damage law in a 1D element

Steven PETROWISTE
Steven PETROWISTE Altair Community Member
edited November 2022 in Community Q&A

Hi guys,

My main concern is that I want to use in Optistruct a 1D element that can be damaged (with a bilinear damage law for instance).


I already perform a test with a CBUSH element and PBUSHT option in PBUSH propertie to use a Force vs Deflection law. It works as expected but... The problem is when I load and unload the CBUSH element it always follow the law. For one deflection you have one coresponding force and that's it.

You can find attached the law that I put in a TABLED1 card to work with PBUSH propertie card --> PBUSHT --> KN_LINE

Do you know if it's possible to "really" damage a CBUSH or if there is an other 1D element type that can be damaged ?

Best regards.

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Answers

  • Steven PETROWISTE
    Steven PETROWISTE Altair Community Member
    edited November 2022

    image

  • Steven PETROWISTE
    Steven PETROWISTE Altair Community Member
    edited November 2022

    And this is the behavior that I get: the continuous blue line is the law that I give, the orange points is loading so at the end of the computation for a 6mm deflection I "break" the spring (4mm maximum deflection). In grey you have the unloading, time travelling spring ^^

    image

  • Adriano_Koga
    Adriano_Koga
    Altair Employee
    edited November 2022

    I don't remember any way of adding a failure to the 1D element.

    PBUSHT is the more generic kind to add this NL behavior. Maybe similar to CGAP/PGAP.

     

    maybe you could work with some multiple loadcases scenario and add some interface, such as a MPC, that you could disconnect from one loadcase to another. Just an idea.

    Or try to work with MODCHG for disabling some elements after the first loadcase.

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