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首页> 外文会议>International Conference on Advanced Ceramics and Composites >EFFECTIVE THERMOELASTIC PROPERTIES OF C/C COMPOSITES CALCULATED USING 3D UNIT CELL PRESENTATION OF THE MICROSTRUCTURE
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EFFECTIVE THERMOELASTIC PROPERTIES OF C/C COMPOSITES CALCULATED USING 3D UNIT CELL PRESENTATION OF THE MICROSTRUCTURE

机译：使用3D单位细胞呈现微结构计算C / C复合材料的有效热弹性性能

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摘要

Both the micro constituents of C/C composites, carbon fibers and pyrolytic carbon (PyC) are orthotropic and, for this reason, effective properties of these composites are strongly dependent on the fibers arrangement in the preform. For a better understanding of the relationship between fiber orientations and the corresponding elastic properties, 3D unit cell models for different fiber distributions have been created.These cells are numerically generated and reproduce 3D fibers arrangements in the real preform. For this purpose statistical studies of a carbon felt and 2D preforms were provided and corresponding distribution functions were identified.The numerical procedure for microstrueture generation consists in the creation of a set of non-intersecting cylinders. It is considered that the fibers are straight and there is no "packing problem" due to their low volume fraction (less than 25%). The distribution of the cylinders is random and it statistically corresponds to the distribution of the fibers studied by micro computer tomography (u.CT).Then, a growth algorithm is used for reproduction of the PyC coating on the fiber interfaces. After that, the generated geometry of the microstrueture is meshed and utilized for calculation of the effective mechanical properties by the FE method. The calculated elastic and thermal properties are close to those obtained by using homogenization procedures.
机译：C / C复合材料，碳纤维和热解碳（PYC）的微观成分均为正透视，因此，这些复合材料的有效性能强烈地取决于预制件中的纤维布置。为了更好地理解纤维取向与相应弹性特性之间的关系，已经创建了用于不同光纤分布的3D单元电池模型。这些细胞在数值上产生并再现真实预制件中的3D纤维布置。为此目的，提供了对碳毡和2D预成型件的统计研究，并确定了相应的分布函数。微足生生成的数值过程包括一组非交叉汽缸的创建。认为纤维是直的，由于它们的低体积分数（小于25％），没有“包装问题”。汽缸的分布是随机的，并且它统计学对应于通过微计算机断层扫描（U.CT）所研究的纤维的分布。然后，该生长算法用于在光纤接口上再现PYC涂层。之后，将产生微足迹的产生的几何形状被啮合并用于通过Fe方法计算有效的机械性能。计算的弹性和热性质接近通过使用均化程序获得的那些。

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