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采用“米”字型枝状胞体有限元模型和试验方法对三维四向编织复合材料的整体等效热膨胀系数和等效热传导系数进行了分析并将计算结果和试验值进行了比较。研究表明枝状胞体模型能较为真实的反映三维四向编织复合材料的结构构形 ;有限元方法在分析热膨胀、热传导方面具有较好的精度 ;三维四向编织复合材料编织方向的热膨胀系数随着纤维体积比的增加而减小 ,随着编织角的增加而减小 ;热传导系数随着纤维体积比的增加而增大 ,随着编织角的增大而增大。
The overall equivalent thermal expansion coefficient and equivalent thermal conductivity of the three-dimensional four-directional braided composites were analyzed by using the “m” shaped dendritic cell finite element model and the experimental method. The calculated results and the experimental values were compared. The results show that the dendritic cell model can reflect the real configuration of the three-dimensional four-directional braided composites more accurately. The finite element method has better accuracy in analyzing the thermal expansion and the thermal conductivity. The thermal expansion coefficient of the three-dimensional braided composites Fiber volume ratio decreases, and decreases with the increase of braid angle. The thermal conductivity increases with the increase of fiber volume ratio and increases with the braid angle.