基于经纱矩形截面及纬纱双凸透镜截面假设,分析了2.5维机织复合材料的细观几何结构,重点考虑了该结构表层经纱与内部经纱密度的不同及相同机织结构合成不同厚度和纤维束截面的情况,建立了2.5维机织复合材料的单胞几何模型.该几何模型可以计算各种2.5维机织结构单胞内各纱线系统的形态,包括取向角和纤维体积分数.通过对8种结构28个试件纤维体积分数的测定,与计算预测结果的对比表明本文中建立的几何模型较好地反映了2.5维机织复合材料的内部结构.此外,利用本模型计算分析了3种不同结构的纤维体积分数和取向角.结果表明:单胞内经纬纱交织的次数是决定纤维体积含量的一个关键因素;直联结构相比弯联结构,其经纱取向角明显降低.
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