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| 二维编织SiC/SiC陶瓷基复合材料宏观弹性常数预测及模态试验研究 |
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胡殿印1,2,3,曾雨琪1,张 龙1,梅文斌1,申秀丽1,2,3,王荣桥1,2,3
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(1. 北京航空航天大学 能源与动力工程学院，北京 100191;2. 航空发动机结构强度北京市重点实验室，北京 100191;3. 先进航空发动机协同创新中心，北京 100191)
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| 摘要: |
| 为了研究二维编织SiC/SiC陶瓷基复合材料振动特性，建立了宏观等效弹性常数预测方法，并在此基础上开展了复合材料平板件的模态分析及试验验证。首先，根据二维编织SiC/SiC陶瓷基复合材料结构特点，建立了基于3次B样条曲线和正弦曲线的单胞模型；然后，利用细观力学有限元法预测了复合材料的宏观等效弹性常数，弹性模量预测结果与文献试验数据的相对误差小于3%；最后，开展了二维编织SiC/SiC陶瓷基复合材料平板件的锤击法模态测试试验，有限元预测的前五阶模态频率与测试结果相比，相对误差均小于4%。 |
| 关键词: 陶瓷基复合材料 二维编织 单胞模型 细观力学有限元法 模态试验 |
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| 基金项目:国家自然科学基金(51675024；51305012；51375031)；航空科学基金(2014ZB51)；国防基础科研计划资助 |
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| Effective Elastic Constants Prediction and Modal Test of 2D Braided SiC/SiC Ceramic Matrix Composites |
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HU Dian-yin1,2,3,ZENG Yu-qi1,ZHANG Long1,MEI Wen-bin1,SHEN Xiu-li1,2,3,WANG Rong-qiao1,2,3
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(1. School of Energy and Power Engineering，Beihang University，Beijing 100191，China;2. Beijing Key Laboratory of Aero-Engine Structure and Strength，Beijing 100191，China;3. Collaborative Innovation Center of Advanced Aero-Engine，Beijing 100191，China)
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| Abstract: |
| In order to study vibration characteristics of 2-D braided SiC/SiC ceramic matrix composites， the method to predict macroscopic effective elastic constants was established， on the basis of which modal analysis and experimental verification were performed on the composite flat coupons. First， in accordance to the architecture characteristics of the 2-D braided SiC/SiC ceramic matrix composites， the unit cell model featured with cubic B splines and sine curves was established. Then， its macroscopic effective elastic constants were predicted in the framework of micromechanical finite element analysis. The predicted elastic modulus has a relative error less than 3% compared with the experimental data in relevant literature. In the end， hammer model test was carried out on the 2-D braided SiC/SiC ceramic matrix composite flat coupons. The finite element predicted frequencies of the first five vibration modes had relative errors less than 4% compared with test results. |
| Key words: Ceramic matrix composites 2-D braided Unit cell model Micromechanical finite element analysis Modal test |
