Yang Bin, Wang Jihui, Feng Yuwei, Zhan Mingfan, Ni Aiqing
School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China.
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.
Polymers (Basel). 2023 Jul 29;15(15):3233. doi: 10.3390/polym15153233.
Properties of reinforcement fabrics, such as permeability, are typically characterized in a volume-averaging sense, whereas the fabric microstructure may vary spatially. This makes designing an effective resin infusion strategy for defect-free composite fabrication challenging. Our work presents a concurrent method for simultaneously measuring the local and global in-plane permeability and offers a handy technique for evaluating spatial variability. This experimental setup was similar to that of unidirectional in-plane permeability tests. The fabric, however, should be cut and tested along the angle bisector of warp and weft directions. The evolution of resin flow fronts was analyzed in real-time using in-house code through live video monitoring. The local and global in-plane permeability components were then obtained by applying Darcy's law regionally and globally. The results are in good agreement with those obtained by radial permeability experiments. Statistical analysis of local permeability reveals that the microstructure variability follows a normal distribution. A complete description of fabric microstructure provided by X-ray microcomputed tomography suggests that local permeability and microstructure variation are closely related, confirming the efficacy of the newly proposed method. This work enables the estimation of fabric structure variability and local and global in-plane permeability in a single test without resorting to expensive volume imaging techniques.
增强织物的性能，如渗透性，通常是从体积平均的意义上进行表征的，而织物微观结构可能会在空间上有所变化。这使得为无缺陷复合材料制造设计有效的树脂灌注策略具有挑战性。我们的工作提出了一种同时测量局部和全局面内渗透率的并行方法，并提供了一种评估空间变异性的便捷技术。该实验装置与单向面内渗透率测试的装置类似。然而，织物应沿着经纬方向的角平分线进行切割和测试。通过内部代码实时分析树脂流动前沿的演变，通过实时视频监控进行。然后通过局部和全局应用达西定律获得局部和全局面内渗透率分量。结果与通过径向渗透率实验获得的结果高度一致。局部渗透率的统计分析表明，微观结构变异性呈正态分布。X射线显微计算机断层扫描提供的织物微观结构的完整描述表明，局部渗透率与微观结构变化密切相关，证实了新提出方法的有效性。这项工作能够在单次测试中估计织物结构变异性以及局部和全局面内渗透率，而无需借助昂贵的体积成像技术。
