Understanding piezoelectric power formulas for a square wave pulse

I'm coming from a geology standpoint here, so bear with me...my goal is to measure some of the physical characteristicsof various earth materials (sands, gravels, clays, etc.) by pulsing a piezoelement into one end of a 3” diameter cylinder of material sample, andmeasuring the reaction (attenuation of the signal) at the other end (with a second piezo). The firststep is to set up the single piezo element that will be providing thepulses.

How do I calculate the maximum frequency vs. voltage vs. current that it can withstand without breaking down ?