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  1. cloche

    Importing CAD files into Ansys

    I suppose IDEAS has a similar kernel with UG (though born very differently, they converged to be NX recently), so Drej's advice to use Parasolid format is very valuable: we use UG NX2 and the import of Parasolid files is generally very good (it fails only in some very particular situations, for...
  2. cloche

    Timoshrnko beam mass and stiffness matrices?

    Sure, GBor. I figure out that one must also look at a theoretic FEM book, where the process of building the element matrices is described. Then, it's just a "mixing" matter btw elasticity theory and FE theory... Not so easy, I fear... As regards FE theory, I've got a very good book from Prof...
  3. cloche

    modeling of rubber hyperelasticity

    Hi elogesh, I performed a first run of analyses with a model of a seal for butterfly valve. I used the M-R constants I wrote in my first post: Ansys seems to be clever enough to "sort" the 2 M-R constants so that C1 is always bigger than C2. Accordance with experimental tests is acceptable but...
  4. cloche

    Non lineal and aerodynamics software

    ANSYS LS_DYNA is a reference for explicit dynamics. I personally tested ALGOR Multiphysics with MES, and I found it a really good solution. Not as controllable as ANSYS, but the price is not the same also... ANSYS' CFD is now CFX, no more Flotran, so you need a license - and the additional...
  5. cloche

    Timoshrnko beam mass and stiffness matrices?

    ANSYS element type BEAM186 is a timoshenko beam. I looked in the help but I didn't find out the matrix of this beam. Anyway, here are some references: S. Timoshenko. Strength of Material, Part I, Elementary Theory and Problems. 3rd Edition. D. Van Nostrand Co., Inc.. New York, NY. 1955. S...
  6. cloche

    What are yout Layer Set-ups?

    cfr thread561-125500 "Layer Standards"
  7. cloche

    Piezoelectric harmonic analysis

    The only possibility I see at the moment, due to the fact that you find the results you expect in the /POST1, is that you didn't ask the program to save the results at every timestep of your analysis: with the default setting, it saves only the last substep, so the /POST26 have only one point to...
  8. cloche

    rotating frame check box

    This feature is only available with Floworks Professional license, not with Standard. If you bought FW with a Standard lic and you didn't know that, probably your reseller can help you shift the license. If you use at home a cracked version of FW, ensure that the lic file doesn't contain both...
  9. cloche

    Piezoelectric harmonic analysis

    Piezoelectric materials have the property that they "shrink" when they are subjected to a potential difference, so it makes sense that a displacement response may be expected from a sine voltage. BUT, as Drej says, you must ensure that: 1) the elements you use have the correct DOFs (not "pure...
  10. cloche

    PTC (Pro-E) article truths.....10 ways Solidworks slows you down

    Do you want to know a funny thing? In the italian PTC site, this comparison looses any apparent reference to SolidWorks (SW becomes "traditional CAD package"), because in Italy comparative advertising is admitted by law only under very strict conditions, one of which is the complete description...
  11. cloche

    Friction factor

    You can use powders like "Carborundum" on the steel-base contacting surfaces. Dry steel-steel + carborundum raises up the friction factor to 0.5. Roughening the contacting surfaces can raise it up to 0.25 / 0.3 (but you have to check if there aren't any drawbacks...)
  12. cloche

    does Workbench 9.0 support gradiented B.C.s?

    I'd like to know if Workbench 9.0 supports gradiented Boundary Conditions, or more in general, BC that are coordinate-dependent (for example non-uniform pressure distribution, non-uniform temperature distribution, and so on). Thanks to all!
  13. cloche

    Ansys Workbench 9---Thermal Expansion?

    Ah, OK. This solves the OP question. But, by the way, are gradiented BC possible in WB9, or not? I never used it until now except for some simple tasks, always used Classical, but as my company is pushing on CAD/FEM interoperation, WB would be great in conjunction with our CAD...
  14. cloche

    Ansys Workbench 9---Thermal Expansion?

    Sie auch muessen Seine Antwort zu erklaeren!!! (You too have to make your answer clearer) Refer to what? Must I understand that WB does handle gradiented BC? Or, simply, did I get confused by reading "...for a thermal analysis, I got..." instead of "...from a thermal analysis, I got..."?
  15. cloche

    Ansys Workbench 9---Thermal Expansion?

    ...expansion but not necessarily thermal stress (it depends on the restraints). If the T is a gradient in the x direction, it will be: T=f(x;y)=a*x+b Let's generalize to an arbitrary T distrib (polynomial in this case): T=f(x;y)=a*x^2+b*y^2+c*xy+d*x+e*y+f For these cases, my collegues said that...
  16. cloche

    Stress Concentration in Bolt Holes

    Huiying, 1) as I don't know Nastran, I'm figuring out what your model would be in ANSYS. If I understood well, then the high stresses you are getting on the holes ARE calculation hot-spots. 2) if you want to examine the bolted joint with FE, build a "full-geometry" model where the bolt itself is...
  17. cloche

    Ansys Workbench 9---Thermal Expansion?

    From above post from Drej: <Eth=alpha(T-Tref)> Yes, but my collegues who use Workbench told me that T must be constant over the application target, so if there is a variable T distribution over a surface, for example, either you slice the surface within the CAD and "discretize" the T gradient...
  18. cloche

    Ansys Workbench 9---Thermal Expansion?

    As far as I know, Workbench 9 doesn not allow you to place any "gradiented" or spatially-variable load, so you have no chance to do it within the WB interface. You have to enter the Classical environment after writing the "Ansys Input File" (.imp) and finish your work there.
  19. cloche

    PTC (Pro-E) article truths.....10 ways Solidworks slows you down

    Hi everybody! When I mentioned "Ferrari vs Fiat" I didn't mean to associate SW or PRO/E to any of the two: it was only to point out that EVERY cad system on the market can fit some particular needs of particular companies. You may find some where SW is unbeatable, others where PRO/E is. In my...
  20. cloche

    PTC (Pro-E) article truths.....10 ways Solidworks slows you down

    No, no, no, no, please, not again this matter about comparing one CAD with another. This stuff always come out to flames. Anybody can tell pros and cons of every CAD or whatsoever in the market, and it's not because Ferrari exists that one may not be pleased with a Fiat. By the way: PTC is...

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