SFB/TRR 285–A03

Calculation and evaluation of process-induced material structure phenomena in FKV-metal connections

Fiber-reinforced thermoplastics (FRTP) enable the production of lightweight structures within short cycle times. By leveraging the specific material properties of FRTP, connections between dissimilar joining partners can be realized with innovative assembly interfaces. Joining processes are accompanied by local changes in the material structure.
Within the second funding period, a modeling strategy for direct pin pressing and self-riveting in FRTP is being developed. In addition to process simulation at the meso scale, the work also focuses on analyzing load-bearing behavior. Currently, meso-level modeling strategies for direct pin pressing and self-riveting are under development.
While a multi-filament approach was used during the first funding period, the textile now being employed is represented on meso scale more realistically and combined with extended Lagrange-Euler (ALE) methods. For a numerical representation of the entire process, shear and compaction processes must be taken into account. For this purpose, experimental test environments have already been developed, and numerical studies have been conducted on both micro-scale models (Fig. 1) and cohesive zone and contact formulations at the meso-scale. In the next step, the more suitable cohesive zone approach will be applied to the textile. Building on that, data-based approaches to material modeling will be examined, enabling a subsequent analysis of load-bearing capacity.