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Morphing hybrid honeycomb (MOHYCOMB) with in situ Poisson's ratio modulation

机译：利用原位泊松比调制变形混合蜂窝（MOHYCOMB）

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摘要

Electrostatic adhesion can be used as a means of reversible attachment. Through application of high voltage (similar to 2 kV) across closely spaced parallel plate electrodes, significant shear stresses (11 kPa) can be generated. The highest levels of electrostatic holding force can be achieved through close contact of connection surfaces; this is facilitated by flexible electrodes which can conform to reduce air gaps. Cellular structures are comprised of thin walled elements, making them ideal host structures for electrostatic adhesive elements. The reversible adhesion provides control of the internal connectivity of the cellular structure, and determines the effective cell geometry. This would offer variable stiffness and control of the effective Poisson's ratio of the global cellular array. Using copper-polyimide thin film laminates and PVDF thin film dielectrics, double lap shear electrostatic adhesive elements have been introduced to a cellular geometry. By activating different groups of reversible adhesive interfaces, the cellular array can assume four different cell configurations. A maximum stiffness modulation of 450% between the ` All off' and ` All on' cell morphologies has been demonstrated. This structure is also capable of in situ effective Poisson's ratio variations, with the ability to switch between values of -0.45 and 0.54. Such a structure offers the potential for tuneable vibration absorption (due to its variable stiffness properties), or as a smart honeycomb with controllable curvature and is termed morphing hybrid honeycomb.
机译：静电粘附可以用作可逆附着的手段。通过在相距很近的平行平板电极上施加高电压（约2 kV），可以产生明显的切应力（11 kPa）。可以通过紧密接触连接表面来获得最高水平的静电保持力。柔性电极有助于减少气隙，这有助于实现这一点。蜂窝结构由薄壁元件组成，使其成为静电粘合元件的理想宿主结构。可逆的粘附力可控制细胞结构的内部连通性，并确定有效的细胞几何形状。这将提供可变的刚度并控制整体细胞阵列的有效泊松比。使用铜-聚酰亚胺薄膜层压板和PVDF薄膜电介质，双搭接剪切静电粘合元件已被引入到单元几何中。通过激活不同组的可逆粘合剂界面，蜂窝阵列可以采用四种不同的蜂窝配置。已经证明“全开”和“全开”细胞形态之间的最大刚度调制为450％。这种结构还能够在原位有效的泊松比变化，并且能够在-0.45和0.54的值之间切换。这种结构（由于其可变的刚度特性）可提供可调节的振动吸收潜力，或作为具有可控曲率的智能蜂窝，被称为变形混合蜂窝。

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