结合均匀化理论和计算流体动力学技术,实现了对复合材料液体模塑工艺中预成型体渗透率张量的预测.首先,采用均匀化理论分析了流体在多孔介质内的流动问题,推导出广义达西定律,证明以施加周期性边界条件的单胞为研究对象,可以预测预成型体的渗透率张量,并以单向纤维织物为例,对该方法进行了验证.对于复杂结构的预成型体,渗透率的预测分为两步,首先分别确定预成型体中流道和纤维束的渗透率,然后计算其整体宏观渗透率.对于二维平面织物,该方法与其他预测方法及实验的结果吻合较好.本文还考察了单胞的微观结构对渗透率的影响,微观结构相似的预成型体如果孔隙率相同,但束间流道的结构不同,其整体宏观渗透率也存在很大差别.
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