考虑场相关界面效应的低维功能复合材料多场耦合等效行为研究

Multi-field coupling effective properties of low-dimension functionalized composites under strain, temperature and AC electro-magnetic loadings are very important and difficult in the energy and aerospace industry, which is in the crossing fields of mechanics, material science, thermology and electromagnetism. Loading-dependent interface effects between the functionalized material and the matrix have great influences on the multi-field coupling effective properties of overall composites. The present project aims to systematically establish the micromechanics-based models on field-dependent interface effects and multi-field coupling effective properties of low-dimension functionalized composites through theoretical modelling, numerical simulation and experimental validation: (1) Establish models on loading-dependent interface effects to explore the mechanism of multi-field coupling phenomena; (2) Obtain the multi-field coupling effective properties to explain the connection between micromechanics-based parameters and overall behaviors; (3) Explore the tuning on the effective properties of low-dimension functionalized composites by micromechanics-based properties and external loadings. Finally, the multi-scale analysis method will be achieved on the multi-field coupling effective properties of low-dimension functionalized composites. The new method can provide a novel and micromechanics-based tool for the design and practical applications of low-dimension functionalized composites.

低维功能复合材料在应变、温度和交流电磁载荷作用下的多场耦合等效行为是目前新型能源与航空航天领域的研究热点与难点，涉及力学、材料学、热学和电磁学的交叉学科。研究低维功能材料与基质材料间场相关界面效应的机理是揭示复合材料整体多场耦合行为的关键。本项目拟针对低维功能复合材料的均值化问题，通过理论建模、数值模拟以及实验验证等研究手段，开展场相关界面效应及多场耦合等效行为的研究：（1）建立外加载荷场相关的界面效应模型，从微观结构揭示其多场耦合现象的内在机理；（2）建立考虑场相关界面效应的电-磁-热-弹多场耦合等效行为理论，阐述微观参数和外加载荷与宏观多场耦合行为间的联系；（3）探究低维功能复合材料多场耦合宏观性能的调控规律，为其优化设计提供理论保障。最终发展低维功能复合材料多场耦合等效性质的宏细观分析方法，为材料的实际应用提供理论和技术支撑。

低维功能复合材料在多场载荷作用下的均匀化分析是新型能源与航空航天领域的研究热点与难点。揭示低维功能材料与基质材料间场相关界面效应的机理是探究低维功能复合材料多场耦合行为的关键。本项目基于低维功能复合材料均值化问题以及元器件优化设计的实际需求，通过理论建模、数值模拟以及实验验证等研究手段，开展了场相关界面效应及多场耦合等效行为的研究：建立了低维功能复合材料温度相关电磁和力学特性本构理论，从微观结构揭示了其多场耦合等效导电性及粘弹性变形与恢复行为的内在机理；构建了低维功能复合材料应变传感器敏感系数力电耦合计算模型，为直流、交流、拉伸及压缩等不同工况下传感器参数设计提供了理论依据；提出了低维多孔功能复合材料电磁特性多目标优化方法，探究了材料微观参数对复合材料等效功能行为的调控规律；开展了低维功能复合材料电磁屏蔽实验，建立了电磁屏蔽效能实验数据集。最终发展了低维功能复合材料多场耦合等效功能及力学行为的宏细观分析方法，为复合材料的实际应用提供理论和技术支撑。依托本项目，共申请相关的国家发明专利4项，发表SCI论文25篇，包括Int J Plasticity、Compos Sci Tech、Int J Eng Sci、Mater Design、Mech Mater等期刊。