In COMSOL Multiphysics, the electrostrictive effect can be modeled using two multiphysics interfaces: Electrostriction and Ferroelectroelasticity. Both interfaces are constituted of one Solid Mechanics and one Electrostatics interface, which are coupled together via an Electrostriction multiphysics feature. However, in case of Ferroelectroelasticity, the corresponding Electrostatics interface will contain a dedicated feature Charge Conservation, Ferroelectric.

The Electrostriction interface electrostatically can be used for modeling electrostatically actuated structures in regimes when the electric polarization can be assumed to vary linear with the applied electric field.

The Ferroelectroelasticity can be used for modeling nonlinear electromechanical interaction in ferroelectric and piezoelectric materials at high applied electric fields. Electric polarization in such materials depends nonlinearly on the applied electric field including possible hysteresis and saturation effects.