Mechanical APDL Basic Analysis Guide

• Example problems in the High-Frequency Electromagnetic Analysis Guide.


• Example: Structural-Thermal Harmonic Analysis in the Coupled-Field Analysis Guide.

The first example below is intended to show you how to completely define a single material model. It
steps you through a procedure that uses the material model interface to define a model for simulating
nonlinear isotropic hardening, using the Voce law, in a large strain structural analysis at two temperatures.

1. From the Main Menu, click on the following menu path:Preprocessor> Material Props> Material
   Models. The Define Material Model Behavior dialog box appears.


2. In the Material Models Available window, double-click on the following options:Structural,Linear,
   Elastic,Isotropic. A dialog box appears.


3. Enter values for material properties, as required (EX for elastic modulus, and PRXY for Poisson's ratio).
   Click on OK.Material Model Number 1 properties appear listed in the Material Models Defined window.


4. In the Material Models Available window, double-click on the following options:Nonlinear,Inelastic,
   Rate Independent,Isotropic Hardening Plasticity,von Mises Plasticity,Nonlinear. A dialog box appears
   that includes a table where you can add temperature columns or add rows for material data, as needed
   for your application. Note that the temperature field is grayed out.This is because the program assumes
   a temperature independent application, by default, so you would not need to enter a temperature value.
   Because this example is temperature dependent (involving two temperatures), you must first add another
   temperature column, as described in the next step.


5. Click on the Add Temperature button. A second column appears.


6. Enter the first temperature in the Temperature row and the T1 column.


7. Enter the Voce constants required for the first temperature in the rows under the T1 column (see Non-
   linear Isotropic Hardening in the Material Reference).


8. Enter the second temperature in the Temperature row, and the T2 column.


9. Enter the Voce constants required for the second temperature in the rows under the T2 column.

Note that if you needed to input constants for a third temperature, you would position the cursor

in the Temperature row of the T2 column, then click on the Add Temperature button again.This

would cause a third column to appear.

This material model only requires four constants per temperature. If you were using another model

that allowed more constants, the Add Row button would be active. For those models, the same

functionality is included for adding or inserting rows by using the Add Row (or Add Point) button.

10. Click on OK. The dialog box closes. The properties defined for that material are listed under Material
    Model Number 1.

1.1.4.4.6. Example: Editing Data in a Material Model

This example shows you how to use some of the basic editing features within the material model inter-
face. It assumes that you have completed the previous example (see Example: Defining a Single Mater-
ial Model (p. 12)), and that the completed material model is listed in the Material Models Defined
window.

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Building the Model