Defining the isotropic hardening component of a nonlinear isotropic/kinematic hardening model

Create a material model as described in Using a nonlinear isotropic/kinematic cyclic hardening model to define classical metal plasticity.”

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

A Suboption Editor appears.

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

A column labeled Temp appears in the Data table.

To define data that depend on field variables, click the arrows to the right of the Number of field variables field to increase or decrease the number of field variables.

Specify how you want to define the isotropic hardening component:

• Toggle on Use parameters if you want to enter the material parameters of the exponential law.

• Toggle off Use parameters if you want to define the evolution of the yield surface size as a function of the equivalent plastic strain in tabular form.

If you toggled on Use parameters, enter the following data in the Data table:

Equiv Stress

Equivalent stress defining the size of the elastic range at zero plastic strain.

Q-infinity

Isotropic hardening parameter, $Q_{\mathrm{\infty }}$.

Hardening Param b

Isotropic hardening parameter, b.

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.

If you toggled off Use parameters, enter the following data in the Data table:

Equiv Stress

Equivalent stress defining the size of the elastic range.

Equiv Plastic Strain

Equivalent plastic 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.

Click OK to return to the Edit Material dialog box.