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Effects of through-the-thickness stitches on the elastic behavior of multi-axial warp knit fabric composites

机译：厚针迹对多轴经编织物复合材料弹性行为的影响

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摘要

In order to improve the resistance to delamination and some in-plane and out-of-plane properties of composite materials for structural integrity, through-the-thickness reinforcement must be provided. The reinforcement is achieved by using the stitched multi-axial warp knit (MWK) fabrics as preforms for the fabrication of composite structures. In this study, the influence of stitches on the elastic behavior of MWK fabric composites under tensile and shear loadings was investigated by utilizing a unified micro-mechanical model. In the analysis, the in situ constituent properties and fiber volume ratios of insertion and stitching fibers determined from the geometric parameters set by the representative volume were used. The crucial step in the analysis was to correlate the averaged stress states in the constituents by adopting the bridging matrix. The experimental results were compared with the predicted results. It was found that the predicted results are in reasonably good agreement with the experimental results.
机译：为了提高抗分层性以及复合材料在结构完整性方面的一些面内和面外性能，必须提供厚度方向的增强。通过使用缝制的多轴经编（MWK）织物作为复合结构的预制件来实现加固。在这项研究中，通过使用统一的微观力学模型，研究了缝线对MWK织物复合材料在拉伸和剪切载荷下的弹性行为的影响。在分析中，使用了由代表体积设定的几何参数确定的插入和缝合纤维的原位组成特性和纤维体积比。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。将实验结果与预测结果进行了比较。发现预测结果与实验结果吻合良好。

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