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Ultrasonic Studies Of The Nonlinear Properties And Of The Deformation Of Solids. Part II

Report Number: AFML TR 65-56 Part 2
Author(s): Hikata, Akira; Sewell, Frank A., Jr.; Chick, Bruce B.; Elbaum, Charles
Corporate Author: Brown Univ Providence RI Metals Research Lab
Laboratory: Air Force Materials Laboratory
Date of Publication: 1966-06
Pages: 82
Contract: AF 33(657)-8324
Project: 7360
Task: 736002
AD Number: AD0802089

Abstract:
The report covers research on the nonlinear properties of solids, with special emphasis on the role of dislocations in harmonic generation, the effects of plastic deformation and dislocation interactions with point defects. Dislocation breakaway from pinning points was considered as a possible source of harmonic generation; this contribution is of the same sign as that from screw dislocations. Experiments were carried out on aluminum single crystals with several different impurity contents, as measured by electrical resistivity ratios R(300 K)/R(4.2 K) ranging from 270 to 3100. Amplitudes of the third harmonic, as well as the attenuation of the fundamental wave, were measured as a function of bias stress, amplitude of the fundamental wave and amount of plastic deformation. The results of these experiments are consistent with the qualitative predictions of the theory presented.

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