OOF2: The Manual
Name
Couplings:PyroElectricity — Pyroelectricity
Details
- Property Category: PyroElectricity
-
Parameters:
px
- Crystal X component of polarization contribution due to temperature change. Type: A real number.
py
- Crystal Y component of polarization contribution due to temperature change. Type: A real number.
pz
- Crystal Z component of polarization contribution due to temperature change. Type: A real number.
T0
- Reference temperature. Type: A real number.
coefficient_type
- Interpretation of the p coefficients, constant strain or constant stress. Type: An object from the
ConstancyEnum
enumerated class.
-
Fields:
Temperature
-
Fluxes:
Total_Polarization
Discussion
PyroElectricity
is a coupling property
which, at its simplest, makes a contribution to the Total_Polarization Flux
proportional to the
difference between the local Temperature
Field
and some specified reference temperature,
T0
.
In practice, the picture is more complicated than this. For systems which have elasticity, thermal expansion, and piezoelectricity, users may wish to model the phenomenon of secondary pyroelectricity, in which an effective pyroelectric coupling arises as a result of the interactions of the other three properties, with a coefficient proportional to the product of the other three coefficients.
In OOF2, this effect can be included by adding a
Pyroelectricity
property to your material
and setting the coefficient_type
parameter to
Constant stress
. The additional
("secondary") contribution will be added in automatically.
Note that the property allows users to specify the pyroelectric coefficient at constant strain, also. In this case, OOF2 will assume that the user has fully specified the desired pyroelectric physics, and will not compute a secondary pyroelectric contribution.
A Material
with a PyroElectricity
Property
must also contain an orientation
property
. There is no isotropic
pyroelectricity.