Conference Paper

Experimental Validation of Numerical Dual-Scale Permeability Prediction. FPCM - 14th International Conference on Flow Processes in Composite Materials, Luleå, Sweden, 2018

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Permeability measurements and predictions are one of the most critical parameters for LCM simulation and have been subject of research for many years. Experimental permeability measurements are time and material consuming, but necessary for today’s FEM simulation. Virtual permeability predictions are based on different models or analytical approaches but the validation with experimental results is lacking. In Dittmann et al. [1] [2] the prediction of dual-scale permeability values with porous yarns in OpenFOAM for the use in FEM filling simulations is already shown. In this study, based on multi-scale triaxial 12K braid models created with TexGen, PAM-Crash and OpenFOAM, a validation of numerical predicted permeability values is addressed. To validate the numerical values and flow characteristics a separation of scale is necessary. Microscopic RVE simulations were validated with a capillary rise test bench. Therefore the permeability of UD preforms in fibre direction and perpendicular was determined. The dual-scale mesoscopic simulations were validated with glass fabrics to visualize the flow characteristics at microscopic and mesoscopic scale. The macroscopic simulations at part level were validated with VARI experiments, in a radial permeability test bench as well as with analytical solutions, published by B. R. Gebart [3], A. C. Long [4] and T. G. Gutowski [5]. Literature [1] J. Dittmann, S. Hügle, P. Seif, L. Kauffmann and P. Middendorf. “Permeability Prediction Using Porous Yarns in a Dual-Scale Simulation with OpenFOAM.” ICCM21, Xi'an, China, 2017. [2] J. Dittmann, S. Hügle, P. Middendorf. “Numerical 3D Permeability Prediction Using Computational Fluid Dynamics.” FPCM13, Kyoto, 2016. [3] B. R. Gebart. “Permeability of unidirectional reinforcements for RTM.” Journal of Composite Materials, Vol. 26, No. 8, p. 1100-1133, 1992. [4] A. C. Long. “Process modeling for liquid moulding of braided performs”. Composites Part A: Applied Science and Manufacturing, Nottingham, 2001. [5] T. G. Gutowski, Z. Cai, S. Bauer, D. Boucher, J. Kingery, S. Wineman. “Consolidation Experiments for Laminate Composites”. Journal of Composite Materials, Vol. 21, Massachusetts, 1987.

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