Method for making complex integral structural members from a...

D - Textiles – Paper – 04 – H

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D04H 18/00 (2006.01) B29B 11/16 (2006.01) B29C 67/00 (2006.01) B29C 70/54 (2006.01) B29D 12/00 (2006.01) D04H 1/00 (2006.01) B29C 53/02 (2006.01)

Patent

CA 2191558

A fiber preform is made solely from a deformable base fiber structure that is initially in the form of a plane plate constituted by superposed two-dimensional fiber plies bonded together by needling. Cuts and/or splits are formed in the base fiber structure, and the preform is made from the cut and/or split base fiber structure by making use of its ability to be deformed. The structural part is obtained by densifying the preform using a material that constitutes a composite material matrix. It is possible to use a single fiber structure plate which is deformed with the help of splits or cuts so as to obtain the desired preform and in which continuity of the base fiber structure is preserved, or else a plurality of base fiber structure plates can be used which are assembled together by mutual interfitting via the splits or outs, by deforming at least: one of the plates.

Pour réaliser une préforme fibreuse, on utilise uniquement une structure fibreuse de base déformable se présentant sous la forme de plaque plane constituée par des strates fibreuses bidimensionnelles superposées liées entre elles par aiguilletage. Des découpes et/ou des fentes sont pratiquées dans la structure fibreuse de base, et la préforme est réalisée à partir de la structure fibreuse de base découpée et/ou fendue en utilisant la déformabilité de celle-ci. La pièce structurale est obtenue par densification de la préforme par un matériau constitutif de la matrice du matériau composite. On peut utiliser une plaque unique de structure fibreuse qui est déformée grâce aux fentes ou découpes pour obtenir la préforme désirée dans laquelle la continuité de la structure fibreuse de base est préservée, ou utiliser plusieurs plaques de structure fibreuse de base qui sont assemblées en étant mutuellement imbriquées grâce aux fentes ou découpes par déformation d'au moins l'une d'entre elles.

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