3D-Braided Thick Composites Made by Simultaneous Outside-in and Inside-out Resin Infusion

Abstract

Thick composites made with traditional impregnation and with simultaneous resin infusion from the inside and outside were studied to compare two methods for optimizing permeability, dipping time, and structural organization. Permeability was greater, the dipping time was shorter, the impregnated resin was more uniformly distributed, and blow hole defects were fewer when infusion was performed simultaneously from the inside and outside of the braided structure. The resin flow channel was preset in the precast body, allowing simultaneous outside-in and inside-out dipping.