General Mechanical

General Mechanical

Solid to surface frictional contact

    • adrian92
      Subscriber

      Hi there,


      I was searching for such problem here but did not find what I'm looking for. Basically I want to create a frictional contact between a solid a surface(shell). The case is simple, I heat up the solid and the shell plate, and the press with a force. I don't want to create a bonded contact, because I want to let the surface and solid to "slide" between each other because of the different thermal expansion level. If I make them bonded, they expand with the same magnitude of Directional Deformation, obviously. I think I might make some essential error....


      Thank you in advance!


      Setup:



      After preheating:



      After loading:


    • peteroznewman
      Subscriber

      Insert a Contact Tool into the Connections folder and Evaluate Initial Contact Status. Is the Frictional contact closed?

    • adrian92
      Subscriber

      Hi Peter, no matter if I select symmetric or asymmetric it gives me near open, although I've set the pinball greater than the space between mid-surface and bottom face of the block.


       


      For asymmetric


    • Wenlong
      Ansys Employee

      Hi,


      As Petersnowman suggested, checking the contact status is a good idea when you have an "unable to detect contact problem". Based on the image you shared, your two surfaces are not initially in contact. I would try reducing the "initial step" size and maybe also the minimum step size in the analysis settings, so that the movement within the first substep is not larger than the pinball region. 


      Regards,


      Wenlong


       

    • peteroznewman
      Subscriber

      You can also try Adjust to Touch.


       

    • adrian92
      Subscriber

      Thank you guys for tips! It worked actually with the Adjust to touch method. Contact is closed an it works both in symmetric and asymmetric contact. Now because I have different values of contact pressure I wonder what is the general rule of thumb - for symmetric contact is the net pressure AVG of both and for asymmetric is the true one, or opposite? I was looking for a kind of manual PDF of ansys contacts etc.

    • Wenlong
      Ansys Employee
    • adrian92
      Subscriber

      Thank you Wenlong, thread to be closed.

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