Demagnetization Indication Model Reference


Model Name	Demagnetization Indication
Theory	See Permanent Magnet Knee Point Flux Density.
Provided By	[physics continuum] > Models > Optional Models
Example Node Path	Continua > Physics 1 > Models > Demagnetization Indication
Requires	Space: one of Two Dimensional, Three Dimensional, Axisymmetric Time: one of Steady, Implicit Unsteady Material: one of Solid, Multi-Component Solid > Multi-Part Solid Optional Models: Electromagnetism Electromagnetism: one of Finite Element Magnetic Vector Potential, Finite Volume Magnetic Vector Potential, Transverse Magnetic Potential Optional Models: Permanent Magnet
Activates	Material Properties	See Material Properties.
	Field Functions	See Field Functions.

Material Properties

Knee Point Flux Density

The knee point flux density ( $B_{k}$ in Eqn. (4355)) is the value of the flux density inside a permanent magnet below which the demagnetization process becomes irreversible. See Permanent Magnet Knee Point Flux Density.

The material database allows you to store the knee point flux density for any material. See Modeling Permanent Magnets.

Method	Corresponding Method Node
Constant, Field Function Allows you to specify $B_{k}$ using a constant value or a field function.	Knee Point Flux Density > Constant, Field Function Specifies $B_{k}$ as a scalar profile.
Temperature Adjusted Allows you to specify $B_{k}$ for a particular temperature. The value of $B_{k}$ is calculated based on the intrinsic coercivity $H_{c i} (T)$ of the material. This method is available when an energy model is activated in the physics continuum, as the magnet material is sensitive to temperature change. The value of $B_{k}$ depends on the intrinsic coercivity $H_{c i} (T)$ , when this is known. If $H_{c i} (T)$ is not known, consider using the Constant method. See Eqn. (4356).	Temperature Adjusted Specifies $B_{k}$ through the following properties: Value—specifies $B_{k}$ in Tesla for the given reference temperature. Reference Temperature—specifies the temperature of the material.
Table(T) Allows you to specify $B_{k}$ as a function of temperature, by table entry.	Knee Point Flux Density > Table(T) > Table(T) Specifies $B_{k}$ as a scalar profile.

Field Functions

Knee Point Flux Density: Corresponds to $B_{k}$ in Eqn. (4355).
Demagnetizing Flux Density: The difference between the current flux density $B$ and the knee-point flux density $B_{k}$ inside a permanent magnet. See Eqn. (4354).