Abstract
A Non-Crimp Fabric (NCF) is composed of some layers which have large number of fiber bundles aligning in a certain direction and are stacked and fixed with a thin thread compared with the reinforcing fiber bundle by warp knitting technology. In the reinforced form of the composite material, there is no crimp of the fiber bundle compared with other fabric such as woven, knitted fabric or etc., and composite materials reinforced by NCF shows better mechanical properties. Since it is easy to control the orientation angle, it is also possible to control the mechanical properties as required. Therefore, in recent years, it has been widely used as a reinforcement of large-sized composite material structural members such as watercraft, automobile, wind turbine blades, and etc. Many studies on the mechanical properties of composite materials using NCF have been made so far, however, little attention has been paid to the difference in the tension and structure of the warp knitting yarn binding the reinforcing fiber bundles in NCF.In this study, the effect of difference of tension and structure of warp knitting yarn on the structure of reinforcing fibers and the mechanical properties of composite materials were investigated. In addition, the effects of those differences in NCF on permeability properties were also investigated.
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