General Mechanical

General Mechanical

How to model a compression-only support with displacement constraints?

    • asierog
      Subscriber

      Hello, I am trying to do a Modal Analysis of a 500k element model. In the begining the model had some frictionless contact that had to be changed by No-Separation contacts. The model also has fixed supports and compression only supports. I tried to solve the model but it was impossible, so I decided to change the compression only supports for displacement constraints, setting X,Y free and Z=0, but I know they aren´t equal. Does it exist some way to model a compression-only support with displacement constraints, or is it possible to solve the model using compression only support?

      Thank you in advance,

      A.O.G.

    • John Doyle
      Ansys Employee
      The compression only support is simulated using a rigid-flex contact pair under the hood. The contact surface will not penetrate across the rigid target, but is free to separate. It should be in a closed and sliding status. For the modal, it should be reduced to its linear equivalent, which would be no-separation. I think your manually defined displacement constraints do same thing, assuming Z is normal to the compression only surface.

    • asierog
      Subscriber
      Thank you very much Regards from Spain
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