Accession Number : AD0720357

Title :   New Techniques in Nondestructive Testing by Acoustical and Exo-electron Emission.

Descriptive Note : Semi-annual progress rept. 1 Mar-31 Aug 69,

Corporate Author : ARIZONA UNIV TUCSON ENGINEERING EXPERIMENT STATION

Personal Author(s) : Chambers,Robert H. ; Hoenig,Stuart A.

Report Date : 31 AUG 1969

Pagination or Media Count : 15

Abstract : During the course of investigating the frequency response of various piezoelectric transducers for use in acoustical emission studies, the need arose for a very wide frequency range acoustical generator. The repor describes the new generator and applies it to the calibration of several quartz and PZT-5 transducers. Nickel wires were fatigued in alternating torsion, in air, to some fraction of their total life. The wires were then heated in argon or carbon dioxide to induce exo-electron emission. Emission occured at temperatures of 400C or less. Typical results are shown.

Descriptors :   (*METALS, *NONDESTRUCTIVE TESTING), EMISSIVITY, FATIGUE(MECHANICS), NOISE GENERATORS, ACOUSTIC PROPERTIES, SECONDARY EMISSION, NICKEL

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE