编织参数对轴编C/C复合材料热膨胀系数的影响

Effect of weave parameters on thermal expansion coefficient of 4D in-plane C/C composites

将能量法和有限元方法相结合,预报了轴编C/C复合材料的热膨胀性能,通过与实验结果的对比,验证了预报方法的有效性;考虑编织间距和纤维棒直径的变化,预报了该材料热膨胀性能随编织参数的变化。结果表明,采用能量法预报C/C复合材料的热膨胀系数具有较高的精度;轴编C/C复合材料的热膨胀系数随编织间距的增大而减小;随半径的增大,轴向的热膨胀系数逐渐减小,而径向的热膨胀系数逐渐增加。

The thermal expansion properties of the 4D in-plane C/C composites were predicted by combined FEM and the energy method.The validity of the prediction method is proved by comparing the prediction values with the experiment results.The effects of the changing of weave space and the diameter of fiber bundles on the thermal expansion properties of this material were predicted.The result shows that the thermal expansion coefficient（CTE） of 4D in-plane C/C composite decreases with the increase of weave space.Moreover,with the increasing diameter,the thermal expansion coefficient in axial direction decreases,while the coefficient in radical direction increases.