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Recent content by ktop

  1. ktop

    Stress concentration on a curve

    This depends on your model. From the sound of it you modeled the angle with 3D elements. If you had modeled with shell elements what you say would be true because the corner where the two legs come together is a singularity of sorts. But if you did a solid model using 3D element (tets or...
  2. ktop

    Mesh Convergence Issue

    The aspect ratio of the elements near the OD is pretty bad. You can see it in the behavior of the elements near the bottom turning inside out. You might want to try meshing it so that all the "rubber" elements are roughly the same size. KTOP
  3. ktop

    Simulation failure with sandwich modele

    You want to do this in Cosmos/M because it has a laminate shell element. This is not available in CosmosWorks/Simulation AFAIK. KTOP
  4. ktop

    Contact groups

    I am not using the most current CosmosWorks. I am trying to create contact elements between a cylinder and a hole near the edge. The edge of the hole has a small round on it. I have to create two contact groups between the bolt and the hole, one for the hole itself and one for the round on the...
  5. ktop

    Nonlinear modeling of pressure vessel

    You are of course using a shell model for this. The heads of cylindrical vessels frequently will buckle in compression when there is pressure inside. Do a run with a small load and look for circumferential compressive stresses. If this is happening you have to export your model and run it in...
  6. ktop

    Better Alternatives to Simulation/CosmosWorks?

    Noran Engineering has a very good set of products in the CosmosWorks market space. NEiWorks is very similar to CosmosWorks in the user interface department, however, it creates a proper Nastran input deck so you can see what you created and you can use it in higher end analysis. NENastran is...
  7. ktop

    Post Plasticity Analysis Failure

    The first thing I am going to ask is what is your plasticity model? Kinematic, Isotropic or from material curve. It looks like the post yield behavior would suggest a material curve be input as kinematic and isotropic models make a lot of assumptions. Are the locations of yield in your model...
  8. ktop

    Cosmos Struggle - Mesh Control

    Piece of cake. Create a spherical surface on the end of your cylinder in the area of interest. Create a split feature with the surface and keep both bodies. Put a mesh control on the little "scoop of ice cream" that is very fine and put the coarsest mesh you can get away with on the global...

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