Why does the free thermal expansion of a piezoelectric cube produce a large voltage?

This is defect 79830, which has been fixed for 12.0. We do not account for the "thermal strain charge" in our piezoelectric FE formulation. The "thermal strain charge" load Q is similar to the thermal strain force {Fth} we apply as an element load when a temperature body load is applied. This is why we were getting an electrical response to the thermal strain.

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