Dudek Krzysztof K, Gatt Ruben, Dudek Miroslaw R, 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, Msida, MSD 2080, Malta.
Materials (Basel). 2021 Feb 5;14(4):758. doi: 10.3390/ma14040758.
In this work, we use computer simulations (Molecular Dynamics) to analyse the behaviour of a specific auxetic hierarchical mechanical metamaterial composed of square-like elements. We show that, depending on the design of hinges connecting structural elements, the system can exhibit a controllable behaviour where different hierarchical levels can deform to the desired extent. We also show that the use of different hinges within the same structure can enhance the control over its deformation and mechanical properties, whose results can be applied to other mechanical metamaterials. In addition, we analyse the effect of the size of the system as well as the variation in the stiffness of its hinges on the range of the exhibited auxetic behaviour (negative Poisson's ratio). Finally, it is discussed that the concept presented in this work can be used amongst others in the design of highly efficient protective devices capable of adjusting their response to a specific application.
在这项工作中，我们使用计算机模拟（分子动力学）来分析一种由类方形单元组成的特定负泊松比分层机械超材料的行为。我们表明，根据连接结构单元的铰链设计，系统可以呈现出可控行为，其中不同的分层级别可以变形到所需程度。我们还表明，在同一结构中使用不同的铰链可以增强对其变形和力学性能的控制，其结果可应用于其他机械超材料。此外，我们分析了系统尺寸以及其铰链刚度变化对所呈现的负泊松比行为范围的影响。最后，讨论了这项工作中提出的概念可用于设计能够针对特定应用调整其响应的高效保护装置等。
