Tubular fibrous structure with lobes

Patent metadata

Field	Value
Publication number	US-11235492-B2
Application number	US-201916693551-A
Country	US
Kind code	B2
Filing date	Nov 25, 2019
Priority date	May 23, 2017
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

A tubular structure having lobes is produced as a single piece over at least two lobes. Circumferential fibres of the structure have a constant orientation with respect to the longitudinal axis (A) of the structure in any plane (P) transverse to the longitudinal axis. The structure is obtained by weaving or by filament winding.

First claim

What is claimed is:

1. A one piece fibrous structure comprising:
at least two lobes formed only of a single piece; and
circumferential fibers having a constant orientation with respect to a longitudinal axis of the fibrous structure in a plane transverse to the longitudinal axis, wherein the fibrous structure is formed by weaving or by filament winding and the circumferential fibers are continuous across the at least two lobes in a circumferential direction.

2. The fibrous structure according to claim 1 further comprising more than two lobes.

3. The fibrous structure according to claim 1 , wherein the lobes define different shapes.

4. The fibrous structure according to claim 1 further comprising longitudinal fibers inclined with respect to the longitudinal axis.

5. The fibrous structure according to claim 4 , wherein a position of an intersection of the longitudinal fibers with respect to the longitudinal axis varies depending on a position of said plane transverse to the longitudinal axis.

6. The fibrous structure according to claim 1 further comprising a constant circumferential density of longitudinal fibers.

7. The fibrous structure according to claim 1 further comprising a constant longitudinal density of circumferential fibers.

8. The fibrous structure according to claim 1 further comprising longitudinal fibers, wherein a material forming the longitudinal fibers and the circumferential fibers is selected from the group consisting of glass, basalt, carbon, silicon carbide, aluminum oxides, and aluminosilicates.

9. A composite part formed by at least one fibrous structure according to claim 1 embedded in a matrix.

10. The composite part according to claim 9 , wherein lobes of the at least one fibrous structure define different shapes.

11. The composite part according to claim 9 , wherein a height of the lobes is variable depending on a position of the transverse plane.

12. A flow mixer for an aircraft turbojet engine, the flow mixer formed by a composite part according to claim 9 .

13. A method for manufacturing a tubular fibrous structure according to claim 1 , the method comprising weaving the fibrous structure around a take-up mandrel having a shape corresponding to a shape of the fibrous structure.

14. A method for manufacturing a composite part, the method comprising:
manufacturing at least one fibrous structure according to claim 1 by weaving fibers around a take-up mandrel having a shape corresponding to a shape of the at least one fibrous structure;
unwinding the at least one fibrous structure from the take-up mandrel; and
deploying and winding the at least one fibrous structure on a tool having a shape corresponding to a shape of the composite part.

Assignees

• Safran Nacelles

Inventors

• Desjoyeaux Bertrand
• Provost Benjamin
• Depeux Fabien
• Silva De Vasconcellos Davi

Classifications

• B29C70/222

  the structure being shaped to form a three dimensional configuration · CPC title

• D10B2505/02

  Reinforcing materials; Prepregs · CPC title

• D03D13/00

  Woven fabrics characterised by the special disposition of the warp or weft threads, e.g. with curved weft threads, with discontinuous warp threads, with diagonal warp or weft · CPC title

• F02K1/48

  Corrugated nozzles · CPC title

• D03D1/00

  Woven fabrics designed to make specified articles · CPC title