Defining a volumetric swelling model

As with the creep laws, volumetric swelling laws are usually complex and are most conveniently specified in user subroutine CREEP. However, you can also enter tabular swelling data in the Edit Material dialog box. See Volumetric swelling behavior, for more information.

  1. From the menu bar in the Edit Material dialog box, select MechanicalPlasticitySwelling.

    (For information on displaying the Edit Material dialog box, see Creating or editing a material.)

  2. Click the arrow to the right of the Law field, and select an option for specifying swelling data:

    • Select Input to enter tabular data in the Edit Material dialog box.

    • Select User-defined to define the swelling behavior in user subroutine CREEP

  3. If you selected Input in Step 2, toggle on Use temperature-dependent data to define data that depend on temperature.

    A column labeled Temp appears in the Data table.

  4. If you selected Input in Step 2, click the arrows to the right of the Number of field variables field to increase or decrease the number of field variables on which the data depend.

  5. If you selected Input in Step 2, enter the following data in the Data table:

    Strain Rate

    Volumetric swelling strain rate.

    Temp

    Temperature.

    Field n

    Predefined field variables.

  6. If desired, select Ratios from the Suboptions menu to define anisotropic swelling. See Defining anisotropic swelling” for details.

  7. Click OK to create the material and to close the Edit Material dialog box. Alternatively, you can select another material behavior to define from the menus in the Edit Material dialog box (see Browsing and modifying material behaviors, for more information).