Composite strip

Patent metadata

Field	Value
Publication number	US-9039858-B2
Application number	US-201113074430-A
Country	US
Kind code	B2
Filing date	Mar 29, 2011
Priority date	Aug 2, 2007
Publication date	May 26, 2015
Grant date	May 26, 2015

Abstract

A composite strip and a method of manufacturing a pre-cured composite strip. A pre-cured composite strip having a thermoset resin may be placed on a surface of a portion of a composite component where a caul plate seam may be expected. Caul plates may be placed on the composite component after placing the pre-cured composite strip to form the caul plate seam. The composite component may be cured after placing the caul plates on the composite component.

First claim

What is claimed is:

1. A method of manufacturing a pre-cured composite strip for use with a composite part, the method comprising:
laying up a composite strip comprising a set of fibers and a thermoset resin on a base plate, the composite strip characterized by a longitudinal axis, the set of fibers oriented substantially perpendicular to the longitudinal axis;
curing the composite strip on the base plate to form the pre-cured composite strip, the thermoset resin configured not to melt or soften after curing;
applying the pre-cured composite strip to a surface comprising a fiber reinforced composite material of the composite part, wherein the pre-cured composite strip has a width and a length and wherein the pre-cured composite strip has a thickness that tapers towards opposing edges of the width of the pre-cured composite strip; and
placing a first caul plate and a second caul plate over the composite material and the composite strip, the first caul plate and the second caul plate defining a seam that overlies the composite strip.

2. The method of claim 1 , further comprising a forming step including:
placing a layer of composite tape over a first layer of composite fabric, the composite tape comprising a plurality of fibers oriented substantially perpendicular to the longitudinal axis; and
placing a second layer of composite fabric over the layer of composite tape to form composite layers.

3. The method of claim 2 , wherein the forming step further comprises:
placing a first layer of peel ply over the composite layers; and
placing a second layer of peel ply under the composite layers.

4. The method of claim 2 , wherein the first layer of the composite fabric has a first width, the layer of the composite tape has a second width that is less than the first width, and the second layer of the composite fabric has a third width that is less than the second width.

5. The method of claim 2 , wherein the composite tape, the first layer of the composite fabric, and the second layer of the composite fabric include thermoset resins.

6. The method of claim 3 further comprising:
replacing the first layer of peel ply with an adhesive layer after curing the pre-cured composite strip; and
replacing the second layer of peel ply with a surface layer after curing the pre-cured composite strip.

7. The method of claim 2 , wherein the thermoset resin does not melt or soften if subjected to a second curing process.

8. The method of claim 1 , wherein the base plate is substantially flat.

9. The method of claim 1 , wherein the base plate comprises a curvature that substantially matches an outer mold line for the composite strip.

10. A method of applying a pre-cured composite strip for use with a composite part, the method comprising:
placing a first peel ply layer on a base plate;
placing a first composite fabric layer on the first peel ply layer, the first composite fabric layer comprising a fiber material and a thermoset resin;
placing a tape layer on the first composite fabric layer, the tape layer comprising a plurality of unidirectional fibers and the thermoset resin, the tape layer characterized by a longitudinal axis, the plurality of unidirectional fibers oriented substantially perpendicular with respect to the longitudinal axis;
placing a second composite fabric layer on the tape layer, the second composite fabric layer comprising a fiber material and the thermoset resin; and
curing the first composite fabric layer, the tape layer, and the second composite fabric layer to form the pre-cured composite strip, the thermoset resin in the first composite fabric layer, the tape layer, and the second composite fabric layer configured not to melt or soften after curing;
placing the pre-cured composite strip on a surface comprising a fiber reinforced composite material of the composite part;
bonding the pre-cured composite strip onto the surface of the composite part with an adhesive;
placing a first caul plate and a second caul plate over the surface of the composite part such that a seam between the first caul plate and the second caul plate overlies the pre-cured composite strip; and
curing the composite part.

11. The method of claim 10 further comprising removing the first peel ply layer so as to expose a surface of the first composite fabric layer.

12. The method of claim 11 further comprising placing an adhesive on the surface of the first composite fabric layer; and bonding the surface of the first composite fabric layer with the adhesive to the composite component.

13. The method of claim 10 further comprising placing a second peel ply layer on the second composite fabric layer.

14. The method of claim 10 further comprising placing an additional tape layer on the tape layer.

15. The method of claim 10 , wherein the first composite fabric layer has a first width; the tape layer has a second width that is smaller than the first width; and the second composite fabric layer has a third width that is smaller than the second width.

16. The method of claim 10 , wherein at least one of the first composite fabric layer and the second composite fabric layer is a prepreg layer.

17. A method of manufacturing a pre-cured composite strip for a composite part, the pre-cured composite strip oriented with respect to a longitudinal axis of a composite part, the method comprising:
placing a first peel ply layer on a base plate;
placing a first composite fabric layer on the first peel ply layer, the first composite fabric layer comprising a fiber material and a thermoset resin;
placing a tape layer on the first composite fabric layer, the tape layer comprising a plurality of unidirectional fibers and the thermoset resin;
placing a second composite fabric layer on the tape layer, the second composite fabric layer comprising a fiber material and the thermoset resin;
curing the first composite fabric layer, the tape layer, and the second composite fabric layer to form the pre-cured composite strip, the thermoset resin in the first composite fabric layer, the tape layer, and the second composite fabric layer configured not to melt or soften after curing;
removing the first peel ply layer so as to expose a surface of the first composite fabric layer;
placing an adhesive on the surface of the first composite fabric layer;
bonding the surface of the first composite fabric layer with the adhesive to a surface comprising a fiber reinforced composite material of the composite part, the composite part characterized by a longitudinal axis, the composite strip positioned such that the plurality of unidirectional fibers in the tape layer are oriented substantially perpendicular with respect to the longitudinal axis of the composite part, the composite part comprising a fiber reinforced with resin composite material; and
placing a first caul plate and a second caul plate over the composite material and the composite strip, the first caul plate and the second caul plate defining a seam that overlies the composite strip.

18. The method of claim 17 , wherein the first composite fabric layer has a first width; the tape layer has a second width that is smaller than the first width; and the second composite fabric layer has a third width that is smaller than the second width.

Assignees

• Dull Kenneth M
• Ingram William H
• Boeing Co

Inventors

• Dull Kenneth M
• Ingram William H

Classifications

• Y10T156/1093

  with covering of discrete laminae with additional lamina · CPC title

• B29C66/73941

  characterised by the materials of both parts being thermosets · CPC title

• B29C66/5326

  said single elements being substantially flat · CPC title

• B29C66/72141

  Fibres of continuous length · CPC title

• B29C65/02

  by heating, with or without pressure · CPC title