A NOVEL TECHNOLOGY FOR MANUFACTURING NON-CRIMP REINFORCEMENT FABRICS FOR COMPOSITES

摘要

Fiber-reinforced materials are increasingly being used in serial production of automobiles,rnairplanes or wind rotor blades due to their outstanding mechanical abilities in combination withrntheir advantageous lightweight character [1]. The growth in use of technical textiles asrnreinforcement material demands for production technologies which are able to supplyrnreinforcement textiles in large volume with a constant high production quality. This paperrnintroduces a novel production technology for non-crimp fabrics (NCF) which aims for a largescalernproduction. The knitting yarn which is commonly used for bonding the reinforcementrnlayers in non-crimp fabrics [2] is substituted by local injected adhesive dots. This improvementrnin the production process enables the potential for better reinforcement qualities, due to thernabsence of fiber misalignment, yarn damages or “fish-eyes” evoked by the stitching needles.rnThese defects can be seen as most disadvantageous in the classic warp knitting process becausernof resin enrichments after infiltration with a matrix system [3]. The methods and results forrnqualifying the chemical binders according to their function as matrix conform yarn to yarn binderrnare presented to ensure the use in a composite material. Additionally, a model for numericalrndrape simulation was developed which is able to account for the local fixation with adhesiverndots. This local fixation enables a variable adjustment of the drapability due to therninhomogeneity of the layer bonding. The variable bonding of the reinforcement layers and thernadjustable drapability can be represented with the developed mesoscopic model.