Application of Nondestructive Testing Techniques for Evaluating and Characterizing Graphite and Ceramic Materials.

摘要

NDT techniques which have proved to be effective for monitoring and measuring such properties as density and modulus were applied to 13 ATJ-S billets. After thorough characterization of properties and mapping of discrete flaw areas,as determined by ultrasonic pulse-echo testing,radiography and alcohol penetrant,the billets were further processed into structures and specimens. Five ATJ-S nose cone structures were fabricated by Battelle Memorial Institute for a Sandia-A.E.C. program and were further characterized at Avco/ATD using NDT techniques. One billet was sectioned and numerous tensile specimens were made as well as specimens for further evaluation and properties analysis. Another ATJ-S billet was sectioned to produce large numbers of disc-and ring-type specimens for a program at the Air Force Weapons Laboratory,Kirtland AFB,New Mexico. Defect analysis was made using NDT techniques and metallographic evaluation of sectioned specimens. (Author)