solid lubricants is discussed, with particular emphasis on the underlying mechanisms. Finally, gaps in the existing understanding of these synergies are identified and opportunities for future research are suggested.

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Section: Introductionmentioning

confidence: 99%

Synergetic effects of surface texturing and solid lubricants to tailor friction and wear – A review

Rosenkranz

Costa

Baykara

et al. 2021

Tribology International

314

View full text Add to dashboard Cite

show abstract

“…investigate the effects of elliptical grooves and trapezoidal dents on the maximum pressure, load capacity, friction coefficient and minimum film thickness of a limited fluid dynamic bearing. Khaemba et al (Khaemba et al, 2020) used the tribological tests to investigate the effect of three different microtextures on the tribological properties of the friction modifier molybdenum dialkyldithiocarbamate. The effects of important geometric parameters such as the shape, distribution, density, and depth of the micro-texture on the lubrication characteristics have been also analyzed (Pettersson and Jacobson, 2004;Vlȃdescu et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Prediction of Contact and Lubrication Characteristics of Micro-textured Surface Under Thermal Line Contact EHL

Zhao

Zhou

et al. 2021

Front. Mech. Eng.

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In this study, a method combining numerical surface generation technology and three-dimensional hot-line contact EHL is employed to evaluate the contact characteristics of micro-textured surfaces under high-load line contact. Based on numerical simulation, the film thickness, film pressure, friction coefficient and surface flashing temperature of the virtual texture surface with different cross-sectional shapes and sizes are studied. On this basis, the subsurface stress at the contact point is calculated by the DC-FFT algorithm. The results show that, compared with a smooth surface, the micro-textures of different shapes all increase the average oil film thickness of the surface and reduce the friction coefficient, but at the same time lead to an increase in the contact stress of the surface. By changing the width and depth of the texture, the maximum film pressure has changed by 11.4 and 18.5%, respectively.

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“…Texture design tools adopted include experimental [6][7][8][9][10][11][12][13], computational [1,4,[14][15][16][17][18][19][20][21][22][23], analytical [3,5,[24][25][26][27][28][29]. Lubrication conditions investigated include boundary [24,[30][31][32], mixed [11,27,[33][34][35][36], EHL [14,[37][38][39] and hydrodynamic [6,[40][41][42][43][44][45][46][47]…”

Section: Introductionmentioning

confidence: 99%

A Simple Analysis of Texture-Induced Friction Reduction Based on Surface Roughness Ratio

Xuan

Qiao³

et al. 2021

Tribol Lett

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The effect of surface texture on friction reduction under fluid lubrication has been broadly acknowledged in the tribology community. However, the lack of understanding of the underlying mechanisms remains a challenge for the advancement of textured enhanced lubrication. Numerous models have been proposed, but they are almost all based on the hydrodynamic effect alone and have proven cumbersome, system specific and unreflective of the beneficial secondary lubrication provided by the residual lubricants within the texture. This paper presents a simple analysis of texture induced friction reduction based on the actual liquid-solid interface area and the secondary lubrication hypothesis. A simple model based on the surface roughness ratio (the ratio between the actual and projected solid surface area) of the textured surface was proposed which 1) is simple, intuitive, quantitative and sensitive to texture shape and area fraction; 2) directly reflects proposed secondary lubrication mechanisms; 3) reflects the general data trend in the collected literature. By focusing on the variations of key texture parameters, the proposed model combined with a sampling of independent studies in literature has demonstrated that 1) the effect of increased pit depth-to-diameter ratio (d/D) on friction reduction is most significant between 0.01 and 0.2; 2) further increase in d/D only marginally affects the friction coefficient; 3) texture's area fraction plays a much weaker role than the depth/diameter ratio in friction reduction. By quantitatively isolating the secondary lubrication effects, this model may help to link disparate studies in the literature while providing defensible quantitative insights into texture induced lubrication mechanisms.

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Understanding the role of surface textures in improving the performance of boundary additives, part I: Experimental

Abstract: This is a repository copy of Understanding the role of surface textures in improving the performance of boundary additives, part I: Experimental.

Cited by 25 publications

References 50 publications

Synergetic effects of surface texturing and solid lubricants to tailor friction and wear – A review

Synergetic effects of surface texturing and solid lubricants to tailor friction and wear – A review

Prediction of Contact and Lubrication Characteristics of Micro-textured Surface Under Thermal Line Contact EHL

A Simple Analysis of Texture-Induced Friction Reduction Based on Surface Roughness Ratio

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