陶瓷基复合材料多层界面相应力传递的有限元模拟

方光武; 高希光; 宋迎东

doi:10.13801/j.cnki.fhclxb.20180322.001

陶瓷基复合材料多层界面相应力传递的有限元模拟

1.
安徽工业大学机械工程学院, 马鞍山 243002;
2.
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, 南京 210016;
3.
南京航空航天大学能源与动力学院江苏省航空动力系统重点实验室, 南京 210016

基金项目: 国家重点研发计划（2017YFB0703200）；国家自然科学基金（51575261；51675266）；航空科学基金（2015ZB52015）；安徽工业大学青年教师科研基金（QZ201713）

详细信息

通讯作者:
方光武,博士,讲师,研究方向为复合材料失效机制及多尺度模拟、机械结构强度,E-mail:fgw89424@ahut.edu.cn

中图分类号: TB332
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出版历程
- 收稿日期: 2018-01-01
- 修回日期: 2018-03-03

Finite element simulation of stress transfer through the multilayer interphase in ceramic matrix composites

1.
School of Mechanical Engineering, Anhui University of Technology, Ma'anshan 243002, China;
2.
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, Nanjing 210016, China;
3.
Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

摘要

摘要: 针对陶瓷基复合材料（CMCs）多层界面相的应力传递进行了有限元模拟。采用圆柱单胞模型描述CMCs的细观结构，按相应界面相亚层的实际厚度建立明确的界面相，并假设界面相亚层之间及界面相与纤维、基体之间初始完好结合，然后赋予各界面相亚层不同的材料参数，并采用轴对称有限元法进行求解，最终建立了多层界面应力传递的模拟方法。分别对比了不同厚度热解碳（PyC）界面相、PyC和SiC两种不同成分界面相及（PyC/SiC）和（SiC/PyC）两种结构界面相的应力传递模拟结果。从剪应力沿纤维方向分布及径向分布特点可以看出，通过合理配置CMCs内部多层界面相的结构、成分和厚度，可以实现界面相应力传递及失效模式的控制和优化。
- 陶瓷基复合材料 /
- 多层界面相 /
- 应力分析 /
- 有限元法 /
- 细观力学
Abstract: The stress transfer through the multilayer interphase in ceramic matrix composites was simulated by finite element method. The microstructure of ceramic matrix composites(CMCs) was modeled by a cylinder unit-cell, the sub-layers of interphase were created according to their real thickness within the model. The interfaces between interphase sub-layers, interphase and fibers, interphase and matrix were all assumed to be bonded perfectly. Different material properties were defined for interphase sub-layers, and the axis-symmetry finite element method was applied to analysis the stress. After all, a simulation method for stress transfer through the multilayer interphase was developed. The simulation results for stress transfer within pyolytic carbon(PyC) interphase of different thickness, interphase of different constituents (PyC and SiC), and interphase of different structure ((PyC/SiC) and (SiC/PyC)) were compared. It can be seen from the distribution of stress along fiber and radial direction that the stress transfer and failure mode of interphase in CMCs can be controlled and optimized by rational allocation of the structure, constituent and thickness of multilayer interphase.
- ceramic-matrix composites /
- multilayer interphase /
- stress analysis /
- finite element method /
- micromechanics

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