Multichannel structures made of composites, processes and semifinished products for the manufacture thereof
AssigneeEtat Francais
InventorsMichel Leone, Robert Carbone
Life of this patent
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Abstract
The invention concerns low density multichannel structures made of composites, processes and semifinished products for the manufacture thereof. A multichannel laminated resin structure according to the invention includes cellular fabric (1) defining a row of parallel ducts in each of which is inserted a fitted tubular extrusion (3). The semifinished product is placed between the external reinforcement layers (4, 5). The cellular fabric and reinforcement layers are embedded in a curable resin (6). One application is the manufacture of boat hulls or airframes for light aircraft, noncorrodible and very good mechanical properties.
Claims8
A process for producing a low density composite multichannel structure comprising the steps of:
- providing a cellular fabric having parallel, juxtaposed ducts, said cellular fabric being produced by crossing two layers to form said ducts;
- inserting tubular extrusions with high mechanical properties and low density into said ducts to produce a semfinished product wherein each duct has one tubular extrusion axially fitted therein;
- positioning at least one reinforcement layer on each surface of the cellular fabric of the semifinished product;
- impregnating the reinforcement layers and the cellular fabric with a curable resin;
- curing the curable resin to produce a low density composite multichannel structure.
A low density composite multichannel structure comprising:
- a cellular fabric comprising two crossed layers which define a plurality of parallel juxtaposed ducts;
- a plurality of tubular extrusions with high mechanical strength, one of said tubular extrusions being axially fitted in each of said ducts of the cellular fabric;
- at least one external reinforcement layer located on each outer surface of the cellular fabric;
- and
- a cured resin surrounding said tubular extrusions, said cured resin having said cellular fabric and said reinforcement layers embedded therein.
A semifinished product useful in the manufacture of a multichannel structure, said semifinished product comprising a cellular fabric having two intersecting layers which define a plurality of parallel, juxtaposed ducts, and a plurality of tubular extrusions with high mechanical strength, wherein each of said ducts has one of said tubular extrusions axially fitted therein.
Dependencies are inferred from the claim text.