Influence on friction behavior of micro-texturing under lubricated non-conformal contact
TL;DR: In this article, the effect of multi-dimple LST steel surfaces on tribological properties under non-conforming contact was investigated, and the results indicated that the surface with multidimensional textured patterns had better friction performance than the untextured and singledimple textured surfaces.
Abstract: Laser surface texturing (LST) is a well-known surface engineering process used to create arranged dimples on surface using a material ablation process. In this process, a well arranged micro-dimple can produce significant improvements of engineering components in aspects such as load carrying capacity, wear resistance, wetting characteristics and reduction of friction coefficient. In the present work, we investigated the effect of multi-dimple LST steel surfaces on tribological properties under non-conforming contact. The multi-dimple textured surfaces with some specific formula arrays were fabricated by laser ablation process on steel disc by combining patterns of circles and triangles, and circles and squares, having different dimple densities to optimize the surface texturing effect on tribological performance. The tribological test of multi-dimple textured surface was performed by a ball-on-flat unidirectional tribometer in lubricated condition, and the results compared with that of a single-dimple and untextured (polished and ground) surfaces. The results indicate that the surface with multi-dimple textured patterns had better friction performance than the untextured and single-dimple textured surfaces. The beneficial effect of multi-dimple textured patterns was associated with transition of lubrication from boundary to mixed lubrication regime.
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TL;DR: In this paper, the effects of surface textures under the operative lubrication regimes in the Stribeck curve, with a clear distinction between conformal-and non-conformal contacts, are discussed.
478 citations
TL;DR: A wide range of fundamental applications, specifically in aerospace components, automobile parts, wind turbines, micro‐/nano‐electromechanical systems, atomic force microscopes, and biomedical devices are highlighted.
Abstract: There has been tremendous interest in the development of different innovative wear-resistant materials, which can help to reduce energy losses resulted from friction and wear by ≈40% over the next 10-15 years. This paper provides a comprehensive review of the recent progress on designs, properties, and applications of wear-resistant materials, starting with an introduction of various advanced technologies for the fabrication of wear-resistant materials and anti-wear structures with their wear mechanisms. Typical strategies of surface engineering and matrix strengthening for the development of wear-resistant materials are then analyzed, focusing on the development of coatings, surface texturing, surface hardening, architecture, and the exploration of matrix compositions, microstructures, and reinforcements. Afterward, the relationship between the wear resistance of a material and its intrinsic properties including hardness, stiffness, strength, and cyclic plasticity is discussed with underlying mechanisms, such as the lattice distortion effect, bonding strength effect, grain size effect, precipitation effect, grain boundary effect, dislocation or twinning effect. A wide range of fundamental applications, specifically in aerospace components, automobile parts, wind turbines, micro-/nano-electromechanical systems, atomic force microscopes, and biomedical devices are highlighted. This review is concluded with prospects on challenges and future directions in this critical field.
140 citations
TL;DR: In this paper, the authors summarized the information available related to the preparation of surface textures and performance outcomes in the presence of surface texture at the concentrated contacts, and reviewed the current status of research in the area and outlining the future prospects.
Abstract: Benefits of surface textures for improving the performance behaviors of tribo-contacts are being explored and established by the investigators across the globe. But the consolidated information of findings of such explorations are spread. Therefore, the objective of this paper is to summarize the information available related to the preparation of surface textures and performance outcomes in the presence of surface textures at the concentrated contacts. Mainly, recent research findings and practices followed for the study of friction, wear, lubrication, contact fatigue, vibration, and noise at the generic concentrated contacts in presence of surface textures are reviewed for current status of research in the area and outlining the future prospects.
106 citations
TL;DR: In this article, the effects of surface texturing geometrical parameters on the performance of two applications piston ring/cylinder assembly and mechanical seals were investigated, including depth, diameter, depth to diameter ratio, shape and density of dimples.
Abstract: Surface texturing has been effectively used to improve tribological performance of sliding surfaces. Reduction in friction, increase in hydrodynamic load carrying capacity, reduction in wear and increase in fluid film stiffness are few examples of the benefits that can be obtained by surface texturing. In order to obtain these benefits, several researchers have investigated the effects of surface texturing geometrical parameters on the performance of different applications. If these geometrical parameters are not optimized for each application, they may have detrimental effects on their performance. These geometrical parameters in case of micro dimples include depth, diameter, depth to diameter ratio, shape and density of dimples. In this paper, the author reviews the effects of these geometrical parameters on the performance of two applications piston ring/cylinder assembly and mechanical seals.
76 citations
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TL;DR: In this article, the surface wettability on laser micro-circle-dimpled SiC surfaces was discussed and the morphology on the substrate was measured by the white-light interfering 3D profile meter, and the chemical composition was tested by the Energy Dispersive Spectrometer (EDS).
34 citations
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TL;DR: An analytical model is developed to predict the relation between the opening force and operating conditions in a mechanical seal with laser textured micro surface structure in the form of micropores.
Abstract: An analytical model is developed to predict the relation between the opening force and operating conditions in a mechanical seal with laser textured microsurface structure in the form of micropores The model is valid for any desired shape of the micropores An optimization is performed for spherical shape micropores evenly distributed on one of the mating rings face to maximize the opening force and fluid film stiffness Results of a parametric study are presented showing the effect of the main design parameters on the seal performance Some results of an experimental investigation with water-lubricated seal rings are also shown and compared with the theoretical model Presented as a Society of Tribologists and Lubrication Engineers paper at the ASME/STLE Tribology Conference in Toronto, Ontario, Canada, October 26–28, 1998
537 citations
TL;DR: The friction and wear behavior of boundary lubricated sliding surfaces is influenced by the surface texture as mentioned in this paper, by introducing controlled depressions and undulations in an otherwise flat surface, the...
500 citations
438 citations
TL;DR: In this paper, the effect of dimples on the Stribeck curve of a journal bearing with dimpled bushings has been investigated and a series of experimental results have been presented to examine the effect.
Abstract: The friction characteristic of a journal bearing with dimpled bushings manufactured using the machining and the chemical etching techniques is investigated. A series of experimental results is presented to examine the effect of dimples on the Stribeck curve. Load, oil type, dimple size, depth and shape are varied to explore their influence on the friction characteristics. It is shown that with proper dimensions of dimples, the friction performance of journal bearings can be improved, particularly for light oils. The results reveal that in mixed lubrication regime, the so-called secondary lubrication effect in the dimpled area is the main mechanism responsible for improvement of performance. Experimental results also indicate that a bushing with etched dimples over the entire circumference offer a better frictional performance than a bushing with dimples etched on half of its circumference.
226 citations
TL;DR: In this article, a surface texture pattern was designed to maximize the texture effect on the load carrying capacity of silicon carbide surfaces sliding in water, and the friction coefficient of such textured surface was evaluated and compared with that of untextured and those only with large or small dimples only.
224 citations