Defining a creep law

In an Abaqus/Standard analysis, you can define classical deviatoric metal creep behavior in a user subroutine or by providing parameters for the creep laws. You can define creep behavior in user subroutine CREEP.

See Rate-Dependent Plasticity: Creep and Swelling for more information.

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

    (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 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 Ornl from the Suboptions menu to implement the creep rules specified by the Oak Ridge National Laboratory constitutive model. See Using the Oak Ridge National Laboratory (ORNL) constitutive model in plasticity and creep calculations for more information.
  6. If desired, select Potential from the Suboptions menu to specify anisotropic creep behavior. See Defining anisotropic yield and creep for more information.
  7. 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).