A novel cellular mechanical metamaterial called Fish Cells that exhibits zero Poisson’s ratio in both orthogonal in-plane directions is proposed. Homogenization study on the Fish Cells tessellation is conducted and substantially zero Poisson’s ratio behavior in a homogenized tessellation is shown by numerical analysis. Experimental investigations are performed to validate the zero Poisson’s ratio feature of the metamaterial and obtain force–displacement response of the metamaterial in elastic and plastic zone. A detailed discussion about the effect of the numerical model approach and joints on the structural response of the metamaterial is presented. Morphing skin is a potential application for Fish Cells metamaterial because of the integration benefits of zero Poisson’s ratio design. The structural integrity of the Fish Cells is investigated by studying the stiffness augmentation under tension and in presence of constraints on transverse edges. Finally, geometrical enhancements for improved integrity of the Fish Cells are presented that result in substantially zero stiffness augmentation required for morphing skins.

中文翻译：

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鱼细胞，一种新的零泊松比超材料——第一部分：设计和实验

提出了一种称为鱼细胞的新型细胞机械超材料，其在两个正交的面内方向上均表现出零泊松比。对鱼细胞镶嵌进行了均质化研究，并通过数值分析显示了均质镶嵌中的泊松比行为基本上为零。进行实验研究以验证超材料的零泊松比特征，并获得超材料在弹性和塑性区的力-位移响应。详细讨论了数值模型方法和接头对超材料结构响应的影响。由于零泊松比设计的集成优势，变形皮肤是鱼细胞超材料的潜在应用。通过研究在张力和横向边缘存在约束条件下的刚度增加来研究鱼细胞的结构完整性。最后，提出了用于改善鱼细胞完整性的几何增强，导致变形蒙皮所需的刚度增加基本上为零。