×

Foam stiffened hollow composite stringer

  • US 7,879,276 B2
  • Filed: 11/08/2007
  • Issued: 02/01/2011
  • Est. Priority Date: 11/08/2007
  • Status: Active Grant
First Claim
Patent Images

1. A method for manufacturing a hollow composite stringer, the method comprising:

  • forming foam with a mandrel installed into the foam;

    laying up a composite material and the foam with the mandrel installed into the foam onto a tool in a form of a stringer, wherein the composite material defines an elongated first channel of the stringer and wherein the foam with the mandrel installed into the foam is located within the first channel;

    curing the composite material and the foam with the mandrel installed into the foam in the form of the stringer to form a cured stringer;

    removing the mandrel from the foam to form a second channel in the foam; and

    placing the composite material and the foam on a skin ply such that the foam with the second channel formed in the foam is positioned between the composite material and the skin ply.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×