Patent ID: 9657583
Date: 2017-05-23
CPC Classifications: B29C,B29D,B29L,D03D,F01D,F05D,Y10T

Claim:
1. A method of fabricating a reinforcing part of π-shaped section out of composite material, the part including a first portion forming a base that presents a step at at least one of its longitudinal ends, and a second portion forming a stiffener including two legs that extend from a face of the base over at least a fraction of the length thereof, the method comprising: making a first set of a plurality of layers of yarns that are interlinked by three-dimensional weaving to form a first fiber blank portion that is to form a base preform; making a second set of a plurality of layers of yarns that are interlinked by three-dimensional weaving to form a second fiber blank portion that is to form a stiffener preform, yarns of the second set of layers of yarns being interlinked by weaving with the yarns of the first set of layers of yarns in a central interlinked strip extending longitudinally between the two longitudinal ends of the first fiber blank portion and flaring towards side edges thereof in a zone corresponding to a step of the base; shaping the two fiber blank portions to obtain a single-piece fiber preform having a portion forming a base preform and a portion forming a stiffener preform; and depositing a resin in the fiber preform to form a matrix to obtain a composite material reinforcing part comprising fiber reinforcement constituted by the preform that is densified by the matrix.