General Mechanical

General Mechanical

Error: An internal solution magnitude limit was exceeded

    • Nguyen Van Toan
      Subscriber

      Hello everyone,

      I'm simulating deformation of a rod fixed by both ends. The loads are thermal and gravity. The material is nonlinear. There is no contact surface but I got the message as shown below. How can I solve it?

      Thank you so much !

    • peteroznewman
      Subscriber
      You have not provided enough information to determine why there is an excessive deformation.
    • Nguyen Van Toan
      Subscriber

    • Nguyen Van Toan
      Subscriber
      @peteroznewman
      I am sorry. There are some more details:
      Geometry : Diameter of 2mm; length of 100mm.
      Zero thermal expansion at 20 Celcius.
      Plastic stress-strain, thermal load and coefficient of thermal expansion are shown in the figure below.
      Thank you so much!


    • Erik Kostson
      Ansys Employee
      Hi

      Can you do the following:

      Use linear material, and no large deflections, and only gravity (no thermal loads) and see if that runs.
      Same as 2., but add large deflections.
      Same as 3., and add add NL material.
      Same as 4., and add thermal loads.
      Let us know the outcome of this and we will give some more feedback.

      Thank you

      Erik
    • Nguyen Van Toan
      Subscriber
      @ekostson
      Yes. I have peformed all cases you told me. For cases 1,2,3 they normaly worked. Only something wrong for last case as I asked you before.
    • Erik Kostson
      Ansys Employee
      Thanks for that - so do the following now.

      Same as 4 so use all loads (thermal+structural), but use linear material (no plasticity) and no large deflections.
      Same as above but add large deflections (keep linear material).

      Try that and let me know how it goes

      Erik
    • Erik Kostson
      Ansys Employee
      Did this example with some info from your post:

      Have 2 steps, one gravity, and the second one, gravity + thermal load.

      As I told you in a previous post we do get some buckling/instability and plasticity so that is why it is tricky to solve.

      So use the following settings for the tricky 2nd step and that does it:

      All the best

      Erik
    • Nguyen Van Toan
      Subscriber
      @ekostson
      I will do that with your guidance. Thank you so much again.
    • Erik Kostson
      Ansys Employee
      OK all the best

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