Blade comprising a leading edge shield and method for producing the blade
The invention provides a blade ( 16 ) comprising a blade body ( 30 ) made of organic matrix composite material reinforced by fibers and a leading edge shield ( 32 ) made of a material that withstands point impacts better than the composite material of the blade body. The leading edge shield ( 32 ) is assembled on the blade body ( 30 ) and the blade ( 16 ) includes bonding reinforcement ( 46 ) adhesively bonded on the leading edge shield ( 32 ) and on the blade body ( 16 ). The invention also provides a turbojet including a fan including such blades, and also a method of fabricating such a blade.
1. A blade comprising:
a blade body made of organic matrix composite material reinforced by fibers;
a leading edge shield made of a material that withstands point impacts better than the composite material of the blade body, the leading edge shield being assembled on the blade body; and
a bonding reinforcement adhesively bonded directly to an outer surface of the leading edge shield and adhesively bonded directly to an outer surface of the blade body, the bonding reinforcement extending only partially over the outer surface of the blade body;
wherein the bonding reinforcement includes fibers, and the fibers, for the most part, are oriented perpendicularly to a free edge of the leading edge shield.
2. The blade according to claim 1 , wherein the blade has a leading edge and a trailing edge, and the leading edge shield has a free edge, the bonding reinforcement including a zone covering the leading edge shield and a zone covering the blade body, the zone covering the leading edge shield presenting a width, as measured perpendicularly to the free edge, that lies in the range 0.5 cm to 1.5 cm.
3. The blade according to claim 1 , wherein the blade includes a blade tip and a blade root, the leading edge shield including a projecting portion and a recessed portion, the recessed portion being arranged between the blade tip and the projecting portion, and the bonding reinforcement being positioned within the recessed portion.
4. The blade according to claim 3 , wherein the bonding reinforcement is delimited by the recesed portion.
5. The blade according to claim 1 , wherein the blade has a suction side, a pressure side, and at least two bonding reinforcements, a first bonding reinforcement being adhesively bonded on the pressure side, and a second bonding reinforcement being adhesively bonded on the suction side.
6. The blade according to claim 1 , wherein the blade has a suction side and a pressure side, and wherein the bonding reinforcement comprises a first portion adhesively bonded on the pressure side and a second portion adhesively bonded on the suction side, the first portion and the second portion being connected together by an intermediate portion.
7. The blade according to claim 6 , wherein the intermediate portion is adhesively bonded on the leading edge shield.
8. The blade according to claim 6 , wherein the intermediate portion is adhesively bonded on a trailing edge of the blade.
9. The blade according to claim 6 , wherein the blade includes a blade tip and the intermediate portion is adhesively bonded on the blade tip.
10. A turbojet including a fan having a plurality of blades according to claim 1 .
11. A method of fabricating a blade according to claim 1 , the method comprising the following steps:
assembling together the blade body and the leading edge shield; and
adhesively bonding the bonding reinforcement on the blade.
12. The blade according to claim 1 , wherein the material of the leading edge shield includes a metal or a metal alloy.
13. The blade according to claim 1 , wherein:
the bonding reinforcement is adhesively bonded directly to the outer surface of the leading edge shield such that at least a portion of the outer surface of the leading edge shield is exposed.
14. The blade according to claim 13 , wherein an extent of an overlap of the bonding reinforcement over the leading edge shield, in a direction extending from a trailing edge of the blade toward a leading edge of the blade, is in a range of 0.5 cm to 1.5 cm.
15. The blade according to claim 13 , wherein the outer surface of the leading edge shield includes a leading edge of the leading edge shield.
16. The blade according to claim 15 , wherein:
the blade includes a blade tip and a blade root;
the leading edge shield includes a projecting portion and a recessed portion, the recessed portion being arranged between the blade tip and the projecting portion;
the bonding reinforcement extends only partially over the outer surface of the leading edge shield; and
the bonding reinforcement is positioned within and delimited by the recessed portion.
17. The blade according to claim 1 , wherein:
a bottom of the bonding reinforcement is spaced apart from a root of the blade by a first distance, the first distance defined by at least 0.6 times the height of the blade.
18. The blade according to claim 1 , wherein the fibers are, for the most part, oriented perpendicularly to a free edge of the leading edge shield.
19. The blade according to claim 1 , wherein the bonding reinforcement extends only partially over the outer surface of the leading edge shield.