Stock material or miscellaneous articles – Structurally defined web or sheet – Nonplanar uniform thickness material
Patent
1990-03-30
1992-11-10
Robinson, Ellis P.
Stock material or miscellaneous articles
Structurally defined web or sheet
Nonplanar uniform thickness material
428105, 428182, 428184, 428185, 428186, 428213, 52795, 52799, 52800, 52807, 359883, B32B 328, G02B 508
Patent
active
051621436
ABSTRACT:
A uniformly flexible core, and method for manufacturing the same, for use between the face plates of a sandwich structure. The core is made of a plurality of thin corrugated strips, the corrugations being defined by a plurality of peaks and valleys connected to one another by a plurality of diagonal risers. The corrugated strips are orthogonally criss-crossed to form the core. The core is particualrly suitable for use with high accuracy spherically curved sandwich structures because undesirable stresses in the curved face plates are minimized due to the uniform flexibility characteristics of the core in both the X and Y directions. The core is self-venting because of the open geometry of the corrugations. The core can be made from any suitable composite, metal, or polymer. Thermal expansion problems in sandwich structures may be minimized by making the core from the same composite materials that are selected in the manufacture of the curved face plates because of their low coefficients of thermal expansion. Where the strips are made of a composite material, the core may be constructed by first cutting an already cured corrugated sheet into a plurality of corrugated strips and then secondarily bonding the strips to one another or, alternatively, by lying a plurality of uncured strips orthogonally over one another in a suitable jig and then curing and bonding the entire plurality of strips to one another in a single operation.
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Jacoy Paul J.
Porter Christopher C.
Schmitigal Wesley P.
Jones Thomas H.
Loney Donald J.
Manning John R.
Miller Guy M.
Robinson Ellis P.
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