HIGH POWER MAGNETOSTRICTORS FOR SONAR APPLICATIONS.
Final rept. 1 Jun 59-31 Jul 65,
IIT RESEARCH INST CHICAGO IL
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This report summarizes research on both metallic and ferrite magnetostrictive type transducers. The research was directed toward 1 establishing methods for calculating how a magnetostrictor responds to large amplitude excitation, 2 determining how magnetostrictive elements respond to uniaxial static compressive stresses, 3 investigating the effect of hydrostatic stress on the important magnetostrictive parameters lambda and mu, 4 extending existing theory to include the dissipative forces inside a vibrating magnetostrictor, 5 investigations of the coupled vibrational modes of a ferrite tube magnetostrictor, and 6 investigations of magnetostrictive ferrite transducers for high power sonar applications. The lack of a suitable nonlinear theory for the behavior of magnetostrictors under large amplitude excitations dictated the empirical approach taken. However, throughout the contract limited work was directed, based upon these empirical results, toward the possible formulation of a nonlinear theory. Author