Reinforcing textile structure for composite materials

Abstract

A reinforcing textile complex for composite materials, comprising a stack of textile layers with a view to their impregnation by a polymer resin, the including complex comprising: an assembly of weft threads (2); an assembly of warp threads (3, 4) associated in pairs, each pair comprising two threads of different type, at least one of which (3) is based on high toughness threads, the two threads of a given pair being woven with the weft threads in a “leno” weave.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a national stage application, filed under 35 U.S.C. §371, of International Application No. PCT / FR2015 / 050520, filed Mar. 4, 2015, which claims priority to French Application No. 1451734, filed Mar. 4, 2014, the contents of both of which as are hereby incorporated by reference in their entirety.BACKGROUND[0002]Technical Field[0003]The invention relates to the textile industry, and more particularly to textiles used as a reinforcement for composite materials. It more specifically aims at a complex formed by a stack of reinforcing layers to be impregnated by a polymer resin, especially a thermosetting resin.[0004]It more specifically relates to a configuration of this type of complex enabling one of its layers to have a function both of mechanical reinforcement and of drainage of the impregnation resin for closed molds.[0005]Description of Related Art[0006]Generally, the manufacturing of composite materials based on fibro...

AI Technical Summary

Benefits of technology

The invention provides a solution for improving the resin impregnation during the infusion process and the mechanical performance of the resulting composite material. This is achieved by using an intermediate layer made of high-tenacity yarns with good mechanical properties and permeability to resin. The layer acts as a structural internal drain to combine the advantages of traditional internal drains and reinforcement layers. The addition of additional layers, such as a glass mat, can further improve the flow capacity and isotropy of the composite. The intermediate layer can replace a reinforcing layer in stacks of a large number of layers, keeping a high mechanical performance level. The lamination can be performed using sewing, gluing or needle punching methods.

Problems solved by technology

Indeed, the resin migration through the textile structure (impregnation) cannot occur if the permeability is not sufficient and if the pressure in the mold is constant.

Such a permeability is generally not sufficient to guarantee a correct filling of the part, which generally has a large size.

The main disadvantage of this method is the large amount of waste (peel ply, external drainage net) and the time necessary to install the consumables.

The major disadvantage of this type of product is the impact on the mechanical properties due to the increase in the resin rate in the final laminate.

This solution, although it has significant advantages, however has the disadvantage of generating resin build-up areas which have much poorer mechanical properties than the external layers, and this all the more as the fibrous material which forms the core is not formed of high-tenacity yarns.

Although this solution has the advantage of not including fibrous materials other than those of the reinforcing layers, it however has the disadvantage of a relatively low permeability to resin in the warp direction.

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