Mechanical metamaterials are systems which derive their mechanical properties from their structure rather than their intrinsic material composition. In this work, we investigate a class of highly anisotropic mechanical metamaterials designed by the introduction of diamond and elliptically shaped perforations which possess the ability to show auxetic behaviour. By the use of finite element simulations, we show how these highly tuneable systems have the potential to exhibit a large range of Poisson’s ratios, ranging from highly positive to giant negative values, simply by altering the geometric parameters and orientation of the perforations. The anomalous properties of these systems have also been shown to be retained over significant tensile strain ranges, highlighting the vast potential applicability and functionality of these mechanical metamaterials.

机械超材料是从其结构而不是其固有材料组成中获得其机械性能的系统。在这项工作中，我们研究了通过引入金刚石和椭圆形穿孔而设计的一类高度各向异性的机械超材料，这些穿孔具有显示膨胀行为的能力。通过使用有限元模拟，我们展示了这些高度可调节的系统如何简单地通过改变几何参数和孔眼的方向来展现大范围的泊松比，从高正值到巨大的负值。这些系统的异常特性也已显示在相当大的拉伸应变范围内得以保持，