Energy Absorption too low

Denis Muhra
Denis Muhra Altair Community Member
edited January 2021 in Community Q&A

Hi,

i'm still working on a composite crash attenuator and need your help again. The Simulation now runs fine but i have problems regarding the Energy Absorbtion of the Attenuator. From expierences of other Teams, a layup of 8-12 plies should be enough to absorb the energy in the crash. My Simulation doesn't absorb that much energy. I've tried various parameters in the Type 7 Interface between the Attenuator and the Wall but nothing really increases the absorbtion. 

Do you have any recommendations? I've also thought about defining a self-contact in the attenuator. Do you think this would work?

I have attached the hm and mvw files

Regards

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Answers

  • Rogerio Nakano_21179
    Rogerio Nakano_21179 New Altair Community Member
    edited January 2021

    Hi

    It does not seem you have crossed plies on your laminate.

    Is this the way the design is?

    Regards

  • Denis Muhra
    Denis Muhra Altair Community Member
    edited January 2021

    Hi Rogerio,

    in the Twill Material Card i have defined E1, E2 and the other paramaters used to define the material in both directions as the same, assuming it's a woven fabric. So theoretically there should be some "crossed plies". But i see that the solver could have troubles with that, so i will look into it. Do you have other ideas to define a woven fabric?

     

    I've also tried the self contact now, it already gives better results.

     

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