RESEARCH TOWARD DEVELOPMENT OF LARGE STRAIN AMPLITUDE TRANSDUCERS FOR SEISMIC MODELLING.
Final rept. 1 Jan-31 Dec 68,
CLEVITE CORP CLEVELAND OHIO ELECTRONIC RESEARCH DIV
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The use of the phase transition from antiferroelectric to ferroelectric in certain ceramic materials was investigated for possible use as a large strain amplitude transducer for seismic modelling. Experiments showed that in most cases the anticipated large strains, which had been observed under static conditions, did not occur rapidly enough when voltage steps were applied. In one composition strains of greater than 0.003 were observed, but at electric field values in excess of 60 kVcm. A mathematical analysis shows that the observed transient stresses produced with PZT-4 transducers agree well with predictions. The lack of anticipated large stress amplitudes using the phase transition transducers is not understood, but may be due to a rate limited process such as nucleation. Radial compression transducers were supplied. These comprised small PZT-4 tubes mounted in the centers of two-foot diameter aluminum plates. The tubes were mounted by pressing into reamed holes, and were bonded with epoxy. Author
- Electrical and Electronic Equipment