*DIFFUSIVITY

ProductsAbaqus/StandardAbaqus/CAE

TypeModel data

LevelModel

Abaqus/CAEProperty module

Optional parameters

DEPENDENCIES: Set this parameter equal to the number of field variables included in the definition of diffusivity. If this parameter is omitted, the diffusivity is assumed not to depend on any field variables but may still depend on concentration and temperature. See Material data definition for more information.
LAW: Set LAW=GENERAL (default) to choose general mass diffusion behavior. Set LAW=FICK to choose Fick's diffusion law. LAW=FICK and the KAPPA, TYPE=TEMP option are mutually exclusive.
TYPE: Set TYPE=ISO (default) to define isotropic diffusivity. Set TYPE=ORTHO to define orthotropic diffusivity. Set TYPE=ANISO to define fully anisotropic diffusivity.

Data lines to define isotropic diffusivity (TYPE=ISO)

First line

Diffusivity, D. (Units of L²T⁻¹.)
Concentration, c.
Temperature, $θ$ .
First field variable.
Second field variable.
Etc., up to five field variables.

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than five)

Sixth field variable.
Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the diffusivity as a function of concentration, temperature, and other predefined field variables.

Data lines to define orthotropic diffusivity (TYPE=ORTHO)

First line

$D_{11}$ . (Units of L²T⁻¹.)
$D_{22}$ .
$D_{33}$ .
Concentration, c.
Temperature, $θ$ .
First field variable.
Second field variable.
Third field variable

Subsequent lines (only needed if the DEPENDENCIES parameter has a value greater than three)

Fourth field variable.
Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the diffusivity as a function of concentration, temperature, and other predefined field variables.

Data lines to define anisotropic diffusivity (TYPE=ANISO)

First line

$D_{11}$ . (Units of L²T⁻¹.)
$D_{12}$ .
$D_{22}$ .
$D_{13}$ .
$D_{23}$ .
$D_{33}$ .
Concentration, c.
Temperature, $θ$ .

Subsequent lines (only needed if the DEPENDENCIES parameter is used)

First field variable.
Etc., up to eight field variables per line.

Repeat this set of data lines as often as necessary to define the diffusivity as a function of concentration, temperature, and other predefined field variables.