Using the Johnson-Cook hardening model to define classical metal plasticity

The Johnson-Cook plasticity model is particularly suited to model high-strain-rate deformation of metals. This model is a particular type of Mises plasticity that includes analytical forms of the hardening law and rate dependence. It is generally used in adiabatic transient dynamic analysis. For more information, see Johnson-Cook Plasticity.

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

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

  2. Click the arrow to the right of the Hardening field, and select Johnson-Cook.
  3. Enter the following data in the Data table:

    A, B, n, and m

    Material parameters measured at or below the transition temperature.

    Melting Temp

    Melting temperature, θmelt, above which the material is melted and behaves like a fluid.

    Transition Temp

    Transition temperature, θtransition. There is no temperature dependence on the expression of the yield stress at or below the transition temperature.

    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.

  4. If desired, use the Suboptions menu to enter additional data.

    See the following sections for details:

  5. 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).