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首页> 外文期刊>The Journal of the Textile Institute >Axial and transverse permeability of unidirectional fiber-reinforced composites
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Axial and transverse permeability of unidirectional fiber-reinforced composites

机译：单向纤维增强复合材料的轴向和横向渗透率

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摘要

Unidirectional fibrous structures are of interest in composite materials processing for applications in which fluid is injected into preforms that have arrays of parallel fibers and their axes are oriented either perpendicular to or in line with the direction of resin flow. The stumbling block in the liquid molding of composites is the resin infiltration of the fibrous preform. Permeability of the fibrous preform determines the extent of resin infiltration. Despite conduction of considerable researches on various aspects of permeability, measurement and interpretation of this key property is still in its infancy. In this work, permeability of unidirectional fibrous performs in axial and transverse directions which, respectively, correspond to flow along and perpendicular to the axis of fibers were determined. This was achieved by generation of virtual randomly unidirectional fibrous structures using an in-house developed Matlab - based program. Permeability was computed by numerical solution of incompressible creeping Newtonian flow through the porous micro-structures. The results were compared with the published experimental and analytical models. The results were also compared with the experimental data and those of micro-computed tomography-based model of authors. Acceptable agreement between the results and previously published findings was observed. It was also established that randomly unidirectional structures exhibit high anisotropic behavior, possessing an approximate axial to transverse permeability ratio of 4:1.
机译：单向纤维结构在复合材料加工中很重要，这种应用是将流体注入具有平行纤维阵列的预成型件中，并且它们的轴垂直于树脂流动方向或与树脂流动方向成一直线。复合材料液体模塑的绊脚石是纤维预成型件的树脂渗透。纤维预制棒的渗透性决定了树脂的渗透程度。尽管对渗透率的各个方面进行了大量研究，但对该关键特性的测量和解释仍处于起步阶段。在这项工作中，确定了分别在轴向和横向分别对应于沿着和垂直于纤维轴线的流动的单向纤维的渗透性。这是通过使用内部开发的基于Matlab的程序生成虚拟随机单向纤维结构来实现的。通过不可压缩的蠕变牛顿流通过多孔微结构的数值解来计算渗透率。将结果与已发布的实验和分析模型进行了比较。还将结果与实验数据以及基于微计算机断层扫描的作者模型的结果进行比较。观察到结果与先前发表的发现之间的可接受的一致性。还确定了随机单向结构表现出高的各向异性行为，其轴向与横向渗透率之比约为4：1。

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