Hierarchical Surface Patterns via Global Wrinkling on Curved Substrate for Fluid Drag Control,Advanced Materials Interfaces

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Hierarchical Surface Patterns via Global Wrinkling on Curved Substrate for Fluid Drag Control
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2020-11-16 , DOI: 10.1002/admi.202001489
Gaojian Lin ₁ , Jiaqi Li ₁ , Zhao Xu ₂ , Dengteng Ge ₂ , Weifu Sun _{1,

3} , Pengwan Chen ₁

Affiliation

In this paper, the results of an investigation on the global wrinkling of stiff coatings resting on curved compliant substrates are presented. It is found that the overall stiffness of the corrugated coatings can dominate the deformation mode and induce the global wrinkling when the coating thickness exceeds certain critical value. It is demonstrated that hierarchical wrinkling patterns with small wrinkles superposing on large wrinkles, either parallel or perpendicularly, can be generated via the global wrinkling processes. Through a combination of theoretical model, experimental studies, and numerical simulations, the formation mechanism and controlling parameters of the hierarchical wrinkling patterns are systematically investigated. The quantitative expression of the critical loading strain, critical wavelength, and critical coating thickness of the global wrinkling as a function of the initial substrate curvatures and loading conditions are revealed. Inspired by the resemblance between the hierarchical surface patterns and the surface riblets on sharks and dolphins, the potential application of utilizing the hierarchical wrinkling patterns to reduce fluid drag through computational fluid dynamics (CFD) studies is further investigated. Reduced drag resistance is observed on the hierarchical wrinkled surface with small wrinkles and large wrinkles perpendicular to each other.

中文翻译：

通过整体起皱在弯曲基板上的分层表面图案以控制流体

在本文中，提出了对弯曲顺应性基材上的硬质涂层整体起皱的研究结果。发现当涂层厚度超过一定临界值时，波纹涂层的整体刚度可支配变形模式并引起整体起皱。结果表明，可以通过整体起皱过程生成具有平行或垂直于大皱纹的小皱纹的分层起皱图案。通过理论模型，实验研究和数值模拟相结合，系统地研究了分层皱纹的形成机理和控制参数。临界载荷应变，临界波长，揭示了整体起皱的临界涂层厚度与初始基材曲率和加载条件的关系。受鲨鱼和海豚上的分层表面样式与表面肋骨之间相似性的启发，通过计算流体动力学（CFD）研究，进一步研究了利用分层起皱样式来减少流体阻力的潜在应用。在具有小皱纹和彼此垂直的大皱纹的分层皱纹表面上观察到阻力减小了。通过计算流体动力学（CFD）研究，进一步研究了利用分层起皱模式来减少流体阻力的潜在应用。在具有小皱纹和彼此垂直的大皱纹的分层皱纹表面上观察到阻力减小了。通过计算流体动力学（CFD）研究，进一步研究了利用分层起皱模式来减少流体阻力的潜在应用。在具有小皱纹和彼此垂直的大皱纹的分层皱纹表面上观察到阻力减小了。

更新日期：2021-01-12

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