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Thanks a lot everybody

My goal is to model a PZT thin film with an interdigitated structure upon it. Thus I coupled the "MEMS module -> Piezo Solid" application mode together with the "MEMS module -> Conductive Media DC"; with the first in the "unsymmetric, electrostatic" electrical formulation mode (to make it compatible with the conductive media DC application mode, as stated in the manual).

Piezo solid application mode is active only for the piezoelectric material and Conductive media DC only for the electrodes. In order to model the electric contact I placed at this interface the "electric potential" boundary setting, and I used the dependent variable "V" as value.

Now there's no voltage gradient inside, but there's never voltage difference between the electrodes, indipendently of
a) deformation of the structure
b) both electrodes floating or one grounded.


Anybody has an idea about which could be my mistake? It seems weird to me since every piezoelectric MEMS needs at least one electrode. Which is the correct way to model this?


PS: attached you can find my model

Thanks a lot everybody...