Effects of surface texturing on the frictional behavior of cast iron surfaces

Kim, Beomkeun; Chae, Young Hun; Choi, Heung Soap

doi:10.1016/j.triboint.2013.10.006

Cited by 68 publications

(38 citation statements)

References 21 publications

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“…Rather, we again find an optimal value. In the existing literature, one can find authors who concluded that the textured area has very little influence [31], while others reported that a textured area of 5% yielded the lowest friction forces experimentally and of 40% in the corresponding numerical study [24]. Here, as in our case, friction forces were lowered by about 75% through introducing a texture with a packing density of 10% [24].…”

Section: Discussionsupporting

confidence: 49%

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Laser Textured Surfaces for Mixed Lubrication: Influence of Aspect Ratio, Textured Area and Dimple Arrangement

2017

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Abstract:Unidirectional sliding experiments with polished and laser textured steel surfaces were carried out to investigate the effects of different textured area densities, aspect ratios and dimple arrangements. The system was lubricated with Polyalphaolefin (PAO) at 100 °C and the contact pressure was 3 MPa. For measuring Stribeck curves, the sliding speed was controlled between 40 and 2000 mm/s. The textured area density was varied between 5% and 30%, with the lowest friction values found for 10%. Aspect ratios ranging from 0.02 to 0.2 were investigated and for 0.1 the lowest friction values were measured. The dimple arrangements tested were cubic, hexagonal and a random distribution for a textured area density of 10% and an aspect ratio of 0.1. Our results demonstrate that the dimple arrangement does affect friction values, hinting to the fact that individual texture elements do influence each other. The optimum dimple arrangement was found in a hexagonal packing. This systematic variation of these three key texturing parameters for the morphological texturing of a tribological surface with dimples will allow a strategic choice of texturing parameters. This makes the most of the tremendous potential that laser surface texturing has for reducing friction forces and thereby CO2 emissions.

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Section: Discussionsupporting

confidence: 49%

“…The reason why we concentrated on aspect ratios around 0.1 is that other authors previously reported an optimal aspect ratio for values of approximately 0.1 [19,26,[29][30][31][32]. There was one notable exception, where an optimum at 0.01 was found [24].…”

Section: Discussionmentioning

confidence: 95%

Laser Textured Surfaces for Mixed Lubrication: Influence of Aspect Ratio, Textured Area and Dimple Arrangement

2017

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“…In addition, the surface texturing also provides extra space to reserve lubricant and entrap wear debris. Furthermore, parametric studies were conducted for various applications such as thrust bearings [10–12], journal bearings [13], engine cylinders [14–17] and mechanical seals [3,18]. It was concluded that there are optimal texturing parameters with which the friction pair exhibits optimal tribological performance.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the tribological performance of micro-dimple textured surfaces under hydrodynamic lubrication

Jing

et al. 2017

Beilstein J. Nanotechnol.

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Surface texturing is an important approach for controlling the tribological behavior of friction pairs used in mechanical and biological engineering. In this study, by utilizing the method of three-dimensional computational fluid dynamics (CFD) simulation, the lubrication model of a friction pair with micro-dimple array was established based on the Navier–Stokes equations. The typical pressure distribution of the lubricant film was analyzed. It was found that a positive hydrodynamic pressure is generated in the convergent part of the micro-dimple, while a negative hydrodynamic pressure is generated in the divergent part. With suitable parameters, the total integration of the pressure is positive, which can increase the load-carrying capacity of a friction pair. The effects of the micro-dimple parameters as well as fluid properties on tribological performance were investigated. It was concluded that under the condition of hydrodynamic lubrication, the main mechanism for the improvement in the tribological performance is the combined effects of wedging and recirculation. Within the range of parameters investigated in this study, the optimum texture density is 13%, while the optimum aspect ratio varies with the Reynolds number. For a given Reynolds number, there exists a combination of texture density and aspect ratio at which the optimum tribological performance could be obtained. Conclusions from this study could be helpful for the design of texture parameters in mechanical friction components and even in artificial joints.

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“…It is however to be noted that the results are valid for sliding contacts with compressible fluid medium. Kim et al [8] concluded that the effect of aspect ratio of texture shape on the friction reduction is dominant while the texture density has a marginal influence. Fabricated by laser surface texturing technique, Cho and Choi [9] reported that the friction of the textured surface decreases regardless of the texture density and the aspect ratio and the optimum texture density and the depth for all the sliding conditions studied were found to be 25% and 25 μm, respectively.…”

Section: Introductionmentioning

confidence: 99%

New Star-Like Surfacetexture for Enhanced Hydrodynamic Lubrication Performance

Uddin

Liu

Shankar³

2017

Archives of Metallurgy and Materials

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This paper presents a numerical modelling and optimization of a new 'star-like' geometric texture shape with an aim to improve tribological performance. Initial studies showed that the triangle effect is the most dominant in reducing the friction. Motivated with this, a 'star-like' texture shape consisting of a series of triangular spikes around the centre of the texture is proposed. It is hypothesised that by increasing the triangular effect on a texture shape, the converging micro-wedge effect is expected to increase, hence increasing the film pressure and reducing the friction. Using the well-known Reynolds boundary conditions, numerical modelling of surface texturing is implemented via finite difference method. Simulation results showed that the number of apex points of the new 'star-like' texture has a significant effect on the film pressure and the friction coefficient. A 6-pointed texture at a texture density of 0.4 is shown to be the optimum shape. The new optimum star-like texture reduces the friction coefficient by 80%, 64.39%, 19.32% and 16.14%, as compared to ellipse, chevron, triangle and circle, respectively. This indicates the potential benefit of the proposed new shape in further enhancing the hydrodynamic lubrication performance of slider bearing contacts.

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Effects of surface texturing on the frictional behavior of cast iron surfaces

Cited by 68 publications

References 21 publications

Laser Textured Surfaces for Mixed Lubrication: Influence of Aspect Ratio, Textured Area and Dimple Arrangement

Laser Textured Surfaces for Mixed Lubrication: Influence of Aspect Ratio, Textured Area and Dimple Arrangement

Numerical investigation of the tribological performance of micro-dimple textured surfaces under hydrodynamic lubrication

New Star-Like Surfacetexture for Enhanced Hydrodynamic Lubrication Performance

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