Reversible Attachment with Tailored Permeability: The Feather Vane and Bioinspired Designs
Reversible Attachment with Tailored Permeability: The Feather Vane and Bioinspired Designs
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DOI：
10.1002/adfm.201702954
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发表时间：
2017-08
影响因子：
19
通讯作者：
Tarah N. Sullivan;M. Chon;Rajaprakash Ramachandramoorthy;Michael R. Roenbeck;Tzu‐Tying Hung;H. Espinosa;M. Meyers
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文献类型：
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作者：
Tarah N. Sullivan;M. Chon;Rajaprakash Ramachandramoorthy;Michael R. Roenbeck;Tzu‐Tying Hung;H. Espinosa;M. Meyers
在鸟类飞行中，翅膀表面的大部分由高度精细和层次组织的羽毛组成。它们由羽柄上的羽倒钩和羽倒钩分支的羽管组成，形成坚硬的羽片。通过互锁钩槽机制，短须在叶片内提供粘附力，以便有效捕获空气。如果结构彼此松开，这种功能性粘合剂可以重新附着，防止叶片的灾难性损坏。在这里，使用派力肯初级羽毛作为模型材料，我们调查的面内粘附和刚度的羽毛。用珍珠鸡、派力肯和鸽子的羽毛，我们确定了羽毛对羽片捕获空气能力的影响。叶片被发现具有定向渗透性，和分离的羽毛上的能力的影响被确定为倒钩尺寸的函数。有趣的是，对于体重从4-11 000 g（蜂鸟到秃鹰）的鸟类，发现羽枝间距在8-16 µm的狭窄范围内变化。此外，通过增材制造来制造生物启发的微结构，以研究叶片的复杂性。羽须是一种尚未被充分研究的结构，它对羽毛在飞行中的熟练程度至关重要，有可能提供生物启发的航空航天材料。
In bird flight, the majority of the wing surface consists of highly refined and hierarchically organized feathers. They are composed of barbs that stem from the feather shaft and barbules that branch from barbs, forming a rigid feather vane. Barbules provide adhesion within the vane through an interlocking hook‐and‐groove mechanism to allow for the effective capture of air. This functional adhesive can reattach if structures unfasten from one another, preventing catastrophic damage of the vane. Here, using pelican primary feathers as a model material, we investigate the in‐plane adhesion and stiffness of barbules. With guineafowl, pelican, and dove feathers, we determine the effect of barbules on the feather vane's ability to capture air. The vane is found to have directional permeability, and the effect of detaching barbules on the feather's competency is determined to be a function of barb dimensions. Interestingly, barbule spacing is found to vary within a narrow 8–16 µm range for birds weighing from 4–11 000 g (hummingbird to condor). Additionally, bioinspired barbules are fabricated through additive manufacturing to study the complexities of the vane. Barbules are underexplored structures imperative to the adeptness of the feather in flight, with the potential to provide bioinspired aerospace materials.