Prediction of elastic properties of three dimensional woven C/C SiC composite
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摘要: 试验研究了三维机织C/C-SiC复合材料的弹性性能, 基于复合材料的扫描电镜(SEM)照片, 分析了材料的细观结构的特点, 并提出了一系列的假设, 建立了三维机织C/C-SiC复合材料的细观力学模型, 利用均匀化方法预测了复合材料的弹性常数, 分析了材料的弹性性能随经纱倾斜角的变化规律。结果表明: 预测结果与试验结果吻合较好, 表明该预测模型和方法的正确性; 随着经纱倾斜角的增加, 经纱方向的弹性模量降低, 其它方向的弹性模量均增大, 但面内剪切模量和厚度方向的弹性模量增幅很小。
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关键词:
- 三维机织C/C-SiC复合材料 /
- 弹性性能 /
- 预测 /
- 均匀化方法
Abstract: The elastic properties of three-dimensional woven carbon fiber reinforced C-SiC binary matrix(3D woven C/C-SiC) composite were studied. Based on the scanning electron micrographs (SEM) of 3D woven C/C-SiC composite, the micro-structure was analyzed, a series of assumptions were proposed, and the micro-mechanical model was founded. The elastic properties of 3D woven C/C-SiC composite are evaluated with homogenization method. The variable regularity of elastic modulus is also studied as the warp angle increases. The results of the numerical calculation agree with the experiments very well, and the method of numerical calculation is proved to be accurate; as the warp angle increases, the elastic modulus in the warp direction decreases and the elastic moduli in other directions increase, but the in-plane shear modulus and the elastic modulus in thickness direction increase a little. -
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