Accession Number : AD0815360

Title :   DEVELOPMENT OF NONDESTRUCTIVE METHODS FOR THE QUANTITATIVE EVALUATION OF GLASS-REINFORCED PLASTICS.

Descriptive Note : Summary technical rept., 1 Jul 65-31 May 66,

Corporate Author : AVCO MISSILES SPACE AND ELECTRONICS GROUP LOWELL MA AVCO SPACE SYSTEMS DIV

Personal Author(s) : Zurbrick, J. R.

Report Date : MAR 1967

Pagination or Media Count : 114

Abstract : Reliability of organic nonmetallic materials for aerospace applications is a serious consideration. Weight and space requirements as well as mechanical properties are important factors in the selection and use of structural components produced from filament wound or laminated fabric reinforced plastics. Applicable nondestructive testing (NDT) techniques can in effect enable end use properties and performance to be predicted with confidence. Five resin systems, epoxy, phenolic, polyester, polybenzimidazole, and silicone, in (181) glass fabric laminates were nondestructively evaluated. They were intentionally varied in resin content to simulate industrial conditions. Correlations were made between a given NDT response and laminate conditions. Gamma radiation gaging using CD 109 was used to measure laminate density. Ultrasonic velocity measurements provided many correlations between physical and mechanical properties for specific resin systems. Experimental moduli were predictable to + or -0.37 X ten to the 6th power psi. Apparent values of both tensile modulus and flexural modulus were affected in the same manner and to the same extent by shear deflections in the resin, between - ply voids, within-ply porosity, and resin content. As a result, it was learned that nondestructive test techniques could be used to clarify material composition/mechanical property uncertainties in reinforced plastics technology. (Author)

Descriptors :   (*NONDESTRUCTIVE TESTING, GLASS TEXTILES), (*LAMINATED PLASTICS, NONDESTRUCTIVE TESTING), BENZIMIDAZOLES, EPOXY RESINS, PHENOLS, POLYESTER PLASTICS, SILICONE PLASTICS, SANDWICH PANELS, TENSILE PROPERTIES, ELONGATION, ELASTIC PROPERTIES, POROSITY, DEFECTS(MATERIALS), DENSITY, AGING(MATERIALS), RADIOGRAPHY, RADIOMETERS, ULTRASONIC RADIATION, DIELECTRIC PROPERTIES, MEASUREMENT, STATISTICAL PROCESSES, EXPERIMENTAL DATA, CADMIUM, RADIOACTIVE ISOTOPES, ULTRASONIC PROPERTIES.

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE