Contour weaves for interwoven vanes
A ceramic matrix composite (CMC) vane includes a first platform, a second platform, at least one airfoil extending between and connected to the first platform and the second platform, and at least one integral transition region between the at least one airfoil and the first platform. The airfoil includes a shear tube layer positioned to abut the second platform. A first continuous single-folded fiber sheet forms the first platform, the at least one airfoil, and the at least one integral transition region and an additional fiber sheet overwraps the shear tube layer and the second platform to form a shear tube transition region.
1. A ceramic matrix composite (CMC) vane comprising:
a first platform;
a second platform;
a first airfoil extending between and connected to the first platform and the second platform, the first airfoil comprising a shear tube layer positioned to abut the second platform; and
a first integral transition region between the first airfoil and the first platform;
wherein a first continuous single-folded fiber sheet forms the first platform, the first airfoil, and the first integral transition region; and
wherein an additional fiber sheet overwraps the shear tube layer and the second platform to form a shear tube transition region.
2. The CMC vane of claim 1 , wherein the CMC vane is a singlet.
3. The CMC vane of claim 1 , wherein the CMC vane is a doublet comprising the first airfoil and a second airfoil extending between and connected to the first platform and the second platform.
4. The CMC vane of claim 3 , wherein a second continuous single-folded fiber sheet forms the second platform, the second airfoil, and a second integral transition region between the second airfoil and the second platform.
5. The CMC vane of claim 4 , wherein the second airfoil comprises a shear tube layer positioned to abut the first platform.
6. The CMC vane of claim 1 , wherein the shear tube layer comprises a fibrous ceramic fabric.
7. The CMC vane of claim 1 , wherein the first airfoil comprises a plurality of shear tube layers and wherein an outermost shear tube layer is positioned to abut the second platform and an innermost shear tube layer is separated from the second platform by at least the outermost shear tube layer.
8. The CMC vane of claim 1 , wherein the first continuous single-folded fiber sheet is formed from ceramic fibers.
9. The CMC vane of claim 1 , wherein the second platform is formed of ceramic fibers.
10. A gas turbine engine turbine section comprising: the CMC vane of claim 1 .
11. A ceramic matrix composite (CMC) vane comprising:
a first platform;
a second platform;
an airfoil extending between and connected to the first platform and the second platform;
a first integral transition region between the airfoil and the first platform; and
a second integral transition region between the airfoil and the second platform;
wherein a first continuous single-folded fiber sheet forms the first platform, a first portion of the airfoil, and the first integral transition region, the first continuous single-folded fiber sheet extending to a first location on the airfoil; and
wherein a second continuous single-folded fiber sheet forms the second platform, a second portion of the airfoil, and the second integral transition region, the second continuous single-folded fiber sheet extending to the first location, wherein the first and second continuous single-folded fiber sheets meet at a joint at the first location, the joint comprising ends of fibers of each of the first and second continuous single-folded fiber sheets.
12. The CMC vane of claim 11 , wherein the first continuous single-folded fiber sheet and the second continuous single-folded fiber sheet together form a first contoured layer.
13. The CMC vane of claim 12 and further comprising;
a third continuous single-folded fiber sheet forming the first platform, a first portion of the airfoil, and the first integral transition region, the third continuous single-folded fiber sheet extending to a second location on the airfoil;
a fourth continuous single-folded fiber sheet forming the second platform, a second portion of the airfoil, and the second integral transition region, the second continuous single-folded fiber sheet extending to the second location; and
wherein the third and fourth continuous single-folded fiber sheets meet at a joint at the second location, wherein the third continuous single-folded fiber sheet and the fourth continuous single-folded fiber sheet together form a second contoured layer.
14. The CMC vane of claim 13 , wherein the first location is radially offset from the second location along the airfoil.
15. The CMC vane of claim 1 , wherein the second platform comprises a hole shaped to receive the shear tube of the first airfoil.