Contact element overlap

johnhcolejohnhcole
Hello, I have made a model using contact, CCX. When I solve the model the deformed view shows the elements crossing each other. I have tried refining the mesh and swapping the master/slave parts relationship. I have also tried increasing and decreasing the the "slope of pressure-overclosure curve K" an order of magnitude. I haven't been able to stop the elements from overlapping (model attached). Any suggestions as to what else I should try? How much does the overlap (crashing) affect the stress solution or the displacement magnitude solution? Thanks for your help, I appreciate it. jhc

Comments

  • johnhcolejohnhcole
    I had trouble uploading the file so I am attempting that again. jhc

    I got an error message: no data could be found in your post.

    I will try a compressed file. jhc
  • SergioSergio
    I don´t see penetration on your model, could it be that you are postprocessing with the default deformation scale factor (92.1x in this case)? In this way there is penetration, but is a display option. At real deformation (1x) looks like there is no penetration.
  • johnhcolejohnhcole
    I will try the uncompressed file again; didn't work. Maybe the file is too big. jhc
  • johnhcolejohnhcole
    Hi Sergio, thanks for your help.

    Okay then, 1x is the test. I had bee looking at a higher magnification. I usually lower the default magnification. I lowered the magnification to 10x and saw a much slighter overlap. I agree, when I look at 1x there is no visible overlap.

    Thank for your help. jhc
  • johnhcolejohnhcole
    for what it is worth, I realized I did not send my most up to date model. Attached now.

    Thanks again for your help. jhc
  • AndreaAndrea
    edited October 2017
    For my opinion, to understand better the displacements, you must work using cylindrical coordinates. I know that is not possible inside Mecway so you can use CGX postprocessor. See attached radial displacements plot.

    Other aspect is the mesh. More gradual transition could lead to a better results
  • VictorVictor
    Thanks to your request previously, in version 8, you can show cylindrical coordinates by entering the transformation formula in the postprocessor. There's an example for radial displacement in the manual.
  • AndreaAndrea
    edited October 2017
    I will try as soon as possible... thanks.

    PS Now I have to read again the list of new features because they are many
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