Permeability prediction of non-crimp fabrics based on a geometric model


Loendersloot, R. and Thije, R.H.W. ten and Akkerman, R. and Lomov, S.V. (2004) Permeability prediction of non-crimp fabrics based on a geometric model. In: 11th European conference on composite materials, May 31 - June 3, 2004, Rhodes, Greece.

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Abstract:A model to predict the permeability of Non-Crimp Fabrics is proposed. The model is based on the geometrical features of the fabric. The stitches penetrating the uni-directional plies of the NCF induce distortions in the plane of the fabric. The dimensions of these Stitch Yarn induced fibre Distortions (SYD) are analysed for different fabrics in relaxed and sheared configurations. The length and width of the SYDs are found to be distribution values. The averaged value and the distribution change as the fabric is sheared.
The SYDs form flow channels, which determine the permeability of the NCF. The channels are connected to each other in overlap regions, allowing the fluid to flow from one channel to another and finally to impregnate the entire preform. A network of SYD flow channels is modelled to account for the statistical variations in the dimensions of the SYDs. The flow resistance of a single channel is calculated using a multigrid solver. The global flow is calculated by solving the effective resistance of all flow channels. Analysis of different networks, with varying spatial distribution of the dimensions of the flow channels, allows the prediction of the variation in the permeability of an NCF.
Item Type:Conference or Workshop Item
Engineering Technology (CTW)
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