Material with Tunable Constitution for Elastodynamic Deformation

具有可调节弹性动力变形结构的材料

• 批准号: 1538596
• 负责人: Mahmoud Hussein
• 金额: $ 36.49万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-15 至 2019-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1538596&HistoricalAwards=false
• 关键词: Material; Tunable; Constitution; Elastodynamic; Deformation

Structural composites are materials consisting of two or more constituent materials with different properties, that when combined, exhibit unique mechanical properties. The individual constituents can be chosen and arranged to achieve desirable properties, such as high stiffness and low density. In a conventional composite, however, these properties are constant and cannot be changed without permanently changing the structure or composition of the material. This award supports fundamental research to enable the analysis and design of a new class of composite materials that are tunable on-demand and on-the-fly. These tunable materials will feature internal networks of flow channels that allow active tuning of the density, elastic constants, and damping properties. The tunable composites enable fundamentally new strategies for the control of vibration and acoustics across a wide range of applications. This research combines several disciplines including elastodynamics, constitutive modeling, dynamic homogenization, fluid-structure interaction, band structure calculations, and design optimization. The multi-disciplinary nature of the research will provide a stimulating setting for students who will participate in this project and broaden participation of underrepresented groups in research. Outreach activities will attract K-12 students to the design of engineered materials with tunable properties and the underlying concepts pertaining to wave motion and mechanics of materials.The specific objectives of this project are to establish a rigorous dynamic homogenization theory for the tunable composites. The theory will account for the effects of dissipation on the composite properties. This theory will be used towards the analysis and design of fluidic metamaterials consisting of periodic arrays of resonators intertwined with a built-in network of flow channels with varying fluid composition and flow conditions. A topology optimization scheme will be established to maximize the real-time performance of the emerging fluid-structure material system. Building upon Bloch theory for harmonic wave propagation, the research on dynamic homogenization will establish a methodology for obtaining frequency-dependent effective properties for the density, damping, and elasticity tensors. A computational framework based on a finite-element time-domain scheme will be created for computing the band structure of the coupled fluid-structure system. A gradient-driven topology optimization methodology using level sets and the extended finite element method will be explored to optimally arrange fluid and solid phases. The resulting tunable metamaterial represents a major transformation to what constitutes a multi-functional composite that is intrinsically dynamic, adaptive, and energy absorbing, providing unprecedented new opportunities for sound and vibration control.

结构复合材料是由两种或两种以上具有不同性能的组成材料组成的材料，当它们结合在一起时，表现出独特的机械性能。可以选择和安排单个成分以获得所需的性能，例如高刚度和低密度。然而，在传统的复合材料中，这些特性是恒定的，除非永久改变材料的结构或组成，否则无法改变。该奖项支持基础研究，使分析和设计一种新型的可按需和动态调整的复合材料。这些可调材料将具有内部流动通道网络，允许主动调整密度，弹性常数和阻尼特性。这种可调复合材料在广泛的应用中为振动和声学控制提供了全新的策略。这项研究结合了几个学科，包括弹性动力学、本构建模、动力均匀化、流固耦合、带结构计算和设计优化。该研究的多学科性质将为参与该项目的学生提供一个刺激的环境，并扩大代表性不足的群体参与研究。外展活动将吸引K-12学生设计具有可调特性的工程材料，并了解与波动和材料力学相关的基本概念。本项目的具体目标是为可调复合材料建立一个严格的动态均匀化理论。该理论将解释耗散对复合材料性能的影响。该理论将用于分析和设计流体超材料，这些超材料由周期性谐振器阵列与具有不同流体成分和流动条件的内置流动通道网络交织在一起组成。建立一种拓扑优化方案，以最大限度地提高新兴流固材料系统的实时性。基于谐波传播的布洛赫理论，动态均匀化研究将建立一种方法来获得密度、阻尼和弹性张量的频率相关有效特性。建立了基于有限元时域格式的计算框架，用于计算流固耦合系统的带结构。一个梯度驱动的拓扑优化方法使用水平集和扩展的有限元方法将探索优化安排流体和固体相。由此产生的可调超材料代表了构成多功能复合材料的重大转变，该复合材料具有内在的动态、自适应和能量吸收，为声音和振动控制提供了前所未有的新机会。