The Dielectric Loss subnode allows you to model electrical losses in the
Piezoelectric Material. The losses can be prescribed either by using a loss factor for the electrical permittivity, or in the form of dielectric dispersion.
For Loss factor for εS select a
Loss factor for electrical permittivity εS. Select
From material to use the value from the material or select
User defined to enter values or expressions for the loss factor in the associated fields. Select
Symmetric to enter the components of
ηeS in the upper-triangular part of a symmetric 3-by-3 matrix, select
Isotropic to enter a single scalar loss factor, or select
Diagonal. The default values are 0.
For Dispersion enter the
Relaxation time τd, and the
Relative permittivity increment 
in the associated fields. For the latter, you can select
Isotropic,
Diagonal, or
Symmetric matrix input options.
Physics tab with Piezoelectric Material node selected in the model tree:
