Characterisation and quantification of the dual-scale permeability of anisotropic textile preforms for fiber-reinforced composites

• Applicant: Professor Dr.-Ing. Florian Puch
• Subject Area: Plastics Engineering
• Term: since 2025
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 565746455

In resin injection processes, during the impregnation of fabrics with resins due to the influence of viscous forces and capillary forces, different flow velocities occur within the fiber bundles and the channels between them. This so-called "dual-scale" flow behavior leads to the formation of voids in the production of fiber composite components. In order to better describe this phenomenon, a variety of factors must be taken into account, which are currently mostly calculated using semi-empirical models or empirical corrections. The description of dual-scale flow is based on a complex interlinking of material and process parameters, which have so far been calculated using independent calculation models assuming constant input parameters. The aim of the research project is to extend the semi-empirical submodels to include dynamically variable parameters of the injection process, in order to enable a reliable analytical calculation of the dual-scale flow. A transfer of the description of the flow conditions extended by dynamic flow conditions into numerical simulations serves to validate the models and forms the basis for a later simulative prediction of flow-induced void formation.

• DFG Programme: Research Grants