Quasi-Metamaterials: Quasicrystalline Mechnical Metamaterial Concepts for Advanced Engineering Application

准超材料：用于高级工程应用的准晶机械超材料概念

• 批准号: 2117888
• 金额: --
• 依托单位: CARDIFF UNIVERSITY
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2117888
• 关键词: Quasi; Metamaterials; Quasicrystalline; Mechnical; Metamaterial

EPSRC Research Portfolio areas: Continuum mechanics (grow), Structural Mechanics (maintain)Description:A microstructured quasicrystalline material is created combining basic unit cells with a lack of perfect periodicity. Quasicrystalline assemblies are a particular case or more general quasiperiodic ones. Recent research carried out by the team in Cardiff on one-dimensional quasicrystalline-based materials has shown that those structures display peculiar properties related to elastic wave propagation. In particular, the dynamic spectra of such waveguides (which reveal the capability of the structure to transmit waves at a given frequency) possess scaling and self-similarity features that can be exploited to design innovative metamaterials able to shield incoming elastic waves and mitigate unwanted vibrations. These features can be described with an elegant mathematical theory that is based on the existence of an invariant function called Kohmoto's invariant. The project will focus on the extension of the above preliminary findings to a fully two- and three-dimensional framework in order to provide guidelines for an effective design of innovative metamaterials based on a quasicrystalline (QC) microstructure. In particular, the following milestones will be pursued: i) identification of the invariants that oversee the dynamical properties of two- and three-D QC materials (1st year); ii) investigation of dispersion diagrams of QC materials and their scaling and self-similarity properties as an extension of what is known in one-dimensional structures (2nd year); iii) study of prototype devices to assess elastic wave attenuation at different frequencies (3rd year); iv) identification of design guidelines for the use of artificial QC-based metamaterials for engineering applications both in seismic and MEMS engineering (final six months).

描述：将缺乏完美周期性的基本单元胞结合在一起，创造出一种微结构准晶体材料。准晶组合是一种特殊情况或更一般的准周期组合。卡迪夫的研究小组最近对一维准晶体材料进行的研究表明，这些结构显示出与弹性波传播有关的特殊性质。特别是，这种波导的动态光谱（揭示了结构在给定频率下传输波的能力）具有缩放和自相似性特征，可以用于设计能够屏蔽传入弹性波并减轻不必要振动的创新超材料。这些特征可以用一个优雅的数学理论来描述，该理论基于一个称为Kohmoto不变量的不变函数的存在。该项目将专注于将上述初步发现扩展到完全二维和三维框架，以便为基于准晶（QC）微观结构的创新超材料的有效设计提供指导。特别是，将追求以下里程碑：i)确定监督二维和三维QC材料动态特性的不变量（第一年）；ii)调查QC材料的色散图及其缩放和自相似特性，作为已知一维结构的延伸（第二年）；Iii)评估不同频率下弹性波衰减的原型装置研究（第三年）；iv)确定用于地震和MEMS工程应用的人工qc超材料的设计指南（最后六个月）。