General Mechanical

General Mechanical

Ansys Mechanical doesn’t Detect the Collision

    • Jayden
      Subscriber

      Hi there,

      I'm running a 2 step stent expansion and axial force model. After the stent expansion is complete the axial force is applied to one end of one of the struts to compress it axially with a axial displacement, however as you can see it doesn't detect the collision with the other ring of struts?

      the displacement condition is 1 mm in the x direction with the why and z directions set to free.


      I was wondering why that was and if there was a way to fix it so it detects the collision with the other struts in the next row.


      Thanks.

    • peteroznewman
      Subscriber
      Insert a Frictional Contact under the Connections folder and pick the two faces that are going to collide.nSet the Pinball Radius to a large enough value so that the other face is inside that Radius.nInsert a Contact Tool under the Connections folder and Evaluate Initial Contact Status and confirm that the contact is Near Open and not Far Open.n
    • Jayden
      Subscriber
      Thanks for the reply. nI have done what you suggested and it seems to run through the radial expansion okay however its gets to about this point on the progress bar which would be in the axial compression step but it stays at around this part for hours and doesn't converge. Do you have any suggestions how to make it converge? Previously without the contact its taking about 3-4 hours to solve.nThanks. nn
    • peteroznewman
      Subscriber
      The screen shot shows that the solver is still running, so technically, it hasn't failed to converge, it is still trying.nThere are hundreds of posts on this forum to answer the same question of what to do when an analysis fails to converge.nMembers typically provide more information such as the N-R Force Convergence Plot.nThey will set the Number of N-R Force Residual plots to 3 or more.nWhen contact is involved, they may try changing the Contact Normal Stiffness Factor to a 0.1 to help contact converge.n
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