编织C/C复合材料复杂应力状态下力学性能劣化特性与机理研究

项目名称： 编织C/C复合材料复杂应力状态下力学性能劣化特性与机理研究

项目编号： No.11472092

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 数理科学和化学

项目作者： 许承海

作者单位： 哈尔滨工业大学

项目金额： 80万元

中文摘要： C/C复合材料作为非常关键的一类防热结构材料，主要服役于极端热物理化学和复杂应力环境。不同于其它先进复合材料，编织C/C材料力学性能对应力状态非常敏感，在不同应力状态下表现出显著劣化（或强化）特性和多样失效模式，严重影响C/C材料潜力的发挥和工程中合理应用。本项目从编织C/C复合材料的微/细观结构特征出发，建立引入非均匀、随机微结构的高保真度的材料力学分析模型，数值预报编织C/C材料不同应力状态下力学性能和失效模式。发展复杂应力状态试验技术，建立复杂应力状态材料力学性能参量 反演辨识方法，完成不同应力状态编织C/C材料力学行为试验研究；物理试验与数值仿真相结合给出应力耦合引起的材料强度、刚度等性能参量劣化规律及损伤演化规律，从微/细观层次揭示编织C/C材料复杂应力状态下的失效机理。本研究旨在为建立可靠的C/C材料力学性能测试与评价方法奠定理论基础，提高我国编织复合材料的设计与分析水平。

中文关键词： C/C复合材料；复杂载荷；力学性能劣化；反演辨识技术；失效机理

英文摘要： As a critical type of thermal protective structural materials, C/C composites mainly serve in the extreme heat physical chemistry and complex stress conditions. Unlike other advanced composite materials, mechanical properties of the woven C/C are very sensitive to stress state and show significant deterioration (or enhancement) of characteristics and diverse failure modes, which seriously affect the potential of C/C materials to play and its rational applications in engineering. This project starts from the micro/meso structural characteristics of woven C/C composites to build the high fidelity of material mechanical analysis model with introduction of non-uniform, random microstructure, and further to predict numerically the mechanical properties and failure modes of C/C materials under different stress states. The project develops testing technology under complex stress state, builds inversion identification methods of material mechanical properties under complex stress state, and achieves experimental research of woven C/C material mechanical behavior under different stress states; Also, the project gives material strength, stiffness and other performance parameters deteriorated law and the evolution from the coupling stress using the combination of physical tests and numerical simulation, and reveals the failure mechanism of the woven C/C materials under complex stress state from micro/meso level. This study aims to establish a reliable mechanical performance testing and evaluation methods of C/C material to lay the theoretical foundation and further to improve the design and analysis level of woven composites of our country.

英文关键词： carbon-carbon;biaxial load;mechanical properties;inversion identification;failure mechanism