The Piezoelectricity interface (
) combines Solid Mechanics and Electrostatics together with the constitutive relationships required to model piezoelectric phenomena. Both the direct and inverse piezoelectric effects can be modeled, and the piezoelectric coupling can be formulated using either the strain-charge or stress-charge forms.
When a predefined Piezoelectricity interface is added from the
Structural Mechanics branch (
) of the
Model Wizard or from
Add Physics windows,
Solid Mechanics and
Electrostatics interfaces are added to the Model Builder.
In addition, the Multiphysics node is added, which automatically includes the multiphysics coupling feature
Piezoelectricity.
The participating Solid Mechanics interface includes the default
Piezoelectric Material feature with its selection set to all domains. The
Electrostatics interface has a default
Charge Conservation, Piezoelectric feature with similar settings.
The Piezoelectricity multiphysics coupling node can be active only on the selection, where both features Piezoelectric Material and Charge Conservation, Piezoelectric are active.
In 2D and 2D axial symmetry, adding a Piezoelectricity interface also adds predefined base-vector coordinate systems for the material’s (in the plane 2D case) XY-,
YZ-,
ZX-,
YX-,
XZ-, and
XY-planes. These additional coordinate systems are useful for simplifying the material orientation for the piezoelectric material.
When physics interfaces are added using the predefined couplings, for example Piezoelectricity, specific settings are included with the physics interfaces and the coupling features.
For example, if both Solid Mechanics and
Electrostatics interfaces are added, COMSOL Multiphysics adds an empty
Multiphysics node. You can choose the available coupling feature
Piezoelectricity but the modified settings are not included.
The Piezoelectricity coupling node is used to couple the interfaces.
Additional nodes and subnodes available with this multiphysics interface are described with the interfaces where they are available. Coupling Loss,
Dielectric Loss,
Mechanical Damping, and
Conduction Loss (Time-Harmonic) subnodes are available for Piezoelectric Material under the Solid Mechanics interface. The
Charge Conservation, Piezoelectric feature is described for the Electrostatics interface.