Mechanical APDL Basic Analysis Guide - Ansys
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Mechanical APDL Basic Analysis Guide - Ansys

Mechanical APDL Basic Analysis Guide - Ansys Mechanical APDL Basic Analysis Guide - Ansys

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Chapter 1: Getting Started with ANSYS • Graph: Displays a graph of the current data in the ANSYS Graphics window. If required, you can change the data in the table and click on the Graph button again before clicking on the OK button. • OK: Commits all data that you have entered to the ANSYS database and removes this dialog box[1 (p. 12)]. Material Model Number # appears in the Material Models Defined tree structure window, where # = 1 for the first model, or the number that you specified in the Define Material ID dialog box. • Cancel: Cancels all data entered, and removes the dialog box[1 (p. 12)]. • Help: Displays help information that is specific to the particular material property or material constant. 1. Click on OK or Cancel to remove the data input dialog box. Pressing the Enter key will not remove the dialog box. If a button appears, but is grayed out, then the function is defined for the particular material property, but you have not yet entered enough data for the function to become active. Some material data input dialog boxes may include other buttons or interaction components that are necessary for completely defining a material property or model. See A Dialog Box and Its Components in the Operations Guide if you need help on the use of any of these interaction components. Considerations for a Structural Analysis When performing a structural analysis, several inelastic material models (listed by double-clicking on the following in the tree structure: Structural, Nonlinear, Inelastic) require you to input values for elastic material properties (elastic modulus and/or Poisson's ratio) in addition to the inelastic constants that are specific to the model (for example, Yield Stress and Tangent Modulus for the Bilinear Isotropic Hardening model). In these instances, you must enter the elastic material properties before you enter the inelastic constants. If you try to enter the inelastic constants first, a Note appears stating that you must first enter the elastic properties. After you click on OK in the Note, a data input dialog box appears that prompts you for the elastic material properties. After you enter these properties and click on OK, another data input dialog box appears that prompts you for the inelastic constants associated with the specific model you chose. 1.1.4.4.4. Logging/Editing Material Data The Material Models Defined window (the left window in the Define Material Model Behavior dialog box) displays a log of each material model you have specified. After you have chosen OK in the data input dialog box, this window displays a folder icon, and Material Model Number # (the first # is 1 by default), followed by the properties defined for this model. You can define additional models with unique numbers by choosing Material> New Model, then typing a new number in the Define Material ID dialog box. If you double-click on any material model or property (furthest to the right in the tree), the associated data input dialog box appears where you can edit the data, if you choose. 1.1.4.4.5. Example: Defining a Single Material Model This example and the following two examples show typical uses of the material model interface for use in structural analyses. If your specialty or interest is in performing analyses other than structural analyses, it is recommended that you still read and perform these examples to become familiar with maneuvering within the material model interface. You are then encouraged to try one of your own problems in your particular discipline, or try one of the many sample problems presented throughout the various ANSYS analysis guides. Here is a sampling of these problems: • Performing a Steady-State Thermal Analysis (GUI Method) in the Thermal Analysis Guide. • Example of a Current-Carrying Conductor in the Low-Frequency Electromagnetic Analysis Guide. • Example problems in the High-Frequency Electromagnetic Analysis Guide. • Example: Structural-Thermal Harmonic Analysis in the Coupled-Field Analysis Guide. 12 Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates.

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 ANSYS 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 ANSYS 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 Nonlinear Isotropic Hardening in the Element 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 interface. It assumes that you have completed the previous example (see Example: Defining a Single Material Model (p. 12)), and that the completed material model is listed in the Material Models Defined window. Editing data typically falls into two general categories: changing data within an existing material property, and copying an entire material property set to form another model with slightly different properties. Consider a case where you need to change the constants that you assigned to the Nonlinear Isotropic model. To perform this task: 1. Double-click on Nonlinear Isotropic. The associated dialog box appears with the existing data displayed in the fields. 2. Edit the constants in the appropriate fields, and click on OK. Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information of ANSYS, Inc. and its subsidiaries and affiliates. Material Favorites Folder 13

