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Reversible Attachment with Tailored Permeability: The Feather Vane and Bioinspired Designs

机译：具有可调节的渗透性的可逆附件：羽状叶片和生物启发性设计

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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 mu m 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.
机译：在鸟类飞行中，机翼的大部分表面由高度精练和层次分明的羽毛组成。它们由源自羽杆的倒钩和由倒钩分支的倒钩组成，形成坚硬的羽状叶片。叶片通过互锁的钩-槽机制在叶片内提供附着力，以有效捕获空气。如果结构彼此不固定，这种功能性粘合剂可以重新附着，从而防止叶片遭受灾难性损坏。在这里，以鹈鹕原生羽毛为模型材料，我们研究了平面内的附着力和小球的刚度。通过使用珍珠鸡，鹈鹕和鸽子羽毛，我们可以确定小肠对羽毛叶片捕捉空气的能力的影响。发现叶片具有方向渗透性，并且确定将叶片分离出来对羽毛的能力的影响取决于叶片的尺寸。有趣的是，发现重达4至11000 g（蜂鸟到秃鹰）的家禽的小球间距在8-16微米的狭窄范围内变化。此外，通过增材制造来制造具有生物启发性的小球，以研究叶片的复杂性。气球是飞行中羽毛的柔韧性必不可少的未开发结构，具有提供生物启发的航空航天材料的潜力。

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