General Mechanical

General Mechanical

Sharp Contact Point

    • Autonewbie
      Subscriber

      Hi I have a case where a sharp part contact with another part with penetration designed... Can we just model the contact at sharp angle or assume there is a tiny radius? It is plastic molding, 0.1mm is fine? Thanks!


       


    • peteroznewman
      Subscriber

      Convergence will be easier to achieve if you put a small radius on the tips and equally small elements facing the tips. Start with a 2D Plane Strain model to have it run faster.  Use two planes of symmetry and model only 1/3 of the circle to make it run even faster. Those suggestions are only useful if the loading is symmetric.

    • Autonewbie
      Subscriber

      If I would like to find out how much is required to remove the inner part, is frictional stress at the contact tool the right stress to look for?


       

    • peteroznewman
      Subscriber

      I don't understand the question. Describe what you want to know in more detail. Between the triangle and ring, which part is stiff and which part is soft/flexible?

    • Autonewbie
      Subscriber

      I missed out some words. I was trying to find out the required force to pull out the inner part from press fit but I found the right output now. 


      However, customer told me that the inner part is come with sharp corner no corner radius...


       


       

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