Friction characteristics of microtextured surfaces under mixed and hydrodynamic lubrication

Ramesh, Ashwin; Akram, Wasim; Mishra, S.; Cannon, Andrew; Polycarpou, Andreas A.; King, William P.

doi:10.1016/j.triboint.2012.07.020

Cited by 227 publications

(138 citation statements)

References 33 publications

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“…Vrbka et al [12] used instead an experimental apparatus consisting of two discs loaded against a roller in order to study the effect of surface texturing on rolling contact fatigue in mixed lubricated conditions. Recently, Ramesh et al [13] have utilized standard pin-on-disk equipment to assess the friction reduction achievable by a dimpled surface when the texture is applied to the pin. In this paper a new experimental test apparatus for machine elements, designed and developed by the authors is presented.…”

Section: Fig1mentioning

confidence: 99%

A New Rig for Testing Textured Surfaces in Pure Sliding Conditions

Godi

Grønbæk²,

Mohaghegh

et al. 2013

Tribol Lett

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Throughout the years, it has become more and more important to find new methods for reducing friction and wear occurrence in machine elements. A possible solution is found in texturing the surfaces under tribological contact, as demonstrated by the development and spread of plateau-honed surface for cylinder liners. To prove the efficacy of a particular textured surface, it is paramount to perform experimental tests under controlled laboratory conditions. In this paper a new test rig simulating pure sliding conditions is presented, dubbed Axial Sliding Test. It presents four major components: a rod, a sleeve, a housing and a stripwound container. The rod and the sleeve are the two surfaces in relative sliding motion; the stripwound container maintains a constant, but adjustable normal pressure and the housing serves as interface between the sleeve and the container. For carrying out the test, two machineries are necessary: a press to provide the normal pressure and a tensile machine to perform the axial movements. The test is calibrated so that the correspondence between the normal pressure and the container advancement is found. Preliminary tests are carried out involving a multifunctional and a fine turned rod against a mirror-polished sleeve. Qualitatively the multifunctional surfaces improve the friction conditions, but a more structured test campaign is required. It is furthermore assessed the repeatability of the test device, in order to rely on the results obtained. Ten repetitions made at the same pressure using the fine turned rod displayed good repeatability of the force results both in terms of average values and trends.

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Section: Fig1mentioning

confidence: 99%

A New Rig for Testing Textured Surfaces in Pure Sliding Conditions

Godi

Grønbæk²,

Mohaghegh

et al. 2013

Tribol Lett

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“…In addition to the experimental investigation [1][2][3][4][5], the simulation of lubricated contacts is an important tool for the design process of tribological systems for different applications [6][7][8][9][10]. For the calculation of the hydrodynamic lubrication, the Reynolds equation is commonly used [11].…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach for Modeling Surface Effects in Hydrodynamic Lubrication

et al. 2018

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Abstract:The common approach for the flow factor calculation is based on using the Reynolds equation to simulate the micro-level flow. However, for structured surfaces the fluid flow cannot be represented correctly, due to the assumptions made when deriving the Reynolds equation. In this work, a novel method using the Navier-Stokes equations for the calculation of the micro-level flow is presented and validated against results from Patir and Cheng. The three-dimensional lubrication gap was generated by a rough Gaussian random surface and a perfectly smooth moving counter surface, in order to be available for different numerical methods. The presented results illustrate similar trends for both the approaches. Additionally, the use of the Navier-Stokes equations allows for the observance of surface induced effects which cannot be resolved by the approach of Patir and Cheng. Furthermore, a numerical approach for a shear flow factor calculation with a rough moving surface is presented and validated against other simulation methods. While the validation is maintained with pressure-and temperature-independent density and viscosity, these effects will be taken into account for later research activities of textured surfaces.

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“…According to the results of tests, Kovalchenko et al [4] found that higher dimple density induced higher COFs compared with the disc with standard dimple density. Ramesh et al [5] investigated frictional characteristics of textured surfaces on stainless steel surfaces. Friction forces decreased as the increase of texture density.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Reciprocating Sliding Contacts of Textured Surfaces: Influence of Structure Parameters and Indentation Depth

Tong

Liu

2018

Chin. J. Mech. Eng.

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Textured surfaces are widely used in engineering components as they can improve tribological properties of sliding contacts, while the detailed behaviors of nanoscale reciprocating sliding contacts of textured surfaces are still lack of study. By using multiscale method, two dimensional nanoscale reciprocating sliding contacts of textured surfaces are investigated. The influence of indentation depth, texture shape, texture spacing, and tip radius on the average friction forces and the running-in stages is studied. The results show that the lowest indentation depth can make all the four textured surfaces reach steady state. Surfaces with right-angled trapezoid textures on the right side are better for reducing the running-in stage, and surfaces with right-angled trapezoid textures on the left side are better to reduce wear. Compared with other textured surfaces, the total average friction forces can be reduced by 82.94%-91.49% for the case of the contact between the tip with radius R = 60r 0 and the isosceles trapezoid textured surface. Besides, the total average friction forces increase with the tip radii due to that bigger tip will induce higher contact areas. This research proposes a detailed study on nanoscale reciprocating sliding contacts of textured surfaces, to contribute to design textured surfaces, reduce friction and wear.

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Friction characteristics of microtextured surfaces under mixed and hydrodynamic lubrication

Cited by 227 publications

References 33 publications

A New Rig for Testing Textured Surfaces in Pure Sliding Conditions

A New Rig for Testing Textured Surfaces in Pure Sliding Conditions

A Novel Approach for Modeling Surface Effects in Hydrodynamic Lubrication

Nanoscale Reciprocating Sliding Contacts of Textured Surfaces: Influence of Structure Parameters and Indentation Depth

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