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Nonlinear Materials

Hyperelastic materials, such as rubber, are nonlinear materials that exhibit instantaneous elastic response to large strains. Mechanica uses an industry leading material definition UI to bring this complex nonlinear solution capability to non-specialist users.

Mechanica supports several different mathematical models of hyperelastic material. Material properties can be defined by experimental data or using popular material laws such as Arruda-Boyce, Mooney-Rivlin, Neo-Hookean, etc.

 

This functionality covered in this tutorial requires Pro/ENGINEER Advanced Mechanica.

The Working Directory for all the Simulation tutorials is SIMULATION.

  1. Open Open HANGAR.ASM.

 

This model is made up of two steel plates that sandwich some elastic material.  We are going to review the material properties and review the results of this analysis.

hangar.asm

  1. Applications > Mechanica > Continue.

 

This model already has material properties, loading conditions and constraints.  You will first review the material properties for the parts in this assembly.

  1. Click the Materials Material icon on the right toolbar to open the material definition dialog. 
  2. Select Urethane from the list on the right, then RMB > Properties.
  3. Explore this dialog and select Edit button to enter the Hyperelastic Material Definition dialog.  Explore the additional options available. 

 

Currently the material is being defined by a text file called Test1 and you can see the two columns of data on the left side.  The UI is set to select the best fit automatically and has selected the Yeoh material law.

  1. Cancel out of dialog box and OK to confirm.  OK for remainder of open dialogs.
  2. Select Analysis icon to open the Analysis dialog. 
  3. With HANGAR_LDA highlighted, select Edit Edit Study to enter the Static Analysis Definition dialog. 

Analysis Menu

 

Note that the check box for Calculate large deformations is checked.  This is necessary for the nonlinear material definitions to be in effect.

  1. Click OK to exit box.
  2. With HANGAR_LDA highlighted, select the Results Results icon.
  3. Fill out the Result Window Definition dialog box with the following information.  Select OK and Show.
    (use the 'Click to view larger picture button' to expand image)

Result Windows

You should see the following image:

Result window

 

Erasing the barrier separating design and analysis . . . . Unparalleled CAD/CAE Integration!

  1. File > Exit Results > NO and close out of dialog boxes.
  2. Window > Close Close.
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