Composite turbomachine blade with in-built root

摘要

A turbine engine blade of composite material comprising fiber reinforcement obtained by multilayer weaving of yarns and densified by a matrix. The blade has a first portion constituting an airfoil forming a single piece with at least one second portion constituting a blade root. The fiber reinforcement portions corresponding to the first and second portions of the blade are mutually interleaved, at least in part, with yarns of the second fiber reinforcement portion penetrating into the first fiber reinforcement portion.

主权项

1. A method of fabricating a turbine engine blade out of composite material comprising fiber reinforcement densified by a matrix, the method comprising:
making a fiber blank by multilayer weaving a single piece comprising, in the longitudinal direction of said fiber blank corresponding to the longitudinal direction of the blade to be fabricated: a first set of a plurality of yarn layers that are interlinked to form a first portion of the blank corresponding to an airfoil preform; and a second set of one or more yarn layers that are interlinked at least locally to form at least a second portion of the blank corresponding to a blade root preform; the yarns of the first set of yarn layers not being interlinked with the yarns of the second set of yarn layers, the first set of yarn layers having the yarns of the second set of yarn layers crossing therethrough in the second portion of the blank; shaping the fiber blank to obtain a one-piece fiber preform having said first portion forming an airfoil preform and at least said second portion forming a blade root preform; and densifying the preform with a matrix in order to obtain a composite material blade having fiber reinforcement constituted by the preform and densified by the matrix, forming a single piece incorporating a blade root.