Composite member defining a contour surface

• US 8,318,291 B2
• Filed: 09/27/2010
• Issued: 11/27/2012
• Est. Priority Date: 09/07/2005
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Hogg, Merrill W.
• Primary Examiner(s): THOMPSON, CAMIE S
• Application Number:
  US12/891,347
• Publication Number:
  US 20110014429A1
• Time in Patent Office: 792 Days
• Field of Search: None
• US Class Current: 428/161
• CPC Class Codes: B29C 70/386 Automated tape laying [ATL]
• CPC Class Codes: Y10T 156/10 Methods of surface bonding and/or assembly therefor
• CPC Class Codes: Y10T 428/24479 including variation in thickness
• CPC Class Codes: Y10T 428/24521 with component conforming to contour of nonplanar surface
• CPC Class Codes: Y10T 428/24628 Nonplanar uniform thickness material

Abstract

A composite member and an associated method for forming the composite member are provided. The composite member is formed of a plurality of elongate tapes. Each tape is disposed a path defined by a plurality of natural path segments, each of which defines a non-natural offset angle relative to the adjacent segments.

Claims

1. A composite member formed by a process comprising:

providing a contour surface corresponding in shape to a desired contour of the composite member for supporting a plurality of elongate tapes in a substantially parallel configuration, each tape including a plurality of reinforcement members disposed in a matrix material; and

disposing each of the elongate tapes along a path defined by a plurality of natural path segments, each segment of a single path disposed at a non-natural angle relative to adjacent segments of the path, and each tape comprising a plurality of consecutive, physically discrete portions corresponding to the natural path segments, the discrete portions positioned in a continuous, end-to-end manner in a lengthwise direction of the elongate tape so as to define the non-natural angle between the discrete portions, such that a transverse edge of each elongate tape is disposed within a predetermined offset distance interval from an adjacent one of the tapes.

2. The composite member of claim 1, formed by the process further comprising determining a configuration of each path by:

determining the contour of the surface;

determining a first path across at least a portion of the surface; and

calculating a configuration of each natural path segment of a second path adjacent the first path, a first end of each natural path segment of the second path defining an offset angle relative to an adjacent natural path segment of the second path such that a second end of each natural path segment of the second path defines an offset distance from the first path, the offset distance being within the predetermined offset distance interval.

3. The composite member of claim 2, wherein said calculating step comprises calculating the natural path segments with the offset angle of each natural path segment being less than a maximum offset angle such that the elongate tapes are configured to be disposed without wrinkling.

4. The composite member of claim 2, wherein said calculating step comprises calculating the natural path segments with the offset distance of the second end of each natural path segment being approximately equal to a target distance that is less than the maximum of the predetermined offset distance interval.

5. The composite member of claim 2, wherein said calculating step comprises:

calculating the configuration of a first one of the natural path segments of the second path at a point partially between opposite ends of the second path; and

calculating the configuration of a successive natural path segment of the second path in opposite directions from the first one of the natural path segments, the second end of each successive path segment defining the first end of a successive one of the path segments.

6. The composite member of claim 5, formed by the process further comprising:

prior to said step of calculating the configuration of the first one of the natural path segments, determining a configuration of a natural path adjacent the first path; and

determining a portion of the natural path adjacent the first path defining a minimum transverse distance therebetween,

wherein said step of calculating the configuration of the first one of the natural path segments comprises calculating the configuration of the first one of the natural path segments at a point corresponding in position to the portion of the natural path defining the minimum transverse distance.

7. The composite member of claim 1, wherein said disposing step comprises disposing the elongate tapes from a supply roll of an automated tape laying device and pressing the tape against the contour surface with a compaction device.

8. The composite member of claim 7, wherein said disposing step comprises disposing each tape in the plurality of portions, each portion of each tape being at least about a length of the tape supported between the supply roll and the compaction device of the automated tape laying device.

9. The composite member of claim 1, wherein the elongate tape comprises an elongate tape substantially without wrinkles.

10. The composite member of claim 1, wherein said disposing step comprises disposing each elongate tape with adjacent portions of the tapes defining an offset angle that is less than about 4°

.

11. The composite member of claim 1, wherein said disposing step comprises disposing each elongate tape with adjacent portions defining an offset angle that is less than about 0.5°

.

12. The composite member of claim 1, wherein said disposing step comprises disposing each elongate tape such that each of the consecutive portions defines a length between about 3 inches and 6 feet, adjacent portions of each tape defining the non-natural offset angles therebetween.

13. The composite member of claim 1, wherein said disposing step comprises disposing each elongate tape such that each of the consecutive portions defines a length between about 6 inches and 3 feet, adjacent portions of each tape defining the non-natural offset angles therebetween.

14. The composite member of claim 1, wherein at least two adjacent elongate tapes are positioned substantially without overlapping.

15. A composite member defining a contour surface, the member comprising:

a plurality of elongate tapes disposed in a generally parallel configuration to define the contour surface, each tape including a plurality of reinforcement members disposed in a matrix material,

wherein each of the elongate tapes is disposed along a path defined by a plurality of natural path segments, each segment of a single path disposed at a non-natural offset angle relative to adjacent segments of the path, and each tape comprising a plurality of consecutive, physically discrete portions corresponding to the natural path segments, the discrete portions positioned in a consecutive, end-to-end manner in a lengthwise direction of the elongate tape so as to define the non-natural angle, such that a transverse edge of each elongate tape is disposed within a predetermined offset distance interval from an adjacent one of the tapes.

16. The composite member according to claim 15 wherein the elongate tapes comprise elongate tapes substantially without wrinkles.

17. The composite member according to claim 15 wherein adjacent portions of each tape define non-natural offset angles that are no more than about 4°

.

18. The composite member according to claim 15 wherein adjacent portions of each tape define non-natural offset angles that are no more than about 0.5°

.

19. The composite member according to claim 15 wherein each of the consecutive portions of each tape defines a length between about 3 inches and 6 feet, adjacent portions of each tape defining the non-natural offset angles therebetween.

20. The composite member according to claim 15 wherein each of the consecutive portions of each tape defines a length between about 6 inches and 3 feet, adjacent portions of each tape defining the non-natural offset angles therebetween.