HyperView: How to remove pre-strain/stamping/residual strain from crash analysis

Michael Herve_21439
Michael Herve_21439
Altair Employee
edited April 15 in Altair HyperWorks

When dealing with crash analysis where stamping effect was taken into account, a frequent question is: how to plot only the stress variation coming from the crash analysis, without taking into account the stamping strain?

 

For RADIOSS native animations (Annn) and LS Dyna results, this can be done by changing the reader options before loading the results in HyperView:

 

RADIOSS reader options:

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LS-Dyna reader options:

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If dealing with:

  • RADIOSS h3d (either obtain by background conversion of animations via HvTrans, or as native h3d format)
  • RADIOSS or LS-Dyna femzip files
  • or with PamCrash results,

you need to create a Derived result. You can create it either from a right click anywhere in the model browser:

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or from the ribbon:

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In the expression builder pop-up:

  • set an explicit label for the expression
  • look for the Table Strain, and click on Insert. This will populate a first code in the Expresion section:

image 

  • Just above the Table drop-down list, click on the icon left to Show all in order to expose hidden fields. Then keep Strain as Table and set Frame to Time = 0.000000. Insert an add the “–“ sign between both expression. Then Apply.

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The expression is now available as a contour:

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You can save and leverage your post-processing as a Flexible Report in order to re-use the expression on your other result files.

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