The Piezoelectric Material node defines the piezoelectric material properties either in stress-charge form using the elasticity matrix and the coupling matrix, or in strain-charge form using the compliance matrix and the coupling matrix. It is normally used together with a
Piezoelectric Effect multiphysics coupling node and a corresponding
Charge Conservation, Piezoelectric node in the
Electrostatics interface. This node is added by default to the
Solid Mechanics interface when adding a
Piezoelectricity interface.
Piezoelectric Material available for 3D, 2D, and 2D axisymmetry.
By adding the following subnodes to the Piezoelectric Material node you can incorporate many other effects:
The Piezoelectric Material node is only available with some COMSOL products (see
https://www.comsol.com/products/specifications/).
Select a Constitutive relation —
Stress-charge form or
Strain-charge form. For each of the following, the default uses values
From material. For
User defined enter other values in the matrix or field as needed.
Check the Use multiplicative formulation check box to use a formulation based on the multiplicative decomposition of elastic and inelastic (piezoelectric) strains.
If any material in the model has a temperature dependent mass density, and From material is selected, the
Volume reference temperature list will appear in the
Model Input section. As a default, the value of
Tref is obtained from a
Common model input. You can also select
User defined to enter a value or expression for the reference temperature locally.
Select the Calculate dissipated energy check box as needed to compute the energy dissipation.
Select the Reduced integration check box to reduce the integration points for the weak contribution of the feature. Select a method for
Hourglass stabilization —
Automatic,
Manual, or
None to use in combination with the reduced integration scheme. The default
Automatic stabilization technique is based on the shape function and shape order of the displacement field.
When Shear stabilization is selected, enter a stabilization shear modulus,
Gstb. The value should be in the order of magnitude of the equivalent shear modulus.
When Volumetric stabilization is selected, enter a stabilization bulk modulus,
Kstb. The value should be in the order of magnitude of the equivalent bulk modulus.