Complex composite sandwich structure having a laminate and a foa

Details Complex composite sandwich structure having a laminate and a foa Complex composite sandwich structure having a laminate and a foa

1993-09-20

1995-10-03

Watkins, III, William P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Honeycomb-like

428117, 428118, 156197, 156228, B32B 312, B32B 3106

Patent

active

054550963

ABSTRACT:
A composite sandwich structure which includes upper and lower skin structures, first and second honeycomb core structures, and an intermediate portion disposed between the first and second honeycomb core structures. The intermediate portion comprises a composite laminate, a barrier member and a foaming adhesive layer disposed between the composite laminate and the barrier member. The foaming adhesive layer is of a type designed to expand when exposed to an elevated temperature. The composite laminate and the barrier member operate to limit the expansion of the foaming adhesive layer into the open cells of the first and second honeycomb core structures. The foaming adhesive layer, upon expansion, applies pressure against the composite laminate. This pressure, acting concomitantly with the applied curing pressure and the elevated temperature, cures the laminate. Furthermore, the expansion of the foaming adhesive urges the composite laminate and the barrier member apart so as to fill any core discrepancies, i.e., mistrimmed or damaged core, that may exist in the honeycomb core structures.

REFERENCES:
patent: 2654686 (1953-10-01), Hansen
patent: 4335174 (1982-04-01), Belko
patent: 5034256 (1991-07-01), Santiso et al.
patent: 5106668 (1992-04-01), Turner et al.

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