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  • Users: rob768
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  1. rob768

    converting units in Femap

    Hi, i have made a forced frequency calculation over a range of frequencies, resulting in results at each frequency step. My results are vibrations speeds in m/s (model is in SI units). is it possible to convert the results of each step from m/s to mm/s?
  2. rob768

    guyan reduction

    Guys, i want to experiment a little with guyan reduction in a dynamic calculation. So far, I never found the need for it but as models are getting bigger and bigger I want to see if it is advantageous to use without losing accuracy or results. I have a model of a ship, and i want to do both a...
  3. rob768

    Hi guys, I need some help (yet agai

    Hi guys, I need some help (yet again). i have an output set which contains the results of a forced frequency response calculation, spanning from 5 to 60 Hz, in 0,5 Hz steps. The calculation is performed in SI units, which results in vibration velocities in m/s. As the calculated values are low...
  4. rob768

    Hi all, I need some help. I have a

    Hi all, I need some help. I have a ship's model and performed some calculation with known excitation sources. For each source, I used a different load case. the aim is to calculate responses at several locations as velocity. I want to combine all loads to a single output files. Can someone...
  5. rob768

    results coyping

    Hello all, i have question regarding a calculation i performed. I did a calculation on the bolted flange connection, using 1/16th of the complete geometry (the flange has 16 bolt holes). I used symmetry and so far, so good, but i want to present the results for a full flange. I can easily copy...
  6. rob768

    Bolt preload followed by pressure load

    Hi there, I'm stuck in a Femap model. I modelled a section of a connection of two flanges, connected to each other by a pre-loaded bolt. Symmetry is applied to simulate a full model. In the pre-loaded model, i want to apply an internal pressure load. I tried to do this with a restart command...
  7. rob768

    Question on gear failure

    Hello All, i'm examining a failed gear (pinion-wheel, straight teeth) in which the pinion lost a few tooth due to fatigue, starting from one side of the teeth. There is also a pattern screaming misalignment, but this pattern is present on both flanks, and in both cases on the side of the...
  8. rob768

    elasticity of a belt

    Hello, for torsional vibration calculations of installations which use belt drives and pulleys for the distribution of power to different equipment, I sometimes need information on the elasticity of a belt. I realize a belt is not a spring, but I assume it can be represented as such, with an...
  9. rob768

    "rust" of a stainless steel tank

    Hi all, I am faced with a stainless steel (316L) tank having been used in the storage of Choline chloride. This tank shows corrosion, in particular in welds and heat affected zones. Strangely enough, the corrosion products are deep "rust" coloured (reddish-brown), suggesting formation of iron...
  10. rob768

    Question about heat treatment of castings

    I have a casting designated C35CrNiMo6.6. The parts made from these materials (relatively large block of 150x150x700 mm) show extreme poor mechanical properties, with yield and tensile almost equal, elongation <2% and Charpy-V values of average 7-8 J. Can this material be heat treated...
  11. rob768

    Allowable surface stress

    For a problem i am examining in a hydraulic installation, I am looking for an indication of maximum allowable surface stress (in lubricated and in unlubricated conditions) for the contact between hardened steel pin/bushings. The problem is adhesion, but also abrasive wear. I assume they are...
  12. rob768

    allowable pin-lug stress

    Does anyone have information on allowable stress in a steel-steel pin lug combination?
  13. rob768

    drop simulation

    Can anyone point me in the right direction please. I want to model stiff table, on which, through 4 spring elements, a small platform is mounted on whic a mass is fixed. This configuration drops 0.5 meter, after which the table lands (on a corner, but that is of secondary interest). Assuming...
  14. rob768

    need help modelling

    Hello, I want to create a model of a radial bearing-like configuration, in which the balls transfer force from inner to outer part (see attached model). I want to do this using connections, and a pie-shaped segment using symmetrie. I can't get this to work due to "bad pivot ratios". Obviously i...
  15. rob768

    non-linear analysis options

    Does anyone know if it is possible to use both elements in a non-linear plastic analysis? Which solution method should i choose? The analysis runs, but the stress calculation seems to be linear. regards rob
  16. rob768

    thread calculation

    Hi all for a research project, I want to calculate the stress in the root zone of some threaded elements. I am trying to find the best way to do this. I used spring elements between mating thread surfaces (in combination with non-linear material), but i want to try this using slide line...
  17. rob768

    modelling question

    I have a question which is difficult for me to express in English. I have a 3D geometry consisting of several types of beam (a steel frame). I want to model the surfaces of the beams as plate elements, so i need only the central plane of each of the solid sides of the beams. However, as this is...
  18. rob768

    convert workbench file to Femap?

    Hello, is it possible to convert an Ansys Workbench file to a format readable by Femap? We want to evaluate a design as part of a failure analysis. however, the standard output of Workbench is not compatible with the output Femap expects for an Ansys file (*.ans, *. cdb)
  19. rob768

    gear surface damage due to electrical discharge?

    I am looking at a gear with a damage that resembles that of electicral pitting due to arc discharging. Is there anyone who has seen this before? I have seen it, but in bearing. The appearance is very similar, which makes me thinks this is electrical to.
  20. rob768

    Delayed information due to residual stress

    Is there anyone who can shed some light on the subject of residual stress and delayed plastic deformation under static condition? I am of the opinion that the distribution of any residual stress in a cast or welded construction is stable, and that plastic deformation can only occur when stress...

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