Frictional Performance of a Textured Surface with Elliptical Dimples: Geometric and Distribution Effects

Bai, Linqing; Bai, Shaoxian

doi:10.1080/10402004.2014.939317

Cited by 32 publications

(16 citation statements)

References 13 publications

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“…Most experiments were conducted with traditional tribometers (unidirectional pinon-disc [11][12][13][14][15][16] or reciprocating sliding [17][18][19][20][21][22][23][24] tests), while other studies were conducted on real components, including journal bearings [25] thrust bearings [26][27][28] and mechanical seals [29][30][31]. To date, various surface texturing techniques have already been introduced, such as laser surface texturing (LST); reactive ion etching (RIE); embossing technique; "Lithographie, Galvanoformung, Abformung" (LIGA) process; abrasive jet machining (AJM), electrolytic etching, and so on.…”

Section: Introductionmentioning

confidence: 99%

A Novel Surface Texture Shape for Directional Friction Control

Lu¹,

Wood²,

Gee

et al. 2018

Tribol Lett

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An experimental study is presented to evaluate the influence of anisotropically shaped textures on the behaviour of sliding friction and sensitivity to sliding direction. The plate samples were textured with triangular sloped dimples using an ultrafast laser surface texturing technique. Reciprocating cylinder-on-plate tests were conducted with steel sliding pairs using mineral base oil as a lubricant to compare the tribological performance of reference non-textured specimen and dimpled samples. The dimples were designed with varying converging angles in the transverse y-z plane and top-view x-y plane. In this study, no dimple was fully covered in the contact area since the dimples size is much larger than the Hertzian line contact width. Stribeck style dynamic friction curves across boundary, mixed and hydrodynamic lubrication regimes were used to determine the benefit or antagonism of texturing. Observation of the directional friction effect of the anisotropic textures indicated that the converging shapes are beneficial for friction reduction, and the dimpled specimens have a lower friction coefficient particular under prevailing boundary lubrication conditions. It was also found that the real contact length variation rate is a major factor controlling the local friction response. The sloped bottoms of the textures produce effective converging wedge action to generate hydrodynamic pressure and contribute to the overall directional friction effects.

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Section: Introductionmentioning

confidence: 99%

A Novel Surface Texture Shape for Directional Friction Control

Lu¹,

Wood²,

Gee

et al. 2018

Tribol Lett

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“…Am günstigsten erwiesen sich die fischgrätenähnlich angeordneten Linienmuster mit einer Tiefe von 3 µm und einem Flächenanteil von 60 %. Schließlich erzielten BAI et al [81], mit zweireihig und zur Gleitbewegung schräg angeordneten, ellipsoide Texturen mit einer großen und kleine Halbachse von 900 zu 300 µm, einer Flächendichte von 20 % und einer Tiefe von 6-7 µm die niedrigste Reibung unter den untersuchten Texturen.…”

Section: Experimentelle Arbeitenunclassified

Untersuchungen zur Wirkungsweise von Mikrotexturen in elastohydrodynamischen Gleit-/Wälzkontakten

Weschta¹

2018

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Motivation und Problemstellung Die Energie- und Ressourceneffizienz technischer Produkte besitzt sowohl im Bewusstsein der Bevölkerung und damit der Nutzer bzw. Käufer als auch aufgrund regulatorischer Anforderungen durch Behörden eine immer größere Bedeutung. Knapper werdende Rohstoffe sowie eine internationale Klimaschutzpolitik erzwingen die Reduzierung von klimarelevanten Gasen und somit vor allem der CO2-Emissionen. Was dies konkret bedeutet, soll am Beispiel des Automobils aufgezeigt werden: etwa 20 % des CO2- Ausstoßes sind in Deutschland im Bereich Verkehr zu verorten wovon wiederum 84 % auf den Straßenverkehr zurückgehen [1]. Über Deutschland hinaus spielt der Straßenverkehr aber auch weltweit eine wichtige Rolle bei den Emissionen. Allein die Zahl der PKW steigt tendenziell von aktuell 0,9 Milliarden [2] durch den Aufstieg der Schwellenländer bis 2035 auf 1,7 Milliarden und bis 2050 auf 2-3 Milliarden PKW an [3, 4]. Für die dabei in Zukunft anzutreffenden Antriebs...

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“…They distinguish between “single‐row” and “double row” elliptical patterns that are inclined by an angle of 40° (long axis of the ellipse with respect to a horizontal line). The results underline that inclined double‐row elliptical patterns show an improved frictional performance under hydrodynamic lubrication . Lu and Khonsari investigated the effect of dimple shape (circular and elliptical structures) and fabrication technique (machining or etching) on the frictional response evaluated by recording Stribeck‐like curves.…”

Section: Introductionmentioning

confidence: 98%

Friction Reduction Induced by Elliptical Surface Patterns under Lubricated Conditions

et al. 2017

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Recording Stribeck-like curves is an efficient way to evaluate the frictional performance and efficiency of patterned surfaces. Elliptical patterns with varying area density and structural depth are fabricated by micro-coining on steel substrates (AISI 304). A ball-on-disc tribometer is used to perform unidirectional sliding experiments for the polished reference and the elliptical patterns dependent on the sliding velocity. In this study, a clear connection between structural parameters such as length of long and short axis, aspect ratio, and pitch with the frictional behavior can be found. Comparing patterns with comparable depth and area density underlines that elliptical patterns having larger individual features (increased length of both axes) separated by a larger pitch reduce the COF more significantly. The number of tribologically active individual elliptical structures, recirculation effects of the lubricant, as well as the pattern geometry that may lead to undesired edge effects and stress concentrations need to be taken into consideration to explain those findings. The sample with the smallest structural depth, the smallest area density, and the lowest aspect ratio (A1) leads to the maximum friction reduction (4-fold) for all velocities which underlines the enormous potential of elliptical structures in terms of friction reduction.

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Frictional Performance of a Textured Surface with Elliptical Dimples: Geometric and Distribution Effects

Cited by 32 publications

References 13 publications

A Novel Surface Texture Shape for Directional Friction Control

A Novel Surface Texture Shape for Directional Friction Control

Untersuchungen zur Wirkungsweise von Mikrotexturen in elastohydrodynamischen Gleit-/Wälzkontakten

Friction Reduction Induced by Elliptical Surface Patterns under Lubricated Conditions

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