Defining the viscous component of a two-layer viscoplasticity model

The two-layer viscoplasticity model in Abaqus/Standard is useful for modeling materials in which significant time-dependent behavior as well as plasticity is observed. For metals this typically occurs at elevated temperatures.

This model consists of three parts: elastic, plastic, and viscous. You can define the viscous behavior of the material by selecting a creep law and entering viscosity parameters. See Two-Layer Viscoplasticity for more information.

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

    (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 the creep law of your choice. See Viscous Behavior and Creep Behavior for the data required for each creep law.
  3. To define behavior data that depend on temperature, toggle on Use temperature-dependent data.

    A column labeled Temp appears in the Data table.

  4. To define behavior 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.

    Field variable columns appear in the Data table.

  5. If desired, select Potential from the Suboptions menu to define anisotropic viscosity. See Defining anisotropic yield and creep for details.
  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).