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Recent content by DanRail

  1. DanRail

    Selecting all nodes in an area

    If you know the number for the area in question I'd still use NSLA. For example if the area in question is area #12: ASEL,S,AREA,,12 NSLA,S,1 (or 0, depending if you want all nodes in the area or only interior nodes). That way you don't have to know the geometry. -Dan
  2. DanRail

    Using Fasteners in ProM

    The generic "unable to mesh" error is frustrating. Try applying or changing mesh controls, not by enough to make a diference in your model, just enough to change things a little. Sometimes that helps.
  3. DanRail

    Alternative Fasteners

    I've used beam elements (point to surface) in FEM Mode for export to Ansys. They seem to work well enough, but you get high stresses at the interface. -Dan
  4. DanRail

    defining a beam section

    You may already be doing this, but it's worth mentioning. While any node in the model can be used for an orientation node, it's sometimes advantageous to use node(s) that are not used for anything but beam orientations. This will let you "rotate" a beam by moving the orientation node(s)...
  5. DanRail

    Duplicate Elements

    This works for shell elements. Turn OFF element outlines. /edge command Then do an eplot. Duplicated elements will show element outlines when you have element outlines turned off. -Dan
  6. DanRail

    Selecting all nodes in an area

    I'm not really familiar with the FITEM commands, but the documentation shows these as commands generated in the log file from performing list commands with picking (elis,p or nlis,p). I opened a simple model and no FITEM commands were generated in the log file for an esel,r,p command, but FITEM...
  7. DanRail

    Beam to Shell Connection

    I typically use short beam elements to simulate bolted connections, not for in-depth analysis of the connection, but to determine the large scale stresses in the structure. Beam4 or Beam44 elements connected to Shell63 elements. Here's the kicker. I just had a situation where I needed to...
  8. DanRail

    Hinge modeling in Ansys

    If you apply only displacement constraints (not rotational) along a straight line, this will act as a hinge with its axis along the line where you applied the constraints. WARNING: If the nodes you are constraining are not in a straight line, this will act like a fixed constraint. -Dan
  9. DanRail

    Weight in ansys

    If there are no frequency or other dynamic considerations for which you really need mass, then I'd just model the table and apply forces.
  10. DanRail

    How to get the displacement under a load bigger than critical load

    This response assumes linear elastic analysis. If you're doing a post-failure plactic analysis then please disregard this post The idea behind bucking failure is that the structure becomes unstable if a load higher than Pcr is applied. If the structure is unstable, then by definition the...
  11. DanRail

    Mirroring Loads and BCs in ANSYS

    Hi, Rather than beating you up for not using symmetry boundary conditions I'll assume that you need to do this or you wouldn't be asking. I run a lot of load cases where the model and SOME loads are symmetrical but other loads are not. There are some old unsupported commands that might help...
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