Accession Number : ADA306122

Title :   Fabrication of Lightweight Composite Sandwich by Granular Mold

Descriptive Note : Rept. for Sep 91-Aug 93,

Corporate Author : NAVAL AIR WARFARE CENTER AIRCRAFT DIV WARMINSTER PA

Personal Author(s) : Ray, Hemen

PDF Url : ADA306122

Report Date : DEC 1993

Pagination or Media Count : 38

Abstract : Although the sandwich panels fabricated of honeycomb core bonded between two face-sheets are very weight-efficient, their application causes many problems such as moisture retention, extensive corrosion, ineffective edge seals, unbonding of face-sheets, and time consuming and expensive repair. In an attempt to eliminate these detrimental factors, new sandwich structural concepts ard their fabrication methods are introduced. These structural concepts include offset-corrugated, and cross-corrugated sandwich. They are variations of corrugated sandwich. The new features of all the sandwich are the provision of passageways from cell to cell for moisture drainage to reduce corrosion, and they can be fabricated of fiber-reinforced composite materials in single cure operation without any secondary bonding. Sample specimens of unidirectionally-corrugated, offset-corrugated, and cross-corrugated composite sandwich have been fabricated by utilizing granular mold mixture. The mold mixture is environmentally safe, non-toxic, non-reactive, and reusable. (AN)

Descriptors :   *FIBER REINFORCED COMPOSITES, *SANDWICH PANELS, STRUCTURAL PROPERTIES, POWDERS, STRUCTURAL ANALYSIS, FABRICATION, CORROSION INHIBITION, COMPOSITE STRUCTURES, GLASS, MIXTURES, LIGHTWEIGHT, CURING, TOLERANCES(MECHANICS), GRANULAR MATERIALS, SANDWICH CONSTRUCTION, HONEYCOMB CORES, TETRAFLUOROETHYLENE RESINS, MOLDS(FORMS), MOISTUREPROOFING, CORRUGATING, PHOTOMICROGRAPHY.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE