LS Dyna

LS Dyna

Topics relate to LS-DYNA, Autodyn, Explicit STR and more

No chips when coring

    • javat33489
      Subscriber

      Hi everybody.

      I can't get a chip. Elements are killed, although I forbade it in the settings. Who can help me? I have been suffering for a long time. Can't find this error. Everything else works like clockwork. What else can I show you? I can attach the archive if anyone can help.

      Here is the contact I am using:

      ANIMATION

    • Andreas Koutras
      Ansys Employee

      Hello, those elements are deleted because their volume becomes negative. If those elements were not deleted, error termination would occur as soon as a negative volume element was detected. Element erosion due to negative volume is controlled by the ERODE and DTMIN fields of *CONTROL_TIMESTEP and *CONTROL_TERMINATION respectively, or the PSFAIL field of *CONTROL_SOLID. 

      • javat33489
        Subscriber

        Thank you.

        Yes, this is a very popular answer. I tested with these features enabled and disabled. There are still negative volumes and no chips. I've been doing this for a very long time and have tried everything.

        My only hope is for a professional to look at my file and tell me where the problem was.

    • Andreas Koutras
      Ansys Employee

      What element type and material model are using? 

      Does your material include failure?

      • javat33489
        Subscriber

        Everything is fine with the material. I tested it on the simplest model:

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