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连续纤维增韧碳化硅陶瓷基复合材料(ceramic matrix composite-SiC,CMC-SiC)是近年来迅速发展的一种新型低密度热结构材料,在高推比航空发动机、高比冲火箭发动机、冲压发动机和防热结构一体化材料等方面具有广阔的应用前景。航空航天器超常服役环境对材料的环境性能提出十分苛刻的要求,通过试车和试飞考核材料耗时、耗资,难以满足材料研制需求,发展科学高效的材料环境性能实验模拟和计算机模拟技术是国际研究的热点,也是材料优化设计的基础。本文介绍了基于“相似理论”建立的与航空发动机环境具有等效性的环境实验模拟平台和风洞模拟平台。利用该实验模拟平台研究了热物理化学因素与复杂应力因素耦合条件下CMC-SiC环境性能演变失效规律。基于计算热力学、分子模拟和因素分析法等理论与方法,初步建立了CMC-SiC相应的环境性能计算机模拟系统,揭示了材料的环境性能演化规律及其微观机制。
Continuous fiber-reinforced silicon carbide ceramic matrix composite (CMC-SiC) is a new type of low-density thermal structure material that has been rapidly developed in recent years. It has been widely used in high thrust ratio aeroengines, high ratio rocket motors, Engine and heat-resistant materials such as integrated structure has broad application prospects. Exceptional service environment of aviation and spacecraft puts forward very strict requirements on the environmental performance of materials. It is hard to meet the demand of material development through trial and flight test and to develop scientific and efficient material environment performance test simulation and computer simulation technology through international test The hot spots, but also the basis for material optimization design. This paper introduces an environment experiment simulation platform and a wind tunnel simulation platform based on the “similarity theory” that is equivalent to the aero-engine environment. The experimental simulation platform was used to study the evolution and failure of CMC-SiC environment under the coupling of thermophysical and complex stress factors. Based on the theories and methods of computational thermodynamics, molecular simulation and factor analysis, the corresponding computer simulation system of environmental performance of CMC-SiC was initially established to reveal the evolution law and microscopic mechanism of environmental performance of CMC-SiC.