Analysis of multiaxial warp-knit preforms for composite reinforcement
Analysis of multiaxial warp-knit preforms for composite reinforcement
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DOI：
10.1016/0266-3538(95)00108-5
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发表时间：
1996-01-01
影响因子：
9.1
通讯作者：
Ko, F
中科院分区：
文献类型：
--
作者：
Du, GW;Ko, F
多轴向经编（MWK）织物的三维结构是近年来发展起来的用于复合材料的多向增强。多层线性纱线在经向（0度）、纬向（90度）和偏置（+/-θ）方向上组装以在特定方向上提供平面内增强，并且它们通过针织纱线缝合在一起以提供结构完整性和贯穿厚度的增强。基于实验观察，MWK织物的晶胞几何形状被确定为沿着与理想化的横截面形状的插入和缝合纱线。几何模型的几何参数和过程变量的开发。表达纤维体积分数和纤维取向的结构和工艺参数，这个几何模型提供了一个基础，为MWK织物预制件的工艺窗口的建立，以及为预测的MWK增强复合材料的力学行为。
Three-dimensional structures of multiaxial warp-knit (MWK) fabrics have been recently developed for multidirectional reinforcement of composites. Multilayers of linear yarns are assembled in warp (0 degrees), weft (90 degrees), and bias (+/-theta) directions to provide in-plane reinforcement in specific directions, and they are stitched together by knitting yarns to provide structural integrity and through-the-thickness reinforcement. Based on the experimental observations, the unit cell geometry of the MWK fabric is identified along with idealized cross-sectional shapes of insertion and stitch yarns. A geometric model is developed relating the geometric parameters and process variables. Expressing fiber volume fraction and fiber orientation in terms of structural and processing parameters, this geometric model provides a basis for the establishment of process windows for the MWK fabric preforms as well as for the prediction of the mechanical behavior of the MWK reinforced composites.