Piezomaterial in ANSYS workbench

[Engy Rashed]

mp,perx,MATID,804.6

Could you please tell me in which unit I should put the permitivity of piezomaterial in commands in ANSYS workbench ??

I am solving an ultrasonic cleaner , trying to know its amplitude of displacement but I get very large numbers I don't know why ?
Anyone can help me in this ?

 

[petb]

SI unit is F/m and dimension M^-1·L^-3·I²·T⁴. Derive what to use according to the consistent unit set that you are using in your analysis.