Patent classifications
B29K105/10
Method for manufacturing a composite blade for an aircraft engine
A process for manufacturing a blade made of composite material for a turbomachine is provided. The blade includes an airfoil having a pressure side and a suction side which extend from a leading edge to a trailing edge of the airfoil. The blade further includes a metal sheath that extends along the leading edge of the airfoil. The process includes the steps of: a) placing a preform, made by three-dimensionally weaving fibers, in a mold, a polymerizable adhesive being inserted between the sheath and the edge of the preform; and b) injecting polymerizable resin into the mold to impregnate the preform so as to form the airfoil after solidifying, wherein the resin is injected within a time interval during which the adhesive reaches a freezing point.
Glass multiple-ply roving, random mat for forming thermoplastic composite material, and glass-fiber-reinforced thermoplastic resin sheet
Provided is a glass multiple-ply roving that is excellent in impregnation quality of a thermoplastic resin for a random mat and workability in production of a random mat, and can impart excellent strength to a thermoplastic composite material. The glass multiple-ply roving includes a plurality of glass strands, wherein the weight of the glass strands, S, is in the range of 64 to 210 tex, the fiber diameter of the glass strands, D, is in the range of 9.0 to 18.0 m, the ignition loss of the glass multiple-ply roving, L, is in the range of 0.55 to 0.94%, and the S, D, and L satisfy the following formula (1):
4.101000S.sup.1/2/(D.sup.3L.sup.3)7.10(1).
Reinforcing material comprising twisted carbon threads for the manufacture of composite parts, and corresponding methods and use
The invention relates to a reinforcing material (1) consisting of a unidirectional reinforcing web (2) formed of one or more carbon reinforcing yarns (3), associated on each of its faces with a veil of polymeric fibers (4, 5) chosen from among nonwoven materials, the polymeric portion of the reinforcing material representing from 0.5% to 10% of the total weight of the reinforcing material (1), and preferably from 2% to 6% of its total weight, said unidirectional reinforcing web (2) comprising one or a series of reinforcing yarns (3) individually twisted having a twist of 3 turns/m to 15 turns/m, preferably from 6 turns/m to 12 turns/m.