Patent ID: 9102102
Filing Date: 2015-08-11
Classification: B29C,B29L,B64C,Y02P,Y02T,Y10T

Abstract:
1. A structure comprising a plurality of plies of fiber reinforced composite material, each ply having a ply orientation defined by a principal stiffness direction of the ply, the structure having a first region and a second region, each region comprising N1 primary plies, N4 cross plies with a ply orientation substantially perpendicular to the primary plies, N2 positive-angled bias plies with a ply orientation at a positive acute angle to the primary plies, and N3 negative-angled bias plies with a ply orientation substantially perpendicular to the positive-angled bias plies; wherein the ply orientation of the primary plies in each region is more closely aligned with a primary axis of the structure than the cross plies or the bias plies; wherein N1=N4 in the first region but not in the second region; wherein N2=N3 in the second region but not in the first region; and wherein N3/N2 decreases in successive steps across the first region.