In this project basic scientific knowledge about the impregnation behavior of reinforcement textiles will be gained, which can then be used to design a more efficient resin injection process.
Liquid Composite Molding is a suitable technique for rapid and economical production of components made of Fiber Reinforced Plastics. This applies in particular methods which impregnate fiber structures in out-of-plane direction, such as Compression Resin Transfer Molding. For an accurate process design for those processes, the knowledge about the exact textile behavior is necessary. In a cooperative project with ETH Zurich, funded jointly by the Deutsche Forschungsgemeinschaft and the Schweizer Nationalfonds, a novel approach to characterize impregnation behavior is being developed that combines numerical simulation and the latest experimental methods. At IVW a novel measurement system for determining the flow front progression, single layer displacement, total compaction, volume flow and pressure gradient during an impregnation in out-of-plane direction was designed. Furthermore, a new method for determining the capillary pressure of technical textiles has been developed.
The results of the project have been presented at the 22th International Conference on Composites Materials (ICCM) and published in the journals Composites Part A (DOI: 10.1016/j.compositesa.2019.105495) and Advanced Manufacturing: Polymer & Composites Science (DOI: 10.1080/20550340.2019.1598049). Furthermore, an extension application has been submitted.