Method for producing parts made of a composite material with reinforcers

A process for the manufacture of a part made of composite material, wherein said part is obtained from a preform comprising local reinforcers and a first impregnation resin of low viscosity, of less than 100 Pa·s, for said preform and in that said process comprises the following stages:

• i) production of said preform comprising a first fibrous material and said local reinforcers, which are provided in the form of reinforcers formed of a second fibrous material having fibers with a greater mechanical strength than that of the fibers of the first fibrous material, so that they exhibit a modulus of rupture or a breaking stress greater by at least 30% than that of the fibers of said first fibrous material, said second fibrous material being preimpregnated with a second, acrylic or polyamide, thermoplastic polymer resin having a glass transition temperature (Tg) of greater than 80° C., the amount of second polymer resin being between 25% and 60% by volume, with respect to the total volume of said second fibrous material,
• ii) impregnation of said preform with the first impregnation resin,
• iii) cooling of said impregnated preform in order to obtain the part.