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

拉胀超材料的非线性和动态行为（参考：4659）

• 批准号: 2859641
• 金额: --
• 依托单位: UNIVERSITY OF EXETER
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2859641
• 关键词: Non; linear; dynamic; behaviours; auxetic; Non; linear; dynamic; behaviours; auxetic

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.

配套是具有独特机械性能的超材料。辅助材料具有负泊松比，也就是说，在拉伸时，它们横向膨胀并在压缩时收缩。这种特征本身具有诸如高吸收能量以及增强的压痕和抗断裂性的特性。这些特性改善了声学/机械波的吸收和影响保护，因此在身体装甲，包装材料，减震装置和保护磨损等应用中具有巨大的潜力。尽管在理解辅助材料中产生改善的力学特性的力学和机制方面取得了重要的进步，但仍然缺少对速率依赖性和其他动态行为的等效理解。另一个方面是，由于辅助材料固有的微观或宏观结构（例如，重点蜂窝网络）在材料受到强烈振动环境时，已经观察到了实质性的非线性响应。该项目将研究旨在更清楚地了解其基本物理的辅助材料的基本非线性和动态行为，并提供可用于调整辅助材料以提供所需增强性能的工具。该项目的第二条是关于研究辅助材料的生产性，特别是大规模生产的途径。该项目使用UOE工程实验室，Imaging Suite和X-AT实验室的一系列设备，该项目还将探索新的方法，以促进这些材料的大规模生产。