Title: TOWARDS A SIMULATION STRATEGY TO PREDICT LAMINATE QUALITY AND POROSITY FOR PARTIALLY IMPREGNATED CFRP PREPREGS
Abstract: Out-of-autoclave (OoA) prepregs produce low-porosity parts through a complex consolidation process that includes air evacuation through a partially impregnated microstructure and subsequent resin infiltration flow. For their successful industrial application, the void content has to be restricted to that of benchmark autoclave structures. A detailed understanding and an optimal selection of processing parameters is required to compensate the reduced consolidation pressure in OoA processing especially for complex structures. Capturing void formation phenomena by simulations is the solution of interest to avoid expensive and protracted testing. In this paper a simulation strategy is proposed which captures the relevant phenomena affecting porosity development. The goal is a coupled FE simulation including air and volatile evacuation, resin flow, fiber bed compaction, mechanical behavior including frictional behavior, and the thermal management. These phenomena have partly strong interdependencies between each other which need to be considered. The output of the proposed FE simulation is the spatial distribution of residual porosity, final thickness and fiber volume contents of parts produced from OoA, enabling an optimized process and part design to gain void free structures.
Authors: JMatthias Copony, Mathias P. Hartmann
Conference: CAMX 2017 –Orlando