Chapter 1: Getting Started with ANSYS<br />

• Graph: Displays a graph of the current data in the ANSYS Graphics window. If required, you can change<br />

the data in the table and click on the Graph button again before clicking on the OK button.<br />

• OK: Commits all data that you have entered to the ANSYS database and removes this dialog box[1 (p. 12)].<br />

Material Model Number # appears in the Material Models Defined tree structure window, where # =<br />

1 for the first model, or the number that you specified in the Define Material ID dialog box.<br />

• Cancel: Cancels all data entered, and removes the dialog box[1 (p. 12)].<br />

• Help: Displays help information that is specific to the particular material property or material constant.<br />

1. Click on OK or Cancel to remove the data input dialog box. Pressing the Enter key will not remove the<br />

dialog box.<br />

If a button appears, but is grayed out, then the function is defined for the particular material property, but<br />

you have not yet entered enough data for the function to become active.<br />

Some material data input dialog boxes may include other buttons or interaction components that are necessary<br />

for completely defining a material property or model. See A Dialog Box and Its Components in the<br />

Operations <strong>Guide</strong> if you need help on the use of any of these interaction components.<br />

Considerations for a Structural <strong>Analysis</strong><br />

When performing a structural analysis, several inelastic material models (listed by double-clicking on the<br />

following in the tree structure: Structural, Nonlinear, Inelastic) require you to input values for elastic material<br />

properties (elastic modulus and/or Poisson's ratio) in addition to the inelastic constants that are specific to<br />

the model (for example, Yield Stress and Tangent Modulus for the Bilinear Isotropic Hardening model). In<br />

these instances, you must enter the elastic material properties before you enter the inelastic constants. If<br />

you try to enter the inelastic constants first, a Note appears stating that you must first enter the elastic<br />

properties. After you click on OK in the Note, a data input dialog box appears that prompts you for the<br />

elastic material properties. After you enter these properties and click on OK, another data input dialog box<br />

appears that prompts you for the inelastic constants associated with the specific model you chose.<br />

1.1.4.4.4. Logging/Editing Material Data<br />

The Material Models Defined window (the left window in the Define Material Model Behavior dialog<br />

box) displays a log of each material model you have specified. After you have chosen OK in the data input<br />

dialog box, this window displays a folder icon, and Material Model Number # (the first # is 1 by default),<br />

followed by the properties defined for this model. You can define additional models with unique numbers<br />

by choosing Material> New Model, then typing a new number in the Define Material ID dialog box. If you<br />

double-click on any material model or property (furthest to the right in the tree), the associated data input<br />

dialog box appears where you can edit the data, if you choose.<br />

1.1.4.4.5. Example: Defining a Single Material Model<br />

This example and the following two examples show typical uses of the material model interface for use in<br />

structural analyses. If your specialty or interest is in performing analyses other than structural analyses, it is<br />

recommended that you still read and perform these examples to become familiar with maneuvering within<br />

the material model interface. You are then encouraged to try one of your own problems in your particular<br />

discipline, or try one of the many sample problems presented throughout the various ANSYS analysis guides.<br />

Here is a sampling of these problems:<br />

• Performing a Steady-State Thermal <strong>Analysis</strong> (GUI Method) in the Thermal <strong>Analysis</strong> <strong>Guide</strong>.<br />

• Example of a Current-Carrying Conductor in the Low-Frequency Electromagnetic <strong>Analysis</strong> <strong>Guide</strong>.<br />

• Example problems in the High-Frequency Electromagnetic <strong>Analysis</strong> <strong>Guide</strong>.<br />

• Example: Structural-Thermal Harmonic <strong>Analysis</strong> in the Coupled-Field <strong>Analysis</strong> <strong>Guide</strong>.<br />

12<br />

Release 13.0 - © SAS IP, Inc. All rights reserved. - Contains proprietary and confidential information<br />

of ANSYS, Inc. and its subsidiaries and affiliates.

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