LS Dyna

LS Dyna

LS-DYNA Chip Problem

    • javat33489
      Subscriber

      Hello dear professionals.

      I have another problem, sorry. I need help.

      I am modeling a test model (downloaded from the forum) before moving on to a complex one. The task of drilling a metal plate. The problem is that I don't have shavings. There are no chips with any material, any fracture model. Most likely the problem is not in the material. Help find her. When drilling, the body behaves like a very elastic one:

       

      DOWNLOAD ANIMATION

       

      To explain all the settings is very long, so I attached the K-file DOWNLOAD K-FILE.

      I will be very grateful if you help, I can not find the reason for a very long time.

    • Aniket
      Ansys Employee

      Ansys staff can not download any files on the forum, so if you want to reach a larger audience to get answers from, please insert inline images describing your problem.

      Thanks for your understanding!

      -Aniket

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      Guidelines for Posting on Ansys Learning Forum

      • javat33489
        Subscriber

        OK

    • Andreas Koutras
      Ansys Employee

      Hello,

      Here are some ideas.

      For modeling the drilling process with FEM, you will need to use an ERODING contact, such as *CONTACT_ERODING_SINGLE_SURFACE and also use an appropriate material model (*MAT) that includes failure. For validating your approach, you can start with *MAT_024 in which material failure and subsequent element erosion is controlled by the effective strain at failure FAIL. More complex failure criteria can be also specified with *MAT_ADD_EROSION, *MAT_ADD_DAMAGE DIEM or GISSMO, or *MAT_ADD_GENERALIZED_DAMAGE.  Please look at the corresponding sections in the LS-DYNA manuals.

      I hope this helps.

       

      • javat33489
        Subscriber

        yes, sure! I use both the johnson cook model and the linear polynomial. I have attached pictures of important settings. Please take a look, if you need more pictures, tell me which ones

    • javat33489
      Subscriber

      new images

    • javat33489
      Subscriber

      I was able to achieve a good result, but no chips

    • javat33489
      Subscriber

      Why is the material removed?

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