阻尼是影响结构动力学性能的关键因素。项目从碳纳米管/树脂基复合材料微观组织-细观构型-宏观性能多层面入手，解构其阻尼形成机理，探讨其多尺度设计方法。基于碳纳米管/树脂基微观组织的分子动力学行为分析，认知和解析其能量传导与耗散机制；基于考虑尺寸效应的非经典连续力学、粘弹性阻尼模型和多相材料等效理论，构建计及不同耗能的微观代表体积元模型，识别尺寸效应参数、力学性能参数，揭示碳纳米管/树脂基微观组织和细观构型变化对材料阻尼特性的影响机制；利用多尺度等效方法，建立碳纳米管/树脂基复合材料微观组织、细观构型和性能演化多尺度数字化模型，实现其微观组织-细观构型-宏观性能之间的定量预测及调配。研究碳纳米管/树脂基复合材料结构的多尺度最优调配设计，开发碳纳米管复合材料结构的微观组织-细观构型-宏观尺寸的多尺度设计原型系统，实现具有工程需求的高刚度高阻尼最优动特性的碳纳米管/树脂基复合材料结构的多尺度设计。

Damping plays a significant role in the dynamic performance of structural systems. The project is focused on the microstructure, mesoscopic configuration and macrostructural performance of carbon nanotubes (CNT)/resin-matrix composite materials, studies its damping mechanism and investigates its multiscale design method. The mechanism of energy dissipation of the microstructure of CNT/resin-matrix composite will be analyzed based on molecular dynamics simulation. By using size-dependent non-classical continuum theories, viscoelastic damping models and multiphase equivalent theorem, some representative volume elements (RVE) involving different level of energy dissipation will be established and their size-dependent parameters and mechanical parameters will be identified. The damping mechanism of CNT/resin-matrix composite on the evolution of microstructure and mesoscopic configuration will be revealed by using the multiscale finite element method (FEM). By considering the size-dependent effect of microstructure and using the multiscale FEM, the multiscale digital model will be established to predict the dynamic performance of CNT/resin-matrix composite structures on the evolution of their microstructures and mesoscopic configurations. Finally, a design software will be developed to implement the multiscale design method, and will be useful for the potential designs and applications of high viscoelastic damping and high stiffness structures made of CNT/resin-matrix composite materials.