Optimal Design of High-Aspect-Ratio Micro/Nano Hierarchical Structures Mimicking Gecko Foot-Hairs
Optimal Design of High-Aspect-Ratio Micro/Nano Hierarchical Structures Mimicking Gecko Foot-Hairs
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DOI：
10.1166/asl.2011.1567
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发表时间：
2011-04
影响因子：
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通讯作者：
Shiyuan Liu;Peng Zhang;Xue Cheng;R. Malik;Zirong Tang
中科院分区：
文献类型：
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作者：
Shiyuan Liu;Peng Zhang;Xue Cheng;R. Malik;Zirong Tang
壁虎具有非凡的攀爬能力。壁虎足毛的多尺度层次结构，特别是微米级刚毛和纳米级铲状结构的高纵横比结构，是壁虎能够以强大的附着力吸附和粘附任何不同表面的关键因素。本文通过模拟壁虎的附着，提出了强附着力、易脱离、粗糙表面适应、抗聚束和抗断裂等一系列模型。基于这些模型，我们推出了一种自下而上的方法来设计模仿壁虎干胶垫的高纵横比分层结构。这里还开发了一种巧妙的程序，通过多目标优化找出最佳参数，包括分层结构尺寸、纤维的密度和图案以及单纤维的几何参数。结果表明，结构的最佳设计参数与观察到的壁虎参数相似。特别是该结构的模拟附着力与单根刚毛的测量值一致，证明优化后的结构也具有像壁虎一样强大的附着能力。
Geckos have extraordinary climbing ability. The multi-scale hierarchical structure of the gecko foot-hairs, especially the high-aspect-ratio structure of its micro-scale seta and nano-scale spatulae is the critical factor of the gecko’s ability to adopt and stick to any different surface with powerful adhesion force. In this paper, a series of models such as robust adhesion, easy detachment, rough surface adaption, anti-bunching and anti-fracture, have been proposed by simulating gecko’s attachment. Based on these models, we have launched a bottomup methodology for designing the high-aspect-ratio hierarchical structure mimicking gecko’s dry adhesive pad. A skillful procedure is also developed here to find out optimum parameters by multi-object optimization, including the hierarchical structural dimensions, the density and pattern of the fibers, and the geometric parameters of the single fiber. The outcome illustrates that the optimal designed parameters of the structure are analogous to those of geckos observed. Especially, the simulated adhesion force of the structure is consistent with the measured value of a single seta, which proves that the optimized structure also has powerful adhesive ability like geckos.