Blade having platforms including inserts
A fiber preform for a turbine engine blade and a single-piece blade suitable for being made by means of such a preform, a bladed wheel, and a turbine engine including such a blade; the fiber preform obtained by three-dimensional weaving comprises a first longitudinal segment ( 41 ) suitable for forming a blade root, a second longitudinal segment ( 42 ) extending the first longitudinal segment ( 41 ) upwards and suitable for forming an airfoil portion, a first transverse segment ( 51 ) extending transversely from the junction between the first and second longitudinal segments ( 41, 42 ), and suitable for forming a first platform; the first transverse segment ( 51 ) includes at least one non-interlinked portion comprising a top strip ( 51 b ) and a bottom strip ( 51 a ), and at least one insert ( 61 ) is arranged between the top and bottom strips ( 51 b, 51 a ) of the non-interlinked portion of the first transverse segment ( 51 ).
1. A fiber preform for a turbine engine blade, the preform being obtained by three-dimensional weaving and comprising:
a first longitudinal segment suitable for forming a blade root;
a second longitudinal segment extending the first longitudinal segment upwards and suitable for forming an airfoil portion; and
a first transverse segment extending transversely from the junction between the first and second longitudinal segments, and suitable for forming a first platform;
wherein the first transverse segment includes at least a non-interlinked portion comprising a top strip and a bottom strip; and
wherein at least an insert is arranged between the top and bottom strips of the non-interlinked portion of the first transverse segment.
2. A preform according to claim 1 , wherein at least insert is a two-dimensional woven web.
3. A preform according to claim 1 , wherein at least an insert is a stiffener including a rod or a rigid plate.
4. A preform according to claim 1 , wherein at least an insert is arranged axially along the proximal end of the first transverse segment.
5. A preform according to claim 1 , wherein at least an insert is arranged axially along the distal end of the first transverse segment.
6. A preform according to claim 1 , wherein at least an insert is arranged tangentially, substantially along the longest tangential portion of the first transverse segment.
7. A preform according to claim 1 , wherein at least an insert is arranged tangentially along the upstream or downstream end of the first transverse segment.
8. A preform according claim 1 , wherein the first transverse segment includes at least an axial tab extending substantially axially from the upstream end and/or the downstream end of the first transverse segment, said axial tab comprising a top strip and a bottom strip; and
wherein at least an insert is arranged between the top and bottom strips of said axial tab.
9. A preform according to claim 1 , including a second transverse segment extending transversely from the junction between the first and second longitudinal segments extending the first transverse segment and going away therefrom, being suitable for forming a second platform;
wherein the second transverse segment includes at least a non-interlinked portion comprising a top strip and a bottom strip; and
wherein at least an insert is arranged between the top and bottom strips of the non-interlinked portion of the second transverse segment.
10. A blade for a turbine engine, the blade comprising:
a blade root;
an airfoil portion extending upwards from the blade root; and
a platform extending transversely to the airfoil portion at the junction between the blade root and the airfoil portion;
wherein the platform is made of composite material and has at least a portion including, embedded in a common matrix, a first piece of woven reinforcement, a second piece of woven reinforcement, and an insert arranged between the first and second pieces of woven reinforcement.
11. A blade according to claim 10 , made in single-piece manner out of composite material by means of a fiber preform, said preform being shaped in a mold and being embedded in a matrix of organic type.
12. A bladed wheel for a turbine engine, including a plurality of blades according to claim 11 .
13. A turbine engine including at least a blade according to claim 11 .