The Magnetostriction interface (
) combines Solid Mechanics and Magnetic Fields together with the constitutive relationships required to model magnetostrictive materials and devices. Both the direct and inverse magnetostriction effects can be modeled.
When a predefined Magnetostriction interface is added from the
Structural Mechanics branch (
) of the
Model Wizard or from
Add Physics windows,
Solid Mechanics and
Magnetic Fields interfaces are added to the Model Builder.
In addition, the Multiphysics node is added, which automatically includes the multiphysics coupling feature
Magnetostriction.
The participating Solid Mechanics interface includes the default
Magnetostrictive Material feature with its selection set to all domains. The
Magnetic Fields interface gets a default
Ampère’s Law, Magnetostrictive feature with similar settings.
The Magnetostriction multiphysics coupling node can be active only on the selection, where both features Magnetostrictive Material and Ampère’s Law, Magnetostrictive are active.
In 2D and 2D axial symmetry, adding a Magnetostriction 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 nonisotropic magnetostrictive materials.
When physics interfaces are added using the predefined couplings, for example Magnetostriction, specific settings are included with the physics interfaces and the coupling features.
For example, if both Solid Mechanics and
Magnetic Fields interfaces are added, COMSOL Multiphysics adds an empty
Multiphysics node. You can choose the available coupling feature
Magnetostriction but the modified settings are not included.
The Magnetostriction 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. Mechanical Damping and
Thermal Expansion subnodes are available for Magnetostrictive Material under the Solid Mechanics interface. The
Ampère’s Law, Magnetostrictive feature is described for the Magnetic Fields interface.