Accession Number : AD0879710

Title :   The Quantitative Significance of Nondestructive Evaluation of Graphite and Ceramic Materials.

Descriptive Note : Final rept. 1 Apr 69-30 Apr 70,

Corporate Author : AVCO CORP LOWELL MA SYSTEMS DIV

Personal Author(s) : Orner, John W.

Report Date : OCT 1970

Pagination or Media Count : 97

Abstract : The objective of the research was to utilize the nondestructive testing (NDT) information, correlations, and techniques developed during previous years for the formulation of an experimental approach for verifying the quantitative significance of nondestructive evaluation of graphite and high temperature ceramic materials intended for aerospace structures and systems. As a part of the program, nondestructive evaluation was carried out on a series of billets of hot pressed diboride compositions of zirconium and hafnium with various additions hot pressed. Two grades of graphite (ATJ and RVA) were investigated to determine the significance of typical defective conditions on the physical behavior of the material. Tensile specimens containing various types of flaws, as determined by nondestructive tests, were broken and the results correlated with the NDT findings. (Author)

Descriptors :   *NONDESTRUCTIVE TESTING), (*GRAPHITE, (*BORIDES, NONDESTRUCTIVE TESTING), (*REFRACTORY MATERIALS, NONDESTRUCTIVE TESTING), DEFECTS(MATERIALS), TENSILE PROPERTIES, RADIOGRAPHY, ULTRASONIC PROPERTIES, DENSITY.

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE