Macro fiber for composite articles

Patent metadata

Field	Value
Publication number	US-9851182-B2
Application number	US-201514805231-A
Country	US
Kind code	B2
Filing date	Jul 21, 2015
Priority date	Jun 14, 2012
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A macro fiber for a composite article may include a plurality of inner fibers. Each one of the inner fibers may have an inner fiber final cross-sectional size of less than approximately 100 nanometers. The inner fibers may be surrounded by matrix material.

First claim

What is claimed is:

1. A macro fiber for a composite article, comprising:
a plurality of inner fibers each having an inner fiber final cross-sectional size of less than approximately 100 nanometers;
the inner fibers being surrounded by matrix material and being aligned with one another within the matrix material and having an inner fiber length approximately equivalent to a macro fiber length; and
wherein the matrix material surrounding the inner fibers is initially in a solid state prior to the formation of the composite article and the macro fiber is configured to be positioned adjacent to other macro fibers and the matrix material viscosity is reduced for intermingling with the matrix material of adjacent macros fibers prior to curing or solidifying the matrix material to form the composite article.

2. The macro fiber of claim 1 , wherein:
the macro fiber has a cross-sectional shape comprising at least one of an upper surface and a lower surface; and
at least one of the upper and lower surfaces being substantially planar.

3. The macro fiber of claim 2 , wherein:
the cross-sectional shape comprises a sheet having an aspect ratio of a macro fiber width to a macro fiber thickness of at least approximately 10.

4. The macro fiber of claim 1 , wherein:
the matrix material has an optical property; and
the optical property of the matrix material being substantially equivalent to the optical property of at least one of the inner fibers.

5. The macro fiber of claim 4 , wherein:
the optical property comprises a refractive index.

6. The macro fiber of claim 1 , wherein:
the inner fibers are formed from a material comprising at least one of a thermoplastic material, a thermosetting material, an inorganic material, and a glass material.

7. The macro fiber of claim 6 , wherein:
the inner fibers are formed of a thermoplastic material and are stretched.

8. The macro fiber of claim 1 , wherein:
the matrix material comprises at least one of a thermoplastic material and a thermosetting material.

9. The macro fiber of claim 1 , wherein:
the inner fibers and the matrix material are comprised of substantially optically transparent material.

10. The macro fiber of claim 1 wherein:
the macro fiber has a maximum macro fiber thickness in a range of from approximately 3 microns to 5000 microns.

11. A method of manufacturing a macro fiber, comprising the step of:
forming a plurality of inner fibers each having an inner fiber final cross-sectional size of less than approximately 100 nanometers;
surrounding the inner fibers with matrix material to form a macro fiber, the inner fibers being aligned with one another within the macro fiber and having an inner fiber length approximately equivalent to a macro fiber length;
forming the macro fiber in a predetermined cross-sectional shape; and
wherein the matrix material surrounding the inner fibers is initially in a solid state prior to the formation of the composite article and the macro fiber is configured to be positioned adjacent to other macro fibers and the matrix material viscosity is reduced for intermingling with the matrix material of adjacent macros fibers prior to curing or solidifying the matrix material to form a composite article.

12. The method of claim 11 further comprising the step of:
forming the inner fibers and the matrix material substantially simultaneously.

13. The method of claim 11 wherein the step of forming the macro fiber in the predetermined cross-sectional shape comprises:
forming the predetermined cross-sectional shape with at least one of an upper surface and a lower surface; and
at least one of the upper surface and the lower surface being substantially planar.

14. The method of claim 11 further comprising the steps of:
forming the macro fiber from matrix material having an optical property that is substantially equivalent to the optical property of at least one of the inner fibers.

15. The method of claim 11 further comprising the step of:
stretching the inner fibers.

16. A method of forming a composite article, comprising:
providing a plurality of macro fibers, each one of the macro fibers comprising a plurality of inner fibers surrounded by matrix material initially in a solid state prior to the formation of the composite article, each one of the inner fibers having an inner fiber final cross-sectional size of less than approximately 100 nanometers, the inner fibers within each macro fiber being aligned with one another and having an inner fiber length approximately equivalent to a macro fiber length;
reducing a viscosity of the matrix material to cause intermingling of the matrix material among the plurality of the macro fibers; and
performing at least one of curing and solidifying of the matrix material to form a composite article.

17. The method of claim 16 , wherein the step of providing the plurality of macro fibers additionally comprises:
arranging the macro fibers in side-by-side arrangement to form a structural layer.

18. The method of claim 17 , further comprising the step of:
arranging a plurality of the structural layers in a stacked formation.

19. The method of claim 18 wherein the macro fibers have a stretched direction, the method further comprising the step of:
orienting at least one of the structural layers such that the stretched direction of the macro fibers in one of the structural layers is oriented generally non-parallel to the stretched direction of the macro fibers in an adjacent one of the structural layers.

20. A method of using a composite article, comprising the steps of:
providing a composite article having a plurality of macro fibers, each one of the macro fibers comprising a plurality of inner fibers surrounded by matrix material, each one of the inner fibers having an inner fiber final cross-sectional size of less than approximately 100 nanometers, the inner fibers within each macro fiber being aligned with one another and having an inner fiber length approximately equivalent to a macro fiber length, wherein the matrix material surrounding the inner fibers is initially in a solid state prior to the formation of the composite article and the macro fiber is configured to be positioned adjacent to other macro fibers and the matrix material viscosity is reduced for intermingling with the matrix material of adjacent macros fibers prior to curing or solidifying the matrix material to form the composite article;
placing the composite article in a non-loaded condition; and
placing the composite article in a loaded condition.

21. The method of claim 20 , wherein:
the non-loaded condition is associated with a vehicle being substantially non-moving; and
the loaded condition being associated with the vehicle in motion.

Assignees

• Boeing Co

Inventors

• Wilenski Mark S
• Kozar Michael P

Classifications

• Y10T428/24

  Structurally defined web or sheet [e.g., overall dimension, etc.] · CPC title

• B32B2307/712

  Weather resistant · CPC title

• B32B2307/418

  Refractive · CPC title

• D01F6/00

  Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof · CPC title

• Y10T428/26

  Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension · CPC title