Defining a Ramberg-Osgood model

The Ramberg-Osgood model is based on the observation that the stress versus plastic strain response is linear when plotted in the logarithmic scale. The total strain is decomposed into the elastic and plastic component.

  1. From the menu bar in the Edit Material dialog box, select Mechanical Plasticity Correction .

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

  2. Select the Definition as Ramberg-Osgood to define this plastic response for the evaluation of the plasticity correction.
  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. Enter the following data in the Data table:

    K, n

    Material constants K,n.

    Temp

    Temperature.

    Field n

    Predefined field variables.

    You can 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 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).