Accession Number : AD0875229

Title :   The Development of Nondestructive Methods for the Quantitative Evaluation of Advanced Reinforced Plastic Composites.

Descriptive Note : Final rept. 1 Aug 68-31 Oct 69,

Corporate Author : AVCO GOVERNMENT PRODUCTS GROUP LOWELL MA AVCO APPLIED TECHNOLOGY DIV

Personal Author(s) : Schultz, Arnold W.

Report Date : AUG 1970

Pagination or Media Count : 165

Abstract : This final report documents the completion of the fifth year of a continuing study concerned with the development of nondestructive testing techniques for quantitatively evaluating advance fiber- reinforced plastic composites. Five boron/ epoxy panels, one plain weave carbon/carbon panel, and a 3-D quartz/phenolic ssphere were nondestructively and destructively tested for mechanical properties behavior and physical properties characteristics. It was the purpose of this program to: (a) ESTABLISH PREDICTIVE CORRELATIONS BETWEEN ULTRASONICALLY-DETERMINED MODULUS VALUES AND DESTRUCTIVELY-MEASURED TENSILE, COMPRESSION, FLEXURE AND SHEAR MODULUS AND STRENGTH VALUES FOR THE 2-D composites; (b) relate 2- D and 3-D ultrasonic polar modulus values with apreviously-derived micro-mechanics- based theory for generating polar modulus values; (c) demonstrate the feasibility of applying a recently-conceived 6Interval Velocity Technique6 to reinfroced composites; (d) demonstrate the capability of a nondestructive, multiple-energy, gamma- ray radiometric technique for predicting mixture concentrations in boron/epoxy composites; and (e) investigate the use of width-and across-ply measurements of ultrasonic velocity for predicting the mechanical modes of failure occurring in composite test specimens. (Author, modified-PL)

Descriptors :   *NONDESTRUCTIVE TESTING), (*REINFORCED PLASTICS, GAMMA RAYS, ULTRASONIC RADIATION, EPOXY RESINS, COMPOSITE MATERIALS, BORON, CARBON FIBERS, PHENOLIC PLASTICS, RADIOMETERS, MECHANICAL PROPERTIES, PHYSICAL PROPERTIES.

Subject Categories : Laminates and Composite Materials
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE