Alenia Aeronautica S.p.a.

Cytec Technology Corporation

Alenia Aermacchi S.p.a.

Luca Di Tommaso

Sabato Inserra Imparato

Gianni Iagulli

Vincenzo De Vita

Luigi Capasso

Emmanuele D'Agostino

Marc Doyle

Luigi Avagliano

Marco Fassero

Giuseppe Pace

Eugenio Villella

Carmine Rota

Marc Andrea Doyle

A beam of fiber-reinforced curable thermosetting composite material is preliminarily assembled in an uncured condition. The beam is placed between two forming tools, namely a lower and an upper tool, shaped in such a way as to give the lower and upper flanges a predetermined shape, at least one of the flanges having a non-rectilinear profile viewed in a longitudinal vertical plane. Two longitudinally elongate rigid inserts are placed between the flanges at the sides of the web and are covered in respective airtight tubular bags. The spaces between the upper tool and the lower tool on the two opposite longitudinal sides are sealed. The open opposite ends of the tubular bags are also sealed in such a manner that the pressure applied in an autoclave during the step of curing causes the tubular bags to swell and presses them against the two opposite faces of the web and against the flanges of the beam. On completion of curing, the upper forming tool is removed and the inserts are extracted sideways.

Method of manufacturing spars, longerons and fuselage beams having a variable H cross-section

A method of manufacturing a curved structural element made of composite material has a complex, open cross-section the structural element is formed by the assembly of components made of composite material. A plurality of flat, fresh components are prepared, each component being constituted by a flat layer of curved fibres previously infused with resin, combined with a pre-impregnated layer with straight fibres. Hot-forming of the flat, raw components is then performed. The hot-formed, fresh components are then assembled in accordance with a predetermined sequence on a polymerization tool. The tool includes a shaped, inflatable device astride which a C-shaped raw component is deposited. Finally, the fresh components assembled on the tool are subjected to a polymerization cycle in an autoclave. The inflatable device is inflated by the pressure produced in the autoclave to apply a predetermined pressure from the inside of the C-shaped fresh component.

Method of manufacturing a curved structural element made of composite material and having a complex, open cross-section

A method of manufacturing a curved element made of composite material includes: preparing at least one dry, flat reinforcing layer with curved fibers. A resin film is combined with the dry, flat reinforcing layer, and heat and pressure are applied in controlled manner to bring about the infusion of the resin into the reinforcing layer and to obtain at least one layer of pre-infused material. At least one prepreg layer is prepared with straight fibers impregnated with resin compatible with the resin of the pre-infused material. The layer of pre-infused material and the prepreg layer are superimposed on one another to obtain a layered structure. The layered structure, arranged on a shaped support tool is subjected to a polymerization cycle to obtain the curved element.

Method of manufacturing a curved element made of composite material

A method for manufacturing a recycled prepreg material in strip form, is composed of fiber sections embedded in a resin matrix. A charge of flat scraps from a prepreg starting material is supplied, recording the overall area of the scraps. Then the scraps are fragmented by cutting so as to obtain cut fragments of predetermined size. A strip of backing material and a strip of protective material are supplied. The cut fragments are then distributed in a random manner on the strip of backing material, the feeding speed of the strip of backing material being adjusted depending on the recorded area of the input scraps, so that the cut fragments form a substantially homogeneous layer. The strip of protective material is then arranged over the cut fragments distributed on the strip of backing material, and the whole assembly is then compacted so as to form a strip of recycled prepreg material.

Method for recycling scraps of prepreg materials

Growing community of inventors

Marano di Napoli, Italy

Luca Di Tommaso