Exercise 3: Define Termination and Output for the Head and A-Pillar Impact Analysis

In this tutorial, you will become familiar with defining LS-DYNA control data and output requests in HyperMesh. Also, you will define the termination and output for a LS-DYNA analysis of a hybrid III dummy head impacting an A-pillar.

The head and A-pillar are depicted in Figure 1.


Figure 1.

Load the LS-DYNA User Profile

In this step, you will load the LS-DYNA user profile in HyperMesh.

  1. Start HyperMesh Desktop.
  2. In the User Profile dialog, set the user profile to LsDyna.

Retrieve the HyperMesh File

In this step, you will open the HyperMesh model file.

  1. Open a model file by completing one of the following options:
    • Click File > Open > Model from the menu bar.
    • Click on the Standard toolbar.
  2. In the Open Model dialog, open the head_3.hm file.
The model appears in the graphics area.

Specify the Analysis Stop Time

In this step, you will specify the time you want LS-DYNA to stop the analysis with *CONTROL_TERMINATION.

  1. In the Solver Browser, right-click and select *Create > *CONTROL > *CONTROL_TERMINATION from the context menu.


    Figure 2.
    HyperMesh creates and opens a new control in the Entity Editor.
  2. For ENDTIM (termination time), enter 2.5.

Specify the Output of D3plot Files

In this step, you will specifiy the output of D3plot files with *DATABASE_BINARY_D3PLOT.

  1. In the Solver Browser, right-click and select Create > *DATABASE > *DATABASE_BINARY_D3PLOT from the context menu.
    HyperMesh creates and opens a new database in the Entity Editor.
  2. For DT (time interval between outputs), enter 0.1.

Specify ASCII Output

For this step, you will apecify ASCII output with *DATABASE_(Option) cards.

  1. In the Solver Browser, right-click and select Create > *DATABASE > *DATABASE_OPTION from the context menu.
    HyperMesh creates and opens a new database in the Entity Editor.
  2. Select the GLSTAT checkbox.
  3. For DT, enter 0.1.
    Note: This specifies the output of global data at every 0.1 ms.
  4. Select the MATSUM checkbox.
  5. For DT, enter 0.1.
    Note: This specifies the output of material energies every 0.1 ms.
  6. Select the SPCFORC checkbox.
  7. For DT, enter 0.1.
    Note: This specifies the output of SPC reaction forces every 0.1 ms.

Export the Model

In this step, you will export the model as an LS-DYNA keyword file.

  1. From the menu bar, click File > Export > Solver Deck.
  2. In the Export - Solver Deck tab, set File type to LsDyna.
  3. From the Template list, select the appropriate template.
  4. In the File field, navigate to your working directory and save the file as head_complete.key.
  5. Click Export.

Submit the LS-DYNA Input File

In this step, you will submit the LS-DYNA input file to LS-DYNA 970 for analysis.

  1. From your desktop Start Menu, open the LS-DYNA Manager program.
  2. From the solvers menu, select Start LS-DYNA analysis.
  3. Load the head_complete.key file.
  4. Click OK to start the analysis.

Post-Process the LS-DYNA Results Using HyperView

In this step, you will save your work.

Save your work to a HyperMesh file.