Fabrication of Lightweight Composite Sandwich by Granular Mold
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1993
- Accession Number
- ADA306122
Entities
People
- Hemen Ray
Organizations
- Naval Air Warfare Center Aircraft Divison