Hyperelastic Materials—Creo Ansys Simulation
Hyperelastic materials such as rubber are nonlinear materials that exhibit instantaneous elastic response to large strains. You can create and edit hypereleastic materials to study large deformation in a model. Select Hyperelastic as the Stress-Strain type on the Structure tab of Material Definition dialog box, to define a hyperelastic material. When defining hyperelastic materials you must be aware of the following:
• Modal studies cannot be run for models that have hyperelastic materials assigned.
• Set the value of Large Deflection to On on the Solver Settings dialog box to run a study on a model that is assigned a hyperelastic material.
• Hyperelastic material must not be assigned to beams. The study check fails as this is not supported.
• Only the Neo-Hookean material model is supported in Creo Ansys Simulation. Hyperelastic materials created using any other material model are not supported and studies cannot run.
• Shells and shell pairs can be assigned elastoplastic materials but they must be planar, parallel shells that are aligned with the axis of a coordinate system.
To Create a Hyperelastic Material
1. Click 
on the Materials dialog box.
on the Materials dialog box.2. Specify the Name of the material. If you want, you can write a short Description of the material.
3. Select Isotropic as a Material Type on the Structural tab of the Material Definition dialog box.
4. Select Hyperelastic as a sub type on the Structural tab of the Material Definition dialog box. The dialog box displays the Material Model area.
5. The Define By Tests check box is selected by default. Clear the Define By Tests check box on the Material Definition dialog box.
6. Select the Neo-Hookean material model from the list in the Material Model area.
7. Specify the values of coefficients for the selected material model.
8. Specify the Coeff. of Thermal Expansion on the Structural tab of the Material Definition dialog box.
9. Specify the material properties using other tabs of the Material Definition dialog box.
10. Click Save To Model on the Material Definition dialog box. The material you created appears in the Materials in Model list on the Materials dialog box.
To Create a Hyperelastic Material Using Tests
1. Click on the Materials dialog box.
on the Materials dialog box.2. Specify the Name of the material. If you want, you can write a short Description of the material.
3. Select Isotropic as a Material Type on the Structural tab of the Material Definition dialog box.
4. Select Hyperelastic as a Sub Type on the Structural tab of the Material Definition dialog box. The dialog box displays Material Model area. The Define By Tests check box is selected by default.
5. Click Editto create a hyperelastic material using experimental data for stress and strain. The Hyperelastic Material Definition dialog box opens.
6. Select > or click 
on the Hyperelastic Material Definition dialog box to import an ASCII file containing the stress-strain data. Otherwise, specify the stress and strain values in the table.
on the Hyperelastic Material Definition dialog box to import an ASCII file containing the stress-strain data. Otherwise, specify the stress and strain values in the table.A plot of the stress-strain data is displayed in the graph area.
7. Clear the Use Best Fit Coefficients check box and specify the values of coefficients for the material model.
See the topic “Neo-Hookean” in the Related Links at the end of this topic.
8. Select the Neo-Hookean check box in the Show Best Fit Material Model Curves area.
9. Select Neo-Hookean as the material model in the Select Material Model area. The graph area displays the best fit curve for the selected material model.
Refer to the related topic “Tests for Hyperelastic Material Definition” for more information about the values of stress and strain.