A glimpse of superb tribological designs in nature

Liu, Zheyu; Yin, Wei; Tao, Dashuai; Tian, Yu

doi:10.1016/j.biotri.2015.02.002

Cited by 34 publications

(21 citation statements)

References 154 publications

(135 reference statements)

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“…A detailed look into nature shows that it often makes use of multi-scale/hierarchical surfaces to optimize physical properties [8][9][10][11]. A well-studied phenomenon is the drag reduction observed for dolphins and sharks induced by their skin containing features of at least two different scales [12,13].…”

Section: Introductionmentioning

confidence: 99%

Multi-Scale Surface Texturing in Tribology—Current Knowledge and Future Perspectives

2019

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Surface texturing has been frequently used for tribological purposes in the last three decades due to its great potential to reduce friction and wear. Although biological systems advocate the use of hierarchical, multi-scale surface textures, most of the published experimental and numerical works have mainly addressed effects induced by single-scale surface textures. Therefore, it can be assumed that the potential of multi-scale surface texturing to further optimize friction and wear is underexplored. The aim of this review article is to shed some light on the current knowledge in the field of multi-scale surface textures applied to tribological systems from an experimental and numerical point of view. Initially, fabrication techniques with their respective advantages and disadvantages regarding the ability to create multi-scale surface textures are summarized. Afterwards, the existing state-of-the-art regarding experimental work performed to explore the potential, as well as the underlying effects of multi-scale textures under dry and lubricated conditions, is presented. Subsequently, numerical approaches to predict the behavior of multi-scale surface texturing under lubricated conditions are elucidated. Finally, the existing knowledge and hypotheses about the underlying driven mechanisms responsible for the improved tribological performance of multi-scale textures are summarized, and future trends in this research direction are emphasized.

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Section: Introductionmentioning

confidence: 99%

Multi-Scale Surface Texturing in Tribology—Current Knowledge and Future Perspectives

2019

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“…Fortunately, nature has always supplied inspirations to scholars. In the last decades, some researchers have made great efforts to address issues concerning the innovation in technology to be inspired by organisms in nature 3 – 7 . After millions of years of continuous adaption and evolution, bodies of creatures in nature have formed delicate biological surface structures with drag-reducing characteristics 8 – 11 .…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on drag-reduction characteristics of bionic surface with water-trapping microstructures of fish scales

Jiao

Song

et al. 2018

Sci Rep

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Biological surfaces with unique wettability in nature have provided an enormous innovation for scientists and engineers. More specifically, materials possessing various wetting properties have drawn considerable attention owing to their promising application prospects. Recently, great efforts have been concentrated on the researches on wetting-induced drag-reduction materials inspired by biology because of their ability to save energy. In this work, the drag-reduction characteristics of the bionic surface with delicate water-trapping microstructures of fish Ctenopharyngodon idellus scales were explored by experimental method. Firstly, the resistance of smooth surface and bionic surface experimental sample at different speeds was carefully tested through the testing system for operation resistance. Then, the contact angle (CA) of fish scale surface was measured by means of the contact angle measuring instrument. It was discovered that the bionic surface created a rewarding drag-reduction effect at a low speed, and the drag-reduction rate significantly displayed a downward trend with the increase in flow speed. Thus, when the rate was 0.66 m/s, the drag-reduction effect was at the optimum level, and the maximum drag reduction rate was 2.805%, which was in concordance with the simulated one. Furthermore, a contact angle (CA) of 11.5° appeared on the fish scale surface, exhibiting fine hydrophilic property. It further manifested the spreading-wetting phenomenon and the higher surface energy for the area of apical of fish scales, which played an important role in drag-reduction performance. This work will have a great potential in the engineering and transportation field.

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“…The cuticula or carapace of organisms with microstructure, such as pangolin, mole cricket, shell, shark, wood, and bamboo, has a great effect on the wear resistance properties. 27 Inspired by the microstructure on the dung beetle head, the drill with bionic structure is invented. 28 Based on the principle of bionic tribology, the micro-texture surface with large volumes could capture more wear debris and lubricant, which led to a longer wear life and better tribological properties.…”

Section: Resultsmentioning

confidence: 99%

Synergistic effects of surface strengthening and surface micro-texture on aviation spherical plain bearing tribological properties

Yuan

Qin

Денг

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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With an increase in extreme and complex work conditions in the fields of aircraft industry and high-speed train, single surface strengthening or single surface machining is not satisfactory with repeated requests of spherical plain bearings, which results in serious wear. Therefore, in this paper, a compound method of ultrasonic surface rolling process and surface texture was proposed on the basis of investigating the wear mechanism to meet the tribological property requirements of spherical plain bearings. The theoretical and experimental results show that low micro-hardness and low shear strength of surface material, rough surface, and poor lubrication are the important factors contributing to the wear of spherical plain bearings. The surface roughness Ra and Rz of processed spherical plain bearings are reduced to 0.02 mm and 0.14 mm from 0.35 mm and 2.1 mm, respectively, and the micro-hardness of surface material is increased by about 20%. The double-sine micro-textures with the width of 120 mm and the depth of 20 mm produced by laser machine, together with the circular groove, provide satisfactory lubrication for the spherical plain bearings. Finally, the wear resistance properties of spherical plain bearings were increased by more than 55%. The proposed synergistic methods have great advantages in improving the tribological properties of key fundamental components, especially for spherical plain bearings.

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A glimpse of superb tribological designs in nature

Cited by 34 publications

References 154 publications

Multi-Scale Surface Texturing in Tribology—Current Knowledge and Future Perspectives

Multi-Scale Surface Texturing in Tribology—Current Knowledge and Future Perspectives

Experimental investigations on drag-reduction characteristics of bionic surface with water-trapping microstructures of fish scales

Synergistic effects of surface strengthening and surface micro-texture on aviation spherical plain bearing tribological properties

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