Stiffened composite structural member and method of fabrication

Details Stiffened composite structural member and method of fabrication Stiffened composite structural member and method of fabrication

1975-02-20

1978-04-25

Bell, James J.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

156180, 156243, 156245, 264257, 264258, 264267, 428 47, 428 73, 428116, 428117, 428178, 428224, 428446, B32B 300

Patent

active

040863786

ABSTRACT:
Stiffened structural components, particularly integrally stiffened light weight shell structures, produced by molding astiffening member, preferably formed of a graphite-epoxy composition and having a so-called isogrid rib stiffening configuration, to a partially cured (B-stage) condition, injecting a suitable elastomer, e.g. a silicone, into the open spaces of the isogrid rib stiffener, to stabilize the partially cured composite during subsequent heat forming and curing operations, heat forming the resulting stiffening member to the required contour, e.g. for a cylinder into approximately 90.degree. arcuate isogrid panels, heat forming the skin of the shell structure by laying up a plurality of layers of a pre-impregnated tape within a cylindrical mold, installing a plurality, e.g. four, of the heat formed isogrid stiffening panels into the interior of the skin, co-curing the skin and the isogrid panels to form an integral stiffened shell structure, removing the cylindrical mold from the co-cured stiffened shell structure and removing the elastomer from the spaces between the isogrid rib stiffeners.

REFERENCES:
patent: 2999780 (1961-09-01), Perrault
patent: 3075249 (1963-01-01), Sucher
patent: 3088174 (1963-05-01), Ferndale
patent: 3093160 (1963-06-01), Boggs
patent: 3349157 (1967-10-01), Parsons
patent: 3779851 (1973-12-01), Hertz
patent: 3784664 (1974-01-01), Nicklin
patent: 3790432 (1974-02-01), Fletcher et al.
patent: 3817806 (1974-06-01), Anderson et al.

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