Accession Number : ADA307656

Title :   Development of a Radio-Frequency Transparent Energy-Absorbing Structural Element.

Descriptive Note : Final rept. 1 Jun 64-31 Jan 65,

Corporate Author : NORTHROP CORP NEWBURY PARK CA VENTURA DIV

Personal Author(s) : Smith, Ronald H.

PDF Url : ADA307656

Report Date : JUL 1965

Pagination or Media Count : 97

Abstract : An experimental investigation has been conducted to develop highly efficient energy absorbing structural elements from radiofrequency transparent materials. The materials were evaluated using two types of energy absorption processes; the fragmenting tube and the crushing of honeycomb and foamed materials. Plastic reinforced glass fabric tubes, employed in the fragmenting tube process, yielded specific energies of 28,400 and 12,300 ft-lb/lb for fabric orientation in the longitudinal and hoop directions respectively. The crushing of nylon phenolic honeycomb yielded a value of specific energy of l4,400 ft-lb/lb for a 3/16 inch cell size, 9.0 lb/ft3 density, and with a usable stroke of 80% of initial length. Radio frequency transmission losses were well within acceptable limits for the specified 100 to 2000 megacycle frequency range investigated.

Descriptors :   *RADOMES, *HONEYCOMB STRUCTURES, *EXPANDED PLASTICS, FRAGMENTATION, TRANSPARENCE, FABRICS, RADIO TRANSMISSION, TRANSMISSION LOSS, FOAM, ENERGY ABSORBERS.

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE