THE INFLUENCE OF THE INTERNAL STRUCTURE OF BI-AXIAL WARP KNITTING FABRICS ON THREE DIMENSIONAL PERMEABILITY

Abstract

Abstract: In order to study the influence of the internal structure of the bi-axial warp knitting fabric on the permeability, a three-dimensional permeability test was performed on a plurality of biaxial fabric preforms with different structures by a 3D permeability test device integrated by image acquisition system and resin flow simulation software. The effects of suture structure and density, fiber bundle fineness, binder coating and other parameters of the biaxial fabric on permeability were analyzed by comparing the variations of in-plane and thickness directions permeabilities. The experimental results show that the in-plane permeability of the fabric with suture structure is lower than that of the automated fiber placement fabric, and the permeability in the thickness direction is much higher than that of the automated fiber placement fabric. Compared with the woven fabric, the warp knitted fabric has a higher in-plane permeability; and the variation of in-plane permeability caused by the variation of the fineness of the fiber bundle in the warp knitted fabric is closely related to the tow compression states. For the fabric with binder surface, the in-plane permeability is reduced while the permeability in the thickness direction is greatly improved.

Key words: liquid composite molding (LCM), fiber reinforced composite, permeability, bi-axial warp knitting fabric

CLC Number:

TB332

GENG Yi, JIANG Jin-hua, CHEN Nan-liang. THE INFLUENCE OF THE INTERNAL STRUCTURE OF BI-AXIAL WARP KNITTING FABRICS ON THREE DIMENSIONAL PERMEABILITY[J]. Composites Science and Engineering, 2020, 0(3): 11-17.

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