Patent ID: 8540833
Filing Date: 2013-09-24
Classification: B29C,B29D,B32B,B64C,Y02T,Y10T

Abstract:
1. A method of fabricating a composite stiffener, comprising: forming a pair of composite channels each having a flange and a radius portion using composite fiber tape having only unidirectional reinforcing fibers, the composite fiber tape placed over a tool; placing a layer of composite fiber fabric on the radius portion of each of the channels, said composite fiber fabric comprising fibers transversely oriented with respect to one another and with respect to said unidirectional reinforcing fibers comprising said channels; forming a base using additional composite fiber tape; placing a layer of said composite fiber fabric on at least a portion of the base; placing a layer of adhesive on and around an outer surface of a filler while said outer surface is not in contact with the channels and the base, said adhesive only on said outer surface and not within said filler; assembling the channels and the base following placing said layer of adhesive; placing the filler and the layer of adhesive in a radius filler zone between the radius portions of the channels and the base; and, curing the assembly to form the composite stiffener.