Abstract
The in-plane and through thickness permeability of unidirectional stitched carbon fiber preforms have been determined through vacuum infusion tests. The impregnation of various dry preforms with different stitching characteristics has been monitored by fiber optic sensors that have been stitched together with the dry tow to manufacture the dry preform. The experimental infusion times have been fitted by a numerical procedure based on Finite Element (FE) processing simu- lations. A good agreement between the numerical and experimental infusion times has been found demonstrating the poten- tiality of the fiber sensor system as suitable tool to evaluate impregnation times and permeability characteristics.
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