Elastic Modulus Prediction of Three-dimension-4 Directional Braided Cf/SiC Composite Based on Double-scale Model
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2015年第3期
论文作者：牛序铭 SUN Zhigang KONG Chunyuan 宋迎东
文章页码：500 - 508
摘 要：Double-scale model for three-dimension-4 directional（3D-4d） braided C/SiC composites has been proposed to investigate its elastic properties. The double-scale model involves micro-scale that takes fiber/matrix/porosity in fi bers tows into consideration with unit cell which considers the 3D-4d braiding structure. Micro-optical photographs of composites have been taken to study the braided structure. Then a parameterized finite element model that refl ects the structure of 3D-4d braided composites is proposed. Double-scale elastic modulus prediction model is developed to predict the elastic properties of 3D-4d braided C/SiC composites. Stiffness and compliance-averaging method and energy method are adopted to predict the elastic properties of composites. Static-tension experiments have been conducted to investigate the elastic modulus of 3D-4d braided C/SiC composites. Finally, the effect of micro-porosity in fi bers tows on the elastic modulus of 3D-4d braided C/SiC composites has been studied. According to the conclusion of this thesis, elastic modulus predicted by energy method and stiffness-averaging method both fi nd good agreement with the experimental values, when taking the micro-porosity in fi bers tows into consideration. Differences between the theoretical and experimental values become smaller.
牛序铭1，SUN Zhigang1，KONG Chunyuan1，宋迎东1,2
1. Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics2. State Key Laboratory of Mechanics and Control Mechanical Structures, College of Energy and Power, Nanjing University of Aeronautics & Astronautics
摘 要：Double-scale model for three-dimension-4 directional（3D-4d） braided C/SiC composites has been proposed to investigate its elastic properties. The double-scale model involves micro-scale that takes fiber/matrix/porosity in fi bers tows into consideration with unit cell which considers the 3D-4d braiding structure. Micro-optical photographs of composites have been taken to study the braided structure. Then a parameterized finite element model that refl ects the structure of 3D-4d braided composites is proposed. Double-scale elastic modulus prediction model is developed to predict the elastic properties of 3D-4d braided C/SiC composites. Stiffness and compliance-averaging method and energy method are adopted to predict the elastic properties of composites. Static-tension experiments have been conducted to investigate the elastic modulus of 3D-4d braided C/SiC composites. Finally, the effect of micro-porosity in fi bers tows on the elastic modulus of 3D-4d braided C/SiC composites has been studied. According to the conclusion of this thesis, elastic modulus predicted by energy method and stiffness-averaging method both fi nd good agreement with the experimental values, when taking the micro-porosity in fi bers tows into consideration. Differences between the theoretical and experimental values become smaller.
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