The permeability of the fabric preform is a critical input parameter for analyzing the liquid composite molding impregnation process. However, the permeability prediction is challenging due to its complex dependence on the fabric structure. In this paper, a novel analytical model is developed to predict the permeability of non-crimp fabric preform based on the relation between the pressure drop and geometric parameters of the microchannel cross section. The model takes into account four structural parameters including the width, the height, the semi-major axis length of the ellipse section of fiber bundle and the distance between fiber bundles. The permeability of the unit cell is calculated by the presented analytical model and the finite element simulation, respectively. The results show that the channels between fiber bundles play an important role in determining the fabric permeability. The structural parameters of the unit cell have important effects on the permeability. The new structure-related permeability model can accurately predict the permeability of the non-crimp fabric preform in a certain range.
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