DEVELOPMENT OF NONDESTRUCTIVE METHODS FOR THE QUANTITATIVE EVALUATION OF GLASS-REINFORCED PLASTICS.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1967
- Accession Number
- AD0815360
Entities
People
- J. R. Zurbrick