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Anisotropic dry adhesive via cap defects

机译：通过帽缺陷的各向异性干胶

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摘要

We demonstrate how introducing a deliberate defect on the overhanging caps of strongly adhering mushroom shaped dry adhesive fibers can produce directional adhesion behavior. We find that the shape and location of this defect controls both the total adhesion force and the degree of directionality for these bio-inspired adhesives. Linear beam theory is used to demonstrate how the application of a shear load to a fiber in tension can create a small compressive load to an asymmetric crack, thereby delaying adhesion failure and producing directional adhesion, and the theory is confirmed with finite element models and empirical data. Anisotropic adhesives have been fabricated and tested and can demonstrate normal adhesion force up to ～250 kPa with a shear displacement of 15 μm away from the defect and as small as ～5 kPa when sheared the same amount towards the defect.
机译：我们演示了如何在强粘性蘑菇形干粘合纤维的伸出帽上引入故意的缺陷，从而产生定向粘合行为。我们发现该缺陷的形状和位置控制了这些生物启发型粘合剂的总粘合力和方向性。线性梁理论被用来证明在张力下对纤维施加剪切载荷如何对不对称裂纹产生较小的压缩载荷，从而延迟粘合失败并产生定向粘合，并且该理论已通过有限元模型和经验得到证实。数据。各向异性粘合剂已经被制造和测试，可以显示出高达〜250 kPa的正常粘附力，并且距缺陷处的剪切位移为15μm，当向缺陷处剪切相同量的粘合剂时，剪切粘附力可低至〜5 kPa。

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