辅助
泊松比
超材料
泊松分布
运动学
模数
材料科学
铰链
蜂巢
多面体
蜂窝结构
有限元法
常量(计算机编程)
压缩(物理)
工作(物理)
几何学
结构工程
拓扑(电路)
复合材料
计算机科学
数学
物理
机械工程
经典力学
工程类
组合数学
统计
光电子学
程序设计语言
作者
Andrea Sorrentino,Davide Castagnetti
标识
DOI:10.1088/1361-665x/acb3a3
摘要
Abstract The work presents a novel polyhedral mechanical metamaterial based on rotating triangular prisms connected by their corners, which possesses the ability to attain large values of negative Poisson’s ratio (NPR). Through a kinematic model of the proposed rotating structure, we evaluate the auxeticity of the system by varying the geometrical parameters of the polyhedrons composing the elementary cell of the structure. The kinematic results highlight the peculiar NPR of the system, whose values are nearly constant over significant strain ranges. Focusing on the most promising auxetic mechanisms we designed chiral architectures that replace the ideal hinges at the corners with curved-shape ligaments, and validated these configurations through three-dimensional printed specimens. The specimens were tested under uniaxial compression and simulated through finite element analyses. Experimental results exhibited an excellent agreement with computational predictions in terms of elastic modulus and auxeticity, showing a value of Poisson’s ratio up to −1.3 for one of the designs. Our findings demonstrate the highly auxetic property of rotating polyhedral systems, which allow the design of novel architected materials useful, for example, in biomechanical applications.
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