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

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.

营养是一种具有独特力学性质的超材料。拉伸材料的泊松比为负值，也就是说，与直觉相反，拉伸时它们横向膨胀，压缩时它们收缩。这一特性赋予了它们自身的特性，如高吸收能量以及增强的压痕和抗断裂性能。这些性能改善了声波/机械波吸收和冲击防护，因此在防弹衣、包装材料、减震装置和防护磨损等方面具有巨大的应用潜力。尽管在理解产生伸展材料力学性能改善的力学和机制方面取得了重大进展，但对速率依赖和其他动态行为的等同理解仍然缺乏。另一个方面是，由于伸展材料固有的微观或宏观结构(例如，可再入蜂窝网络)，当材料受到强烈振动环境时，观察到显著的非线性响应。该项目将研究伸展材料的基本非线性和动态行为，旨在更清楚地了解其基本物理，从而提供可用于定制伸展材料的工具，以提供所需的增强性能。这个项目的第二部分是关于研究可加工材料的可制造性，特别是大规模生产的途径。该项目还将利用UOE工程实验室、成像套件和X-AT实验室的一系列设备，探索促进这些材料大规模生产的新方法。