Abstract

This paper treats the development of thickness-dilational acoustic transients in mechanically free piezoelectric plates. In particular, the effects of external electrical loading circuitry are studied. These effects are most pronounced under short-circuit conditions. In a short-circuited voltage-step excited plate, stress and current responses consist initially of alternating exponential pulses. These, in an unexpected manner, decay to a sine wave accompanied by a sequence of sharp spikes. The sinusoidal and the spike system are characterized by different periods. A small signal theory for lossless materials is presented and supported by experiments with plates made of quartz and lead titanate-zirconate. The arrangement is useful for dynamic measurement of piezoelectric constants.

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