Título

SURFACE TEXTURE DESIGN FOR DIFFERENT CIRCUMSTANCES

SURFACE TEXTURE DESIGN FOR DIFFERENT CIRCUMSTANCES

Autoria

Wang, Xiaolei; Yu, Haiwu; Huang, Wei

Wang, Xiaolei

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Yu, Haiwu

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Huang, Wei

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DOI

10.5151/5463-5463-17175

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Resumo

The appealing and enigmatic properties of biological surfaces inspire people that a smooth surface is not always the best. As an artificial surface texture, the cross hatch by honing process has been successfully used for cylinder liner since the 1940s. Currently, the patterns with micro-dimples are attracting more attentions since such closed texture cells are supposed to generate hydrodynamic pressure easier than micro-grooves. The advanced manufacturing techniques provide precision and freedom for the fabrication of surface texture, which makes it possible to obtain better tribological performances by the optimization of dimple geometry and distribution. Over the past decade, experiments were carried out to investigate the effects of micro-dimples on various surfaces including silicon carbide, metals, and elastomer, under high-speed low-load and low-speed high- load conditions, by water and oil lubrication. And numerical and analytical models based on Reynolds equation were used to evaluate the hydrodynamic effect generated between contacting surfaces in our group. As a summary, the results suggest the design of dimple pattern following hydrodynamic principle would obtain good tribological performance under high-speed low-load conditions, however, for the case of low-speed high-load conditions, shallow and small dimples have more obvious friction reduction effect than that designed based on hydrodynamic pressure generation.

The appealing and enigmatic properties of biological surfaces inspire people that a smooth surface is not always the best. As an artificial surface texture, the cross hatch by honing process has been successfully used for cylinder liner since the 1940s. Currently, the patterns with micro-dimples are attracting more attentions since such closed texture cells are supposed to generate hydrodynamic pressure easier than micro-grooves. The advanced manufacturing techniques provide precision and freedom for the fabrication of surface texture, which makes it possible to obtain better tribological performances by the optimization of dimple geometry and distribution. Over the past decade, experiments were carried out to investigate the effects of micro-dimples on various surfaces including silicon carbide, metals, and elastomer, under high-speed low-load and low-speed high- load conditions, by water and oil lubrication. And numerical and analytical models based on Reynolds equation were used to evaluate the hydrodynamic effect generated between contacting surfaces in our group. As a summary, the results suggest the design of dimple pattern following hydrodynamic principle would obtain good tribological performance under high-speed low-load conditions, however, for the case of low-speed high-load conditions, shallow and small dimples have more obvious friction reduction effect than that designed based on hydrodynamic pressure generation.

Palavras-chave

Surface texture; Sliding; Friction.

Surface texture; Sliding; Friction.