Defining hardening parameters for a cap plasticity model

The hardening curve specified for this model interprets yielding in the hydrostatic pressure sense: the hydrostatic pressure yield stress is defined as a tabular function of the volumetric inelastic strain, and, if desired, a function of temperature and other predefined field variables. The range of values for which you define pb should be sufficient to include all values of effective pressure stress that the material will be subjected to during the analysis.

Context:

See Modified Drucker-Prager/Cap model, for more information.

  1. Create a material model as described in Specifying cap plasticity behavior.”

  2. From the Suboptions menu in the Edit Material dialog box, select Cap Hardening.

    A Suboption Editor appears.

  3. Toggle on Use temperature-dependent data to define data that depend on temperature.

    A column labeled Temp appears in the Data table.

  4. 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. In the Data table, enter the following data:

    Yield Stress

    Hydrostatic pressure yield stress. (The initial tabular value must be greater than zero, and values must increase with increasing volumetric inelastic strain.)

    Vol Plas Strain

    Absolute value of the corresponding volumetric inelastic strain.

    Temp

    Temperature.

    Field n

    Predefined field variables.

    You may need to expand the dialog box to see all the columns in the Data table. For detailed information on how to enter data, see Entering tabular data.

  6. Click OK to return to the Edit Material dialog box.