Non-linear and dynamic behaviours of auxetic metamaterials (Ref: 4659)

增塑剂是具有独特机械性能的超材料。增减材料的泊松比为负，也就是说，与直觉相反，当拉伸时，它们横向膨胀，当压缩时，它们收缩。这种特性使其具有高吸收率以及增强的抗压痕和抗断裂性能。这些特性改善了声波/机械波吸收和冲击保护，因此在防弹衣、包装材料、减震装置和保护磨损等应用中具有很大的潜力。尽管在力学和机制方面的理解取得了重大进展，但对速率依赖和其他动态行为的理解仍然缺失。另一个方面是，由于材料固有的微观或宏观结构（例如再入蜂窝网络），当材料受到强振动环境时，已经观察到大量的非线性响应。该项目将研究增减材料的基本非线性和动态行为，旨在更清楚地了解其潜在的物理特性，从而提供可用于定制增减材料的工具，以提供所需的增强性能。这个项目的第二部分是研究生料的可制造性，特别是大规模生产的途径。利用ue工程实验室、成像套件和X-AT实验室的一系列设备，该项目还将探索促进这些材料大规模生产的新方法。

Auxetics are metamaterials with unique mechanical properties. Auxetic materials have a negative Poisson's ratio, that is, contra-intuitively when stretched they expand laterally and when compressed they shrink. This characteristic lends themselves properties such as high absorption of energy as well as enhanced indentation and fracture resistance. These properties improve acoustic/mechanical wave absorption and impact protection and therefore have great potential in applications such as body armour, packing materials, shock absorption devices and in protection wear. Despite paramount advancements in the understanding of the mechanics and mechanisms that produce the improved mechanical properties in auxetic materials, an equivalent understanding of rate-dependent and other dynamic behaviours is still missing. An additional aspect is that due to the micro or macrostructures inherent to auxetic materials (e.g. re-entrant honeycomb networks) substantial non-linear response has been observed when the material is subjected to strong vibration environments. This project will investigate the fundamental nonlinear and dynamic behaviour of auxetic materials aiming to deliver a clearer understanding of their underlying physics and so providing tools that can be used for tailoring auxetic materials to provide a desired enhanced performance. A second strand of this project is about investigating manufacturability of auxetic materials, in particular, avenues for mass production. Using a range of equipment at the UoE engineering laboratories, imaging suite and X-AT laboratories, this project will also explore new methods that would facilitate mass production of these materials.