Dudek Krzysztof K, Attard Daphne, Gatt Ruben, Grima-Cornish James N, Grima Joseph N
Institute of Physics, University of Zielona Gora, ul. Szafrana 4a, 65-069 Zielona Gora, Poland.
Metamaterials Unit, Faculty of Science, University of Malta, MSD 2080 Msida, Malta.
Materials (Basel). 2020 May 10;13(9):2193. doi: 10.3390/ma13092193.
In this work, through the use of a theoretical model, we analyse the potential of a specific three-dimensional mechanical metamaterial composed of arrowhead-like structural units to exhibit a negative Poisson's ratio for an arbitrary loading direction. Said analysis allows us to assess its suitability for use in applications where materials must be able to respond in a desired manner to a stimulus applied in multiple directions. As a result of our studies, we show that the analysed system is capable of exhibiting auxetic behaviour for a broad range of loading directions, with isotropic behaviour being shown in some planes. In addition to that, we show that there are also certain loading directions in which the system manifests negative linear compressibility. This enhances its versatility and suitability for a number of applications where materials exhibiting auxetic behaviour or negative linear compressibility are normally implemented.
在这项工作中，我们通过使用理论模型，分析了一种由箭头状结构单元组成的特定三维机械超材料在任意加载方向上呈现负泊松比的潜力。上述分析使我们能够评估其在材料必须能够以期望方式响应多方向施加刺激的应用中的适用性。我们的研究结果表明，所分析的系统在广泛的加载方向上能够表现出拉胀行为，在某些平面上表现出各向同性行为。此外，我们还表明，在某些加载方向上，该系统表现出负线性压缩性。这增强了其通用性以及在通常采用具有拉胀行为或负线性压缩性材料的许多应用中的适用性。
