*USER DEFINED FIELD

Redefine field variables at a material point.

This material option is used to allow the values of field variables at a material point to be redefined within an increment.

There are two approaches for redefining field variables within an increment:

User subroutine–based approach: Redefine the field variables via user subroutine USDFLD in Abaqus/Standard analyses or user subroutine VUSDFLD in Abaqus/Explicit analyses.
Direct approach: Redefine the field variable directly by associating it with a scalar output variable.

If the USER DEFINED FIELD option is used, it must appear within a MATERIAL definition (Material Data Definition).

This page discusses:

Optional parameters
Data lines to define material properties when PROPERTIES is used
Data lines to redefine the field variables when TYPE=SPECIFIED

Optional parameters

PROPERTIES

This parameter applies only to Abaqus/Explicit analyses.

Set this parameter equal to the number of properties being entered. The properties are available for use in user subroutine VUSDFLD.

TYPE

Set TYPE=USER (default) to redefine the field variables in a user subroutine.

Set TYPE=SPECIFIED to redefine the field variables by direct specification.

Data lines to define material properties when PROPERTIES is used

First line

Enter the material properties, eight per line.

Repeat this data line as often as necessary to define all material properties.

Data lines to redefine the field variables when TYPE=SPECIFIED

First line

Predefined field variable number.
Abaqus output variable identifier (scalar values only). The output variable identifers are defined in Abaqus/Standard Output Variable Identifiers and Available Output Variable Keys.

Repeat this data line as often as necessary to define the field variables.