【作者】 方光武； 高希光； 宋迎东；

【Author】 Fang Guangwu;Gao Xiguang;Song Yingdong;School of Mechanical Engineering, Anhui University of Technology;Key Laboratory of Aero-engine Thermal Environment and Structure, Ministry of Industry and Information Technology,College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics;

【机构】 安徽工业大学机械工程学院； 南京航空航天大学能源与动力学院航空发动机热环境与热结构工信部重点实验室；

【摘要】 针对陶瓷基复合材料(CMCs)多层界面相损伤演化机制进行了有限元模拟。采用圆柱单胞作为CMCs的代表体单元,在单胞中考虑多层界面相的实际几何结构,包括界面相各亚层的厚度、成分和层叠次序。然后,对多层界面相内部的损伤萌生和演化进行研究,采用裂纹带方法(crackbandmethod)建立界面相材料的损伤本构模型,并集成到CMCs圆柱单胞力学响应的有限元分析框架中去,用以模拟基体裂纹扩展至界面相处引起其内部发生损伤的过程。在此基础上,对比不同界面相厚度、成分和多层结构的损伤演化规律,分析各因素对CMCs宏观力学性能的影响。结果表明,通过合理配置CMCs内部多层界面相的厚度、成分和结构,可以实现界面相损伤演化的控制和优化。更多还原

【Abstract】 The damage evolution mechanism of multilayer interphase in ceramic matrix composites(CMCs) was simulated by the finite element method. A cylindrical unit-cell was used as the representative volume element of the composites. The actual geometric structure of multilayer interphase is considered in the unit-cell, including the thickness, composition and stacking sequence of each sublayer of interphase. Then, the damage initiation and evolution in multilayer interphase was simulated. The damage model of interphase was established by the crack band theory and integrated into the finite element analysis framework of the mechanical response of the composites. On this basis, the damage evolutions of different interphase thicknesses, composition and multilayer structure were compared. The effects of various factors on the macro-mechanical properties of CMCs were analyzed. The results show that the damage evolution of interphase can be controlled and optimized by reasonably configuring the thickness, composition and structure of multilayer interphase in CMCs.更多还原