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Core design for use with precision composite reflectorsA uniformly flexible core, and method for manufacturing the same, is disclosed 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 particularly 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.
Document ID
19930005511
Acquisition Source
Legacy CDMS
Document Type
Other - Patent
Authors
Porter, Christopher C. (NASA Pasadena Office CA, United States)
Jacoy, Paul J. (NASA Pasadena Office CA, United States)
Schmitigal, Wesley P. (NASA Pasadena Office CA, United States)
Date Acquired
August 16, 2013
Publication Date
November 10, 1992
Subject Category
Composite Materials
Accession Number
93N14700
Funding Number(s)
CONTRACT_GRANT: NAS7-918
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Patent
NASA-CASE-NPO-17858-1-CU|US-PATENT-5,162,143
Patent Application
US-PATENT-APPL-SN-503487

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