Multi-scale 3D image-based modelling of a carbon/carbon composite
Multi-scale 3D image-based modelling of a carbon/carbon composite
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DOI：
10.1088/0965-0393/21/8/085014
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发表时间：
2013-12-01
影响因子：
1.8
通讯作者：
Sheikh, M. A.
中科院分区：
文献类型：
--
作者：
Alghamdi, A.;Mummery, P.;Sheikh, M. A.
由于复合材料的异质性和几何复杂性，对编织复合材料进行详细的热和机械有限元分析在计算上具有挑战性。在本文中，使用不同长度尺度的两个基于图像的有限元三维模型来评估二维碳/碳复合材料的热扩散率和刚度。微观尺度模型是根据碳丝束的 SEM 显微照片开发的，而宏观尺度模型则是根据复合材料的高分辨率 X 射线断层扫描图像得出的。微尺度模型预测三个正交方向（x、y 和 z）的丝束尺度的热导率和杨氏模量。然后将微观尺度模型的输出结果合并到宏观尺度模型中，以获得全厚度热扩散率和面内杨氏模量。建模结果与激光闪光和拉伸测试获得的实验结果非常吻合，偏差在5%的数值误差范围内。
Detailed thermal and mechanical finite element analyses of woven composites are computationally challenging due to the heterogeneous nature and the geometrical complexity of the composite. In this paper two finite element three-dimensional image-based models at different length scales are used to evaluate the thermal diffusivity and stiffness of a 2D carbon/carbon composite. The micro-scale model was developed from SEM micrographs of the carbon tow whereas the macro-scale model was derived from high resolution x-ray tomographic images of the composite. The micro-scale model predicts thermal conductivities and Young's modulus at the tow scale in the three orthogonal directions (x, y and z). The output results from the micro-scale model are then incorporated in the macro-scale model to obtain through-thickness thermal diffusivity and in-plane Young's modulus. The modelling results are in excellent agreement with the experimental results obtained from the laser flash and tensile tests and the deviations are within the bounds of numerical error of 5%.