The Ferroelectroelasticity Interface
The Ferroelectroelasticity interface (), found under Electromagnetics–Structure Interaction () branch within the Structural Mechanics branch () or the Electromagnetics and Mechanics () branch within the AC/DC branch () when adding a physics interface, combines Solid Mechanics and Electrostatics together with the constitutive relationships required to model nonlinear electromechanical interaction in ferroelectric and piezoelectric materials. Electric polarization in such materials depends nonlinearly on the applied electric field including possible hysteresis and saturation effects. In addition, the polarization and mechanical deformations in such materials can be strongly coupled due to the electrostriction effect.
The Ferroelectroelasticity interface is available for 3D, planar 2D, and axisymmetric 2D geometries.
When this multiphysics interface is added using the Model Wizard, a Solid Mechanics interface and an Electrostatics interface are added to the Model Builder.
In addition, the Multiphysics Couplings node is added, which automatically includes the multiphysics coupling feature Electrostriction.
The participating Electrostatics interface includes the default Charge Conservation, Ferroelectric feature with its selection set to all domains. Such features can be also added manually to any Electrostatics interface in the model.
All structural and electrostatics functionality for modeling is also accessible to include surrounding solids, fluids, or free space. For example, add any material model for other solid domains, a dielectric model for fluid, or a combination.
On the Constituent Physics Interfaces
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The Solid Mechanics interface is described in The Solid Mechanics Interface.
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The Electrostatic interface is described in The Electrostatics Interface in the AC/DC Module User’s Guide.
Settings for Physics Interfaces and Coupling Features
When physics interfaces are added using the predefined couplings, for example Ferroelectroelasticity, specific settings are included with the physics interfaces and the coupling features.
However, if physics interfaces are added one at a time, followed by the coupling features, these modified settings are not automatically included.
For example, if both Solid Mechanics and Electrostatics interfaces are added, COMSOL Multiphysics adds an empty Multiphysics node. You can add the available coupling feature Ferroelectroelasticity but the modified settings are not included.
The Electrostatics interface by default adds the Charge Conservation, Ferroelectric node with its selection set to all domains. This node serves to represent solid ferroelectric material domains. Any number of Charge Conservation in Solids or Charge Conservation in Fluids nodes can be added to the interface.
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Ferroelectroelasticity
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Ferroelectricity
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Modeling Electrostrictive and Ferroelectroelastic Materials
Hysteresis in Piezoelectric Ceramics: Application Library path MEMS_Module/Piezoelectric_Devices/piezoelectric_hysteresis