Fiber reinforcements used for structural RTM applications feature dual-scale porous microstructures. During injections, these microstructures induce intra-tow resin storage that affects, significantly in fast curing cases, the distribution of temperature, viscosity and degree of cure. Storage is considered permanent in the literature; however, to optimize the process, a finer understanding of the storage and release mechanisms is required. To reach this goal, an experimental program has been implemented. Based on the injection of colored model and UV-curing fluids, the distribution of the colorant during the injection has been studied in a quantitative manner at the macroscopic and microscopic scales. It has been observed that storage is transient and that the release rate depends on the average FVF, the fiber orientation and the architecture of the reinforcement. Furthermore, the local intra-tow flow mechanisms have been identified. Finally the overall/tow permeability ratio has been identified as a good indicator to classify storage trends.

用于结构RTM应用的纤维增强材料具有双重尺度的多孔微结构。在注射过程中，这些微结构会引起丝束内树脂的储存，这在快速固化的情况下会显着影响温度，粘度和固化程度的分布。在文献中，存储被认为是永久性的。但是，为了优化过程，需要对存储和释放机制有更深入的了解。为了达到这个目标，已经实施了实验程序。基于注入有色模型和紫外线固化液，已在宏观和微观尺度上定量研究了注入过程中着色剂的分布。据观察，储存是暂时的，释放速率取决于平均FVF，纤维取向和增强结构。此外，已经确定了局部拖曳内流动机制。最终，总渗透率/丝束渗透率比已被确定为分类存储趋势的良好指标。