US 12,006,841 B2
Hybridization of the fibers of the fibrous reinforcement of a fan blade with elastic fibers
Clément Pierre Postec, Moissy-Cramayel (FR); Thomas Alain De Gaillard, Moissy-Cramayel (FR); Guillaume Pascal Jean-Charles Gondre, Moissy-Cramayel (FR); and Pierre-Antoine Gérard Joseph Barbier, Moissy-Cramayel (FR)
Assigned to SAFRAN AIRCRAFT ENGINES, Paris (FR)
Appl. No. 18/025,859
Filed by Safran Aircraft Engines, Paris (FR)
PCT Filed Aug. 31, 2021, PCT No. PCT/FR2021/051501
§ 371(c)(1), (2) Date Mar. 10, 2023,
PCT Pub. No. WO2022/053753, PCT Pub. Date Mar. 17, 2022.
Claims priority of application No. 2009192 (FR), filed on Sep. 11, 2020.
Prior Publication US 2023/0358143 A1, Nov. 9, 2023
Int. Cl. F01D 5/28 (2006.01)
CPC F01D 5/282 (2013.01) [F05D 2300/603 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A blade comprising a structure, the structure being made of composite material and comprising a matrix and a fibrous reinforcement, the structure further comprising a pressure-side wall and a suction-side wall;
wherein the fibrous reinforcement is embedded in the matrix, comprises a first portion forming the suction-side wall of the structure and a second portion forming the pressure-side wall of the structure, and is obtained by three-dimensional weaving of strands, the strands comprising;
first strands and second strands;
wherein the first strands comprise carbon or aramid fibers the Young's modulus of which is greater than 250 GPa; and
wherein the second strands are produced from a viscoelastic material and have a Young's modulus less than 10 Gpa;
wherein the first portion of the fibrous reinforcement comprises uniquely first strands whereas the second portion of the fibrous reinforcement comprises second strands.