The Biomimetic Shark Skin Optimization Design Method for Improving Lubrication Effect of Engineering Surface

Abstract

Nature has long been an important source of inspiration for mankind to develop artificial ways to mimic the remarkable properties of biological systems. In this work, a new method was explored to fabricate a biomimetic engineering surface comprising both the shark-skin, the shark body denticle, and rib morphology. It can help reduce water resistance and the friction contact area as well as accommodate lubricant. The lubrication theory model was established to predict the effect of geometric parameters of a biomimetic surface on tribological performance. The model has been proved to be feasible to predict tribological performance by the experimental results. The model was then used to investigate the effect of the grid textured surface on frictional performance of different geometries. The investigation was aimed at providing a rule for deriving the design parameters of a biomimetic surface with good lubrication characteristics. Results suggest that: (i) the increase in depression width ratio [Formula: see text] decreases its corresponding coefficient of friction, and (ii) the small coefficient of friction is achievable when [Formula: see text] is beyond 0.45. Superposition of depth ratio Γ and angle's couple under the condition of [Formula: see text] < 0.45 affects the value of friction coefficient. It shows the decrease in angle decreases with the increase in dimension depth [Formula: see text].

Biomimetic surface structuring using cylindrical vector femtosecond laser beams

“…Contrary to the, mostly applied to date, linear polarization case, dynamic surface processing with CV beams produces multi-directional rhombus-like structures exhibiting a radial or azimuthal directionality respectively. Such rhombus-like structures significantly mimic the placoid structures found in the skin of shark, although their characteristic size differs substantially from those comprising the shark skin [ 8,31,32 ].…”

“…In particular, laser processing with fs pulses offers advantages in minimizing thermal effects and collateral damage, allowing localized modifications with a large degree of control over the shape, size and the range of features that can be produced. Indeed, fs laser induced surface structuring has been demonstrated to produce numerous biomimetic structures [ [2][3][4][5] ] for a range of applications, including microfluidics [ 3,5,6 ], tribology [ [7][8][9] ], tissue engineering [ 2,10 ] and advanced optics [ 11 ].…”

Effect of microgrooves generated by machining on tribological properties of 20CrNiMo/ beryllium bronze tribopairs under low-speed and heavy-load conditions

“…For biomimetic surface based on shark skin texture, fluid film thickness and load-carrying capacity along with the leading angle effectively increased. 25 Additionally, dimensionless groove depth and width were found to have significant effect on friction reduction. Performance of microgrooves in reducing the friction coefficient and average temperature was optimized and found to be significantly improved in comparison to spherical texture on the bearing surface of journal bearing.…”

The Evolution of Self-Wrinkles in a Single-Layer Gradient Polymer Film Based on Viscoelasticity

“…41 In nature, wrinkles always form in continuous layered systems without an obvious interface in the systems. Meanwhile, these wrinkles are generated via inner stress from chemical and biological reactions or physical instability, such as plant growth, leaf blade morphology, 42 wrinkles on the skins of animals, 43,44 geographical features, and plate junctions. Hence, to fully comprehend and study the original mechanism of wrinkles, more attention should be given to wrinkles formed in the single-layer system, in which the inner factors are much closer to the wrinkles formed in nature.…”