Mechanical APDL Basic Analysis Guide

4. In the Material Models Available window, double-click on the following options:Nonlinear,Inelastic,
   Rate Independent,Combined Kinematic and Isotropic Hardening Plasticity,von Mises Plasticity.


5. Double-click on Chaboche and Nonlinear Isotropic. A dialog box appears for defining the constants
   for the Chaboche model.


6. Enter the first three constants associated with the Chaboche model (click on the Help button for inform-
   ation on these constants).


7. The Chaboche model allows you to specify more constants. If you choose to specify more constants,
   click on the Add Row button, and enter the next constant.


8. Repeat the previous step for all the remaining Chaboche constants that you want to define.


9. Click on OK. The dialog box closes and another dialog box appears for defining the constants for the
   Nonlinear Isotropic model.


10. Enter the constants associated with the Nonlinear Isotropic model (click on the Help button for information
    on these constants).


11. Click on OK. The dialog box closes. Under Material Model Number 1, the following are listed:Linear
    Isotropic,Chaboche, and Nonlinear Isotropic. You can then edit any of the data (see Example: Editing
    Data in a Material Model (p. 13)).

1.1.4.4.8. Material Model Interface - Miscellaneous Items

Other characteristics of the material model interface are the following:

• Any batch files you use to enter material data will be converted to material models and will appear listed
  in the Material Models Defined window of the Define Material Model Behavior dialog box.


• The material model interface does not import data from the material library discussed in Using Material
  Library Files (p. 15).

1.1.4.5. Using Material Library Files

Although you can define material properties separat ely for each finite element analysis, you can also
store a material property set in an archival material library file, then retrieve the set and reuse it in
multiple analyses. (Each material property set has its own library file.) The material library files also enable
several users to share commonly used material property data.

The material library feature offers you other advantages:

• Because the archived contents of material library files are reusable, you can use them to define other,
  similar material property sets quickly and with fewer errors. For example, suppose that you have
  defined material properties for one grade of steel and want to create a material property set for an-
  other grade of steel that is slightly different. You can write the existing steel material property set to
  a material library file, read it back in under a different material number, and then make the minor
  changes needed to define properties for the second type of steel.


• Using the /MPLIB command (Main Menu> Preprocessor> Material Props> Material Library> Library
  Path), you can define a material library read and write path. Doing this allows you to protect your
  material data resources in a read-only archive, while giving users the ability to write their material
  data locally without switching paths.

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Building the Model