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Behaviors of Stitched Multi-axial Warp Knit Fabric Composites

机译：缝合多轴经编织物复合材料的行为

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The purposes of stitching multi-axial warp knitted fabric preform prior to the fabrication of the composite materials by resin-transfer molding technique are to improve the resistance to delamination and to increase the out-of-plane properties of the composite materials for structural integrity. The influence of the through-the-thickness stitching on the elastic properties and behaviors of the multi-axial warp knit fabric composites is studied. An analytical model based on the representative volume is proposed to predict the elastic properties of the stitched multi-axial warp knit fabric composite materials. The fiber volume ratios determined by geometric parameters set by the representative volume and elastic behaviors of the in-situ constituent materials are used for the predictions. The crucial step in the analysis is to correlate the averaged stress states in the constituents by adopting bridging matrix. The predicted results are compared with the experimental results. It is found that the predicted results are in reasonably good agreement with the experimental results.
机译：在通过树脂传递模塑技术制造复合材料之前缝合多轴经编针织物预成型坯的目的是为了提高抗分层性并增加复合材料的平面外性能以实现结构完整性。研究了厚缝对多轴经编织物复合材料弹性性能和性能的影响。提出了一种基于代表性体积的分析模型，用于预测多轴经编针织复合材料的弹性性能。由几何参数确定的纤维体积比由代表性的体积和原位组成材料的弹性行为确定，用于预测。分析中的关键步骤是通过采用桥接矩阵来关联构件中的平均应力状态。将预测结果与实验结果进行比较。发现预测结果与实验结果吻合良好。

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