Composite structures constructed of wound tubular braiding
A system for constructing a composite structure includes a braiding machine, a winding tool and a forming machine. The composite structure is constructed of a wound tubular braiding. The wound tubular braiding is constructed of a biaxial or triaxial tubular braid of unidirectional tape.
1. A method of forming a composite structure, the method comprising:
winding a tubular braiding around an outer surface of a winding tool to form a wound tubular braiding having stacked turns, the tubular braiding defining a central bore extending along a length therethrough; and
forming the wound tubular braiding into the composite structure by consolidating the stacked turns of the wound tubular braiding into flattened plies having a solid cross-section thereby eliminating the central bore.
2. The method of claim 1 , further comprising fabricating the tubular braiding from materials selected from the group consisting of: a unidirectional tape and a unidirectional tow.
3. The method of claim 2 , wherein the unidirectional tape is constructed from unidirectional fibers.
4. The method of claim 1 , further comprising winding the tubular braiding into a spiral pattern around the winding tool.
5. The method of claim 1 , further comprising slipping the unidirectional tape relative to one another without bending when the tubular braiding is wound around the winding tool.
6. The method of claim 1 , further comprising pre-impregnating the wound tubular braiding with a resin.
7. The method of claim 1 , further comprising applying heat while consolidating the wound tubular braiding.
8. The method of claim 7 , wherein the wound tubular braiding is heated to a resin melt temperature.
9. The method of claim 1 , wherein the unidirectional tape shear relative to one another without bending when consolidating the wound tubular braiding.
10. The method of claim 1 , wherein the tubular braiding has a biaxial braid.
11. The method of claim 1 , wherein the tubular braiding has a triaxial braid.
12. The method of claim 1 , further comprising winding the tubular braiding into a helical pattern around the winding tool.
13. The method of claim 1 , wherein the tubular braiding has a first free end and a second free end.
14. The method of claim 13 , wherein the first free end overlaps the second free end when the tubular braiding is wound around the winding tool.
15. The wound tubular braiding of claim 1 , wherein the tubular braiding wound around the winding tool is formed of a single length of the tubular braiding.
16. The method of claim 1 , wherein forming the wound tubular braiding into the composite structure includes placing the wound tubular braiding and the winding tool into a mold and consolidating the wound tubular braiding using heat and pressure.
17. A method of forming a composite structure, the method comprising:
winding a tubular braiding around an outer surface of a winding tool to form a wound tubular braiding having stacked turns, the tubular braiding defining a central bore extending along a length therethrough;
placing the wound tubular braiding and the winding tool into a mold; and
consolidating, using heat and pressure, the stacked turns of the wound tubular braiding within the mold into flattened plies having a solid cross-section thereby eliminating the central bore, to form the composite structure.
18. The method of claim 17 , wherein the winding tool includes an axis, and the tubular braiding is wound about the axis.
19. The method of claim 18 , wherein consolidating the wound tubular braiding on the winding tool to form the composite structure includes compacting the wound tubular braiding flat in a direction parallel to the axis.
20. The method of claim 19 , further comprising winding the tubular braiding into a helical pattern around the winding tool.