Accession Number : AD0679573

Title :   NONDESTRUCTIVE TESTING FOR VOID CONTENT IN GLASS-FILAMENT-WOUND COMPOSITES.

Descriptive Note : Final rept.,

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Walker,B. E. , Jr. ; Ewing,C. T. ; Miller,R. R.

Report Date : 04 OCT 1968

Pagination or Media Count : 19

Abstract : Precise nondestructive methods for void determinations on glass-filament-wound composites in the form of rings and ring segments were tested for feasibility, with particular emphasis on the 0- to 3-volume-% void region. Experimental data related to void content are presented for several possibilities - infrared transmission, backscatter from laser transmission, density measurements, and corona discharge inception. The problems associated with these methods are discussed, and the feasibility of a nondestructive test method for void determinations on rings is demonstrated in comparison with destructive void results. (Author)

Descriptors :   (*COMPOSITE MATERIALS, *NONDESTRUCTIVE TESTING), (*FILAMENT WOUND CONSTRUCTION, NONDESTRUCTIVE TESTING), FEASIBILITY STUDIES, GLASS TEXTILES, EPOXY RESINS, MATHEMATICAL MODELS, DEFECTS(MATERIALS), DENSITY, BETA PARTICLES, BACKSCATTERING, DIELECTRIC PROPERTIES, INFRARED TRANSMITTERS, LASERS, MICROWAVES, ELECTRICAL CORONA, MIXTURES

Subject Categories : Refractory Fibers
      Laminates and Composite Materials
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE