Overview

Ultrasonic images representing the bulk attenuation and velocity of a set of alumina samples were obtained by a pulse-echo contact scanning technique. The samples were taken from larger bodies that were chemically similar but were processed by extrusion or isostatic processing. The crack growth resistance and fracture toughness of the larger bodies were found to vary with processing method and test orientation. The results presented here demonstrate that differences in texture that contribute to variations in structural performance can be revealed by analytic ultrasonic techniques. Stang, David B. and Salem, Jonathan A. and Generazio, Edward R. Glenn Research Center NASA-TM-101478, E-4600, NAS 1.15:101478 RTOP 535-07-01...

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