Issue with results

JKL_20609
JKL_20609 Altair Community Member
edited October 2020 in Community Q&A

Hi!

I am performing an axial quasi-static crash test of a crash box. However, the results are not at all plausible. I have checked all the parameters of the material as well as the properties.

Please help! Which parameters should I change in my model?

 

Thank You!

 

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Answers

  • Simon Križnik
    Simon Križnik Altair Community Member
    edited January 2020

    Hi,

     

    The engine file is not included (again). Use Engine File Assistant to easily define control cards. Engine file can be merged with starter on export: check the 'Merge starter and engine file' option so the engine control cards defined will be in the starter file (_0000.rad). Open the _0000.rad file in Textpad or Notepad and ensure that engine control cards are present. 

    Capture.PNG.ab40f9328dbbb6c676feb7ca1e8bf9e4.PNG

     

    It is not obvious how the model is not plausible- do you have experimental tests or previous experience? I can only think of the axial crushing might be too stiff. A geometric imperfection can be introduced with a /RANDOM nodal noise.

     

    There are intersections and penetrations in the contact interface which should be corrected. There are also 10 bad quality elements (negative volume).

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