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Recent content by generaluday

  1. generaluday

    Importing Load Steps from Neutral Files

    Hello, When I map the pressure results from a transient CFD analysis onto an FE mesh in Femap, the CFD package creates one neutral file (with the pressure results interpolated onto the FE mesh as a load case) for each time step, as opposed to creating one load case for each time step in the...
  2. generaluday

    Reaction Moments on Grille Vane

    Oh no, the shaft is not a hollow tube, but I don't know what I was thinking when I was expecting reaction moments on solid element nodes, which do not even have rotational DOFs. The point of the rigid elements connecting a node to the outer shaft surfaces on each end was to completely fix one...
  3. generaluday

    Reaction Moments on Grille Vane

    Well, nevermind the F06 file, but the explanation was certainly helpful. All I had to do was create a node along the axis of the shaft on each end, a little outside the outer shaft surfaces, and connect each node to all the nodes on the outer surfaces using rigid elements, and then constrain...
  4. generaluday

    Reaction Moments on Grille Vane

    I tried everything that you suggested, but nothing worked. I even looked in the F06 file, but found nothing of interest. I even simplified the model to a simple rectangular plate with 2 cylindrical pivots on the opposite faces, fixed the pivots, applied opposing forces on the top and bottom...
  5. generaluday

    Reaction Moments on Grille Vane

    Hello! I'm trying to determine the torque required to hold a grille vane in position when wind at a certain velocity is blowing against it. I obtained the pressure profiles on the vane from a CFD analysis, mapped those results onto an FEA mesh, and solved the analysis. I constrained one end of...
  6. generaluday

    Bulb-Retainer Pull Out Force

    Thanks Blas! It worked. I appreciate your help.
  7. generaluday

    Bulb-Retainer Pull Out Force

    Hello, I'm trying to compute the force required to pull out a bulb from it's retainer in a bulb-holder assembly. The retainer has 2 clips, and as the bulb is pushed into it, the clips move outwards as the base of the bulb slides in the space between the clips, and then back inwards to snap...
  8. generaluday

    Modal Analysis of Tension Cable Connected Structure

    Hello Blas, Thanks a lot for the instructions and ideas. I used to do pre-stressed modal analyses in ANSYS, but I wasn't sure how to do that in Femap. I got in touch with someone in Siemens, and he pretty much gave me the same instructions. I pre-stressed the cables using a bolt preload, and...
  9. generaluday

    Modal Analysis of Tension Cable Connected Structure

    Hello! I'm trying to solve a problem comprising of a simple fuselage with pre-stressed tension cables connecting the arms of the fuselage. I'd like to conduct a modal analysis on this setup. Let's assume that the fuselage comprises of an X-shaped structure with 4 tension cables connecting the...
  10. generaluday

    Obscure FEMAP Errors

    I've been trying to solve the static analysis example of the assembly with the "contact" connection property provided in the femap help system. I have solved this before with success, but below is the list of obscure errors femap throws at me when I try to solve it this time. NX Nastran started...
  11. generaluday

    Modal Analysis of an Assembly

    Also, I read the "Linear Contact in Normal Modes analysis," and, according to namklof's suggestion, changed the "contact" condition to "glued," but that did not work either. The solver just failed. It makes perfect sense that a "contact" problem would call for a non-linear solution, and that...
  12. generaluday

    Modal Analysis of an Assembly

    Hello, I've been trying to conduct a Modal Analysis of a simple assembly (the example assembly provided in the help system) in FEMAP. I tried this on a lamp assembly of my own, and since it didn't work the way I'd anticipated, I thought I'd try it on a simpler assembly first. I just deleted...
  13. generaluday

    Static Non-Linear Analysis (Geometric and Material Non-Linearity)

    Thanks a lot, FEMAP2. I experimented with different stress-strain curves, and figured that out. I wonder why Nastran does not allow the discontinuities/duplicate entries, which most stress-strain curves contain. It's strange. I appreciate your response though!
  14. generaluday

    Static Non-Linear Analysis (Geometric and Material Non-Linearity)

    I'm trying to setup a simple static non-linear analysis of a polycarbonate (PC) lamp housing, which has a tab that's inserted into a slot, and the tab undergoes a deformation of about 6mm to snap into the slot. I want to investigate the non-linear behavior of the tab "hinge" area as it undergoes...
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