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  1. marine59

    Spurious oscillation in heat transfer analysis

    Your problem has nothing to do with any particular implementation/FEA/FDM. It is telling you that the time increment cannot be shorter than is dictated by the material properties and the discretization size, or your transient solution will be oscillatory. I am surprised that ABAQUS says it...
  2. marine59

    Defeaturing

    Thanks very much, cowski. ...export...parts...need for analysis to a parasolid file *Been there, done that, didn't work: *access to parasolids locked out for 2 weeks (newbieacct) *parasolids created would not import into ANSYS ???? don't have time this week to work on...
  3. marine59

    Low friction pulley for thrust stand

    You have to determine whether this is a THRUST LOAD application or RADIAL LOAD before you buy any bearings.... You can get low-friction, radial capacity, or thrust capacity. NOT all 3 in same bearing unless load is VERY low compared to the bearing RATED load.
  4. marine59

    Defeaturing

    If your goal were to: modify (defeature, remove blends, convert solid==>sheet bodies, hide unnecessary complexities) an assembly of .prts for ANSYS meshing it is much more convenient to 1) modify each part singly 2) import it FROM ANSYS (on top of previous parts) 3) create a component with a...
  5. marine59

    Creating NACA airfoil model

    Good ideas all. I have done 3D turbine blades with twist, using Excel to create the data files for the section planes. If you plan to use equations, definitely process them in Excel. Especially if you have to derive the cambered shape from the basic NACA curve. The UG splines work well as...
  6. marine59

    Defeaturing

    In a 3D solid model assembled of 3D parts mated with random locations of Global and Work coordinate systems: is there a 1) straight-forward OR 2) POSSIBLE method to get rid of "blends" "fillets" "chamfers"...
  7. marine59

    Hard Anodising

    You might assume the existence of the minimum depth crack you can't find under dye-penetrant inspection. Then calculate crack propagation using NASA FLAGRO or the current equivalent. With hard-anodizing and the stress-concentration of a thread form (see Peterson), I would expect cracking...
  8. marine59

    Stress at fixed boundary condition

    Fixed boundary conditions aren't real, but an approximation to a real-world condition. As you mesh finer, the calculated stresses converge on the theoretical values you are calculating by hand, which are also not real. All boundary conditions are an approximation. I use ANSYS. I always use...
  9. marine59

    Fatigue assessment without the fudge

    The submodel approach is a good one, and solves the problem of meshing a large frame with grain-of-sand elements. HOWEVER: if you build a singularity, infinity will come, followed immediately by crack initiation. As pointed out above, this is not a mesh size problem. In the 60's it was...

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