The Ampère’s Law, Magnetostrictive node adds Ampère’s law for the magnetic field in a magnetostrictive material and provides an interface for defining the electric properties. It is normally used as part of Magnetostriction multiphysics interface together with a Magnetostriction multiphysics coupling node and Magnetostrictive Material node in the corresponding Solid Mechanics interface. Ampère’s Law, Magnetostrictive node is added by default to the Magnetic Fields interface when adding a Magnetostriction multiphysics interface. The interface requires the AC/DC Module and at least one of the following modules: Structural Mechanics, MEMS, Acoustics.

This section is described for the Current Conservation feature.

The default Relative permittivity εr (dimensionless) for the media is used From material and defined on the shell domain. For User defined, select Isotropic, Diagonal, Symmetric, or Anisotropic based on the characteristics of the permittivity and then enter values or expressions in the field or matrix.

Specify the constitutive relation that describes the macroscopic properties of the medium (relating the magnetic flux density B and the magnetic field H) for a magnetostrictive material:

where is material magnetization which depends on the magnetic field and mechanical stress; a particular form of this dependency can be specified under the corresponding Magnetostrictive Material node in the Solid Mechanics interface.

Mr is the remanent magnetization (SI unit: A/m). Enter X and Y components. For 3D components, enter X, Y, and Z components.