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Design and characterization of axisymmetric auxetic metamaterials

机译：轴对称辅助超材料的设计与鉴定

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Traditional three dimensional (3D) block auxetics exhibit anisotropic cross-section changes even they exist in isotropic forms due to finite size and boundary effect. Herein, a systematic design strategy of axisymmetric aux-etic metamaterials is proposed with rotationally symmetric transverse deformation mode. The axisymmetric auxetics are obtained by the revolution of two-dimensional curved auxetic configurations along the axis of rota-tion and composed with shell elements. Finite element simulations and mechanical experiments reveal that the axisymmetric deformation mechanism cause transversely isotropic negative Poisson's ratio and enhance the specific Young's modulus compared to corresponding 2D and 3D cellular structures. The influence of geometric parameters on elastic constants is investigated numerically. Three kinds of 3D printing technologies are adopted to fabricate the axisymmetric auxetics which shows the relative Young's modulus and equivalent Poisson's ratio are independent of constitute materials. This study systematically characterizes the mechanical responses of axisymmetric auxetic metamaterials and expounds the potential multifunctional applications, such as reusable energy absorption.
机译：传统的三维（3D）块辅助表现出各向异性横截面变化，即使它们存在于各向同性形式，由于有限尺寸和边界效应。这里，提出了一种具有旋转对称横向变形模式的轴对称辅测超材料的系统设计策略。轴对称辅助通过沿旋转轴线的二维弯曲辅助配置的旋转获得，并与壳体元件组成。有限元模拟和机械实验表明，与相应的2D和3D蜂窝结构相比，轴对称变形机制导致横向各向同性负泊松比率，增强特定杨氏模量。数值研究了几何参数对弹性常数的影响。采用三种3D印刷技术来制造轴对称辅助，显示相对杨氏模量和等效泊松比的轴质辅助与构成材料的比例无关。本研究系统地表征了轴对称扶手超材料的机械响应，并阐述了潜在的多功能应用，例如可重复使用的能量吸收。

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