Process for manufacturing a structural part made of an organic matrix composite and part obtained
A process for manufacturing a structural part made of an organic matrix composite including: production of a fibrous structure, forming a preform by braiding rovings of a fibrous material on a mandrel that includes a reinforcement in its axial extension, impregnation of the preform with an organic resin; and curing of this resin, the reinforcement, forming the cover, having a bore with an axis perpendicular to the axis for housing a connecting member. Barbs, some of which are projecting, are incorporated into the reinforcement over at least part of the surface of which lying on either side of the bore, the braiding being carried out around the barbs so that the rovings at least partly criss-cross around the barbs.
1. A process of manufacturing a structural component with an end fitting made from an organic matrix composite, the process comprising:
providing a mandrel with a main axis;
providing a reinforcement at an end of the mandrel to present an assembly, the reinforcement including a bore which pierces through main faces of the reinforcement, the bore including an axis perpendicular to the main axis of the mandrel;
inserting pins into the reinforcement such that the pins project outwardly from the main faces of the reinforcement, all of the pins being perpendicular to the main axis of the mandrel and to the main faces of the reinforcement;
braiding rovings of a fibrous material onto the assembly, the braiding of the rovings in a region of the reinforcement crisscrossing around the pins forming a cross shape around the pins to produce a preform;
impregnating the preform with an organic resin; and
curing the impregnated preform,
wherein the bore houses a connecting member.
2. The process as claimed in claim 1 , wherein a reinforcement is positioned at each end of the mandrel.
3. The process as claimed in claim 2 , wherein the reinforcement is a fibrous reinforcement.
4. The process as claimed in claim 3 , wherein the reinforcement is formed of a resin impregnated fibrous material.
5. The process as claimed in claim 4 , wherein, with the mandrel formed of a resin impregnated fibrous material, the resin of the mandrel and of the reinforcement is precured before the fibrous structure is braided and the assembly undergoes full curing once resin has been injected into the fibrous structure.
6. The process as claimed in claim 1 , wherein the reinforcement has a rectangular cross section.
7. The process as claimed in claim 1 , wherein the pins are incorporated into the reinforcement either in a first region situated between the mandrel and a region of the bore, or in a second region situated on another side of the bore in relation to the mandrel, or in both the first region and the second region.
8. The process as claimed in claim 1 , wherein the pins are arranged in a grid pattern, spacing between the pins allowing at least one roving and the crossing of two rovings to be accommodated therein.
9. The process as claimed in claim 1 , wherein a height of the pins is at most equal to a height of the braiding.
10. The process as claimed in claim 1 , wherein the pins are made of metal or of carbon.