超高温陶瓷材料的热－力－氧耦合渐进损伤与失效机理研究

项目名称： 超高温陶瓷材料的热－力－氧耦合渐进损伤与失效机理研究

项目编号： No.11472066

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： 李卫国

作者单位： 重庆大学

项目金额： 90万元

中文摘要： 对于发展高超声速远程机动飞行器对热防护材料提出的严峻挑战，尤其对热-力-氧耦合作用下其超高温强韧性能的苛刻要求，针对超高温陶瓷热防护材料，通过实验、理论和数值模拟相结合的方法，从宏细观角度，对不同使役环境中特别是极端环境下超高温陶瓷材料的热-力-氧耦合渐进损伤与失效机理进行多学科的交叉研究，在超高温陶瓷材料的强韧性能和损伤失效机理等核心科学问题的基础理论上有所突破，形成超高温陶瓷材料在不同使役环境下力学性能的评价表征方法，建立适用于不同使役环境包含宏细观结构特征具有深刻物理背景的热-力-氧耦合损伤本构模型，开发超高温陶瓷材料热-力-氧损伤/失效分析的数值仿真技术，实现对典型超高温陶瓷试件的失效模拟，为不同使役环境下超高温陶瓷材料的性能表征和损伤失效分析提供有力的研究手段。本项目的研究成果可为超高温陶瓷材料在高超声速远程机动飞行器领域的应用、设计及可靠性评价方面提供理论基础和技术储备。

中文关键词： 超高温陶瓷；热－力－氧耦合；渐进损伤；失效机理；本构模型

英文摘要： For the severe challenges on the thermal protection materials of the development of long-range hypersonic flying vehicles, in particular for the harsh demanding of its ultra-high temperature performance of obdurability under thermo-mechanical-oxidative coupling, this study will make researches on the ultra-high temperature ceramic thermal protection materials from the macro-microscopic view using the combination methods of experiments, theoretical analysis and numerical simulation. The multidisciplinary cross-research on the thermo-mechanical-oxidative coupling progressive damage and failure mechanisms of ultra-high temperature ceramics under different causative environments especially the extreme environments will be conduct, then a breakthrough in the basic theory of core scientific issues of obdurability and damage/failure mechanisms of ultra-high temperature ceramics will be made, and the model and the evaluation methodology about mechanical performances of ultra-high temperature ceramics under different causative environments will be established, further more, a thermo-mechanical-oxidative constitutive model can be used in different operation environments will be proposed which has the profound physical background and including the characteristic of microstructure and macrostructure, and the numerical simulation technique for thermo-mechanical-oxidative damage/failure analysis of ultra-high temperature ceramics will be developed, and it will be used for failure analysis of typical ultra-high temperature ceramic samples in order to provide the powerful study tool for the characterization of performance and failure response of ultra-high temperature ceramics in different operation environments. At the same time, research achievement of this study can also provide theoretical basis and technical reserve for applications, design and reliability assessment in the field of long-range hypersonic flying vehicles.

英文关键词： Ultra-high temperature ceramics;Thermo-mechanical-oxidative coupling;Progressive damage;Failure mechanisms;Constitutive model