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

A. W. Schultz

jan. 1970 · Air Force Materials Laboratory, Air Force Systems Command, United States Air Force

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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).