Curved composite frames and method of making the same
First Claim
Patent Images
1. A method of fabricating a curved one-piece frame for an aircraft having an integrated shear tie, comprising:
- defining a curvature of the curved one-piece frame using a polar coordinate reference system;
assembling a composite layup, including;
laying up multiple plies of composite material including resin reinforced unidirectional fibers, each of the multiple plies having an angular fiber orientation, andusing the polar coordinate reference system to orient each of the multiple plies relative to the curvature as the multiple plies are being laid up, laying down composite fibers on a tool such that the composite fibers are substantially tangent to the curvature at substantially all points along the curvature, and wherein orienting each of the multiple plies relative to the curvature using the polar coordinate reference system further includes varying a quantity or composition of the multiple plies within the curved one-piece frame, along an arc length or a width of the curved one-piece frame;
placing the composite layup on a tool;
drawing the composite layup down onto the tool; and
after drawing the composite layup down onto the tool, curing the composite layup.
1 Assignment
0 Petitions
Accused Products
Abstract
A curved composite aircraft frame comprises a multi-ply composite laminate having a generally Z-shaped cross section. At least certain of the laminate plies include unidirectional reinforcing fibers that are substantially tangent at substantially all points along the curvature of the frame.
85 Citations
6 Claims
-
1. A method of fabricating a curved one-piece frame for an aircraft having an integrated shear tie, comprising:
-
defining a curvature of the curved one-piece frame using a polar coordinate reference system; assembling a composite layup, including; laying up multiple plies of composite material including resin reinforced unidirectional fibers, each of the multiple plies having an angular fiber orientation, and using the polar coordinate reference system to orient each of the multiple plies relative to the curvature as the multiple plies are being laid up, laying down composite fibers on a tool such that the composite fibers are substantially tangent to the curvature at substantially all points along the curvature, and wherein orienting each of the multiple plies relative to the curvature using the polar coordinate reference system further includes varying a quantity or composition of the multiple plies within the curved one-piece frame, along an arc length or a width of the curved one-piece frame; placing the composite layup on a tool; drawing the composite layup down onto the tool; and after drawing the composite layup down onto the tool, curing the composite layup. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification