Devices and methods to attach a composite core to a surrounding structure
A composite core assembly includes a composite core structure having internal material interfaces and an attachment rail coupled to the composite core structure. The attachment rail includes a first planar surface and a second planar surface adjoined with the first planar surface. The first planar surface is arranged parallel to an internal material interface plane of the composite core structure, and the first planar portion is at least partially integrated into the composite core structure in an internal material interface plane. At least a portion of the first planar surface extends beyond a perimeter surface of the composite core structure, and the second planar surface is configured to attach to the surrounding support member. The core material does not have net edge facets or flat edges positioned next to surrounding structure, and/or may not have a structure arranged parallel to the adjacent support structure to attach to the support structure.
1. A composite core assembly comprising:
a composite core structure including a plurality of interconnected cells, the composite core structure including an upper side, a lower side, and a perimeter edge extending between the upper side and the lower side, the plurality of interconnected cells including cell walls extending between the upper side and the lower side, the composite core structure further comprising two or more ribbon corrugations, the two or more ribbon corrugations defining a ribbon direction; and
at least one attachment rail coupled to the composite core structure, the at least one attachment rail including a first planar member and a second planar member arranged at an angle relative to the first planar member, the first planar member being at least partially integrated into the composite core structure, the first planar member arranged parallel to the ribbon direction of the composite core structure;
wherein the first planar member extends outward from the perimeter edge of the composite core structure.
2. The composite core assembly of claim 1 wherein the composite core assembly is part of a turbine blade, rotor blade, or wing structure.
3. The composite core assembly of claim 1 wherein the first planar member and the second planar member are integrally formed as a single structure.
4. The composite core assembly of claim 1 wherein the first planar member and the second planar member are separate components coupled together.
5. The composite core assembly of claim 1
wherein the at least one attachment rail includes a first attachment rail and a second attachment rail each of which includes a first planar member and second planar member arranged at an angle relative to the first planar member, the first planar member of each of the first attachment rail and the second attachment rail being at least partially integrated into the composite core structure;
wherein the first planar member of each of the first attachment rail and the second attachment rail extends outward from the perimeter edge of the composite core structure; and
wherein the first attachment rail and the second attachment rail are spaced apart on the perimeter edge of the composite core structure.
6. The composite core assembly of claim 1 wherein the first planar member and the second planar member form a T-shape or an L-shape.
7. The composite core assembly of claim 1 wherein the plurality of interconnected cells include cells having a cross-sectional shape that is hexagonal or hat-shaped.