Consider a piezo material, say quartz. It produces electric charges when deformed. Suppose a static force is applied to it, which results is charges on two surfaces. If these charges are drained away but the force (and hence the deformation) is not removed, then will the piezo produces charges again on the surfaces?
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A piezoelectric material does not "produce charges".
The strain causes charges to shift within its structure, creating an electric field that can be sensed externally. For example, you can put electrodes on either side of the material; the field will cause charges to shift from one electrode to the other through an external circuit.
If you short the two electrodes together, you simply create another field that opposes the original one, and this eliminates the voltage difference between the electrodes. After that, nothing further happens until the strain on the material changes again.
Dave Tweed
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