Accession Number : AD0475171

Title :   DEVELOPMENT OF NONDESTRUCTIVE METHODS FOR THE EVALUATION OF ORGANIC NON-METALLIC MATERIALS.

Descriptive Note : Annual rept. 1 Jul 64-31 May 65,

Corporate Author : AVCO CORP WILMINGTON MA RESEARCH AND ADVANCED DEVELOPMENT DIV

Personal Author(s) : Zurbrick, J. R. ; Chiklis, C. K.

Report Date : OCT 1965

Pagination or Media Count : 188

Abstract : Organic nonmetallic materials are finding wider utilization in critical aerospace hardware components and demands upon them for maximum reliability have increased accordingly. At the same time, methods for the nondestructive measurement of the factors contributing to reliability in metallics, primarily the detection and identification of discontinuities, have been refined to a high level of sophistication. Although no such refinement of defect detection in organic nonmetallics has been attained, the elimination of defects would not necessarily solve the over-all reliability problem with organic nonmetallic materials. Premature failures do occur in defect-free components from unpredictable reductions in mechanical or physical properties. The goal set forth within the scope of this contract was to identify and develop those nondestructive test methods and techniques which are applicable to the discontinuity and materials property evaluation of organic nonmetallic materials. The approach to attaining this goal, reported in this document, was to identify, for five important aerospace applications, the materials properties, influencing materials variables, and energy-materials interactions associated with them. With this as a basis, the ultrasonic, dielectric-low frequency, dielectric-microwave frequency, penetrating radiation, and infra-red NDT methods were determined applicable to organic nonmetallics. (Author)

Descriptors :   *PLASTICS), (*NONDESTRUCTIVE TESTING, ULTRASONIC RADIATION, EPOXY RESINS, PHENOLIC PLASTICS, AEROSPACE CRAFT, DIELECTRIC PROPERTIES, TENSILE PROPERTIES, SHEAR STRESSES, CAPACITANCE, DENSITY, DIELECTRICS, PROBES, STRESSES, STRAIN(MECHANICS), CARBONATES, HARDNESS.

Subject Categories : Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE