Study of electromechanical metamaterial systems

机电耦合智能压电系统是一种结构紧凑、灵敏、耐用、能实时响应环境刺激的智能压电系统，受到了工程界和学术界的广泛关注。由于其优越于传统结构的先进功能，这些智能压电结构的应用被广泛地扩展到各个领域。探索、开发和开发智能技术新产品的竞赛一直在进行，这为相关行业提供了新的机遇，但也对保持竞争力提出了挑战。制造技术的进步使新型智能结构的发展成为可能，这些结构以高密度嵌入传感、驱动和通信。这种嵌入可以如此紧密，以至于结构和材料之间的区别变得模糊，因此这些智能结构可以被等同于新的智能材料。这些进展还使得设计智能系统的详细局部结构成为可能。*本项目的目标是开发由周期性排列的特殊设计材料单元组成的新型集成压电智能材料系统。智能材料的机电性能将由材料单元的性质和材料的周期结构共同决定。与传统复合材料不同，传统复合材料的所需性能，如更高的刚度和强度，是通过利用单个组件的最佳性能来实现的，新型智能材料的机电性能不仅取决于材料组成，而且更重要的是，通过材料单元局部结构的详细几何设计来调整。*理论研究将集中在(I)能够描述所设计的局部材料单元的复杂机电行为的力学模型的发展，(Ii)优化局部材料单元的设计以获得先进的或奇异的机电性能(超材料)，(Iii)将局部单元集成到周期性结构中以形成所需的智能材料，(Iv)新智能材料的机电性能的表征和评估，以及(V)智能材料的失效条件的评估。这项实验研究将基于传统制造技术和/或加法制造来构建和评估新型智能材料的性能。在短期内，目前的研究将为如何设计具有常规无法获得的新性能的先进的压电智能材料提供新的思路和指导方针。从长远来看，目前的研究成果可以用于下一代可编程智能材料的设计，这种材料可以很容易地控制和交流。**

The development of electromechanically coupled smart piezoelectric systems, which can respond to environment stimuli in real time and are compact, sensitive and durable has received considerable attention from research and industrial communities in engineering. Because of their advanced functionalities superior to the convectional structures the applications of these smart piezoelectric structures are widely spread into diverse areas. The race is always on to explore, develop and exploit new products of smart technology, which provides new opportunities for the associated industries, but also impose challenges for keeping to be competitive. The advances in manufacturing techniques have enabled the development of new classes of smart structures that embed sensing, actuation and communication at high densities. This embedding can be so tight that the distinction between structure and materials blur so these smart structures can be considered equivalently as new smart materials. These advances also make it possible to design the detailed local structures of the smart systems.******It is the objective of the current project to develop new integrated piezoelectric smart material systems, which consist of periodically arranged specially designed material cells. The electromechanical properties of the smart material will be dominated by both the property of the material cells and also the periodic structure of the material. Different from traditional composite materials for which the desired properties, such as higher stiffness and strength, come from utilizing the best' properties of the individual constituents, the electromechanical properties of the new smart materials are tailored not only by material composition but also, and more importantly, by the detailed geometrical design of the local structure of the material cells. ******The theoretical study will be focused on (i) the development of mechanical models capable of describing the complicated electromechanical behaviour of the designed local material cells, (ii) the design of local material cell optimized to achieve advanced or exotic electromechanical properties (metamaterials), (iii) the integration of the local cells into periodic structures to form the desired smart materials, (iv) the characterization and evaluation of the electromechanical properties of the new smart materials, and (v) the evaluation of failure conditions of the smart materials. The experimental study will be conducted to build and evaluate the properties of the new smart materials based on traditional manufacturing techniques and/or additive manufacturing. In the short term, the current research will provide new ideas and guidelines on how to design advanced piezoelectric smart materials with new properties not available conventionally. In the long term, the outcome of the current research could be used in the design of the next generation programmable smart materials, which can be easily controlled and communicated with.**