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  1. rickfischer51

    Design Modeler: How to reset worspace/window layout

    View, Windows, Reset Layout Rick Fischer Retired Principal Engineer Argonne National Laboratory
  2. rickfischer51

    Thermoforming

    You. may be able to demold the part with compressed air Rick Fischer Retired Principal Engineer Argonne National Laboratory
  3. rickfischer51

    Best Free CAD software

    btrueblood: I'm looking at Alibre. Have you done anything with it yet? All the rest: Thanks for the input. Interesting to see the range of programs used, didn't seem to be a clear consensus, same as the other threads I read. Merry Christmas! Rick Fischer Retired Principal Engineer...
  4. rickfischer51

    Best Free CAD software

    I searched free CAD here and saw several mentions for FreeCAD. Lots of how-to stuff on U2B. Rick Fischer Retired Principal Engineer Argonne National Laboratory
  5. rickfischer51

    Best Free CAD software

    Im a recently retired engineer with an occasional need to draw stuff. Im on a fixed income (actually not fixed, it's broken, as in no income, just out go) so I need to control my costs. Im looking for a free cad package. Any recommendations? Rick Fischer Retired Principal Engineer Argonne...
  6. rickfischer51

    When we do fatigue life analysis we

    The use of principle stresses allows you to differentiate between tensile and compressive stress fields, while von Mises stress does not. Note that the modified Goodman diagram includes behavior for σm<0. This would suggest that the principal stress is a better choice. However fatigue damage...
  7. rickfischer51

    Epoxy behaviour

    I'm not all that familiar with epoxy. However: 1. Creep is not basically a reduction in elastic modulus. That is a crude idealization so that creep effects can be included in simple hand calculation. Creep is time dependent plastic flow. 2. Epoxy is crosslinked, so its thermoplastic. Creep...
  8. rickfischer51

    stress analysis of welded and un welded joints

    See if you can find "Determination of Weld Loads and Throat Requirements Using Finite Element Analysis with Shell Element Models - A Comparison with Classical Analysis" by M. A. Weaver. Rick Fischer Principal Engineer Argonne National Laboratory
  9. rickfischer51

    accelerated creep testing in Ultem

    I assume you are talking about a test on a finished part with typical service loads. The rate of thermally activated processes in polymers (and a lot of other stuff) typically follows an Arrhenius distribution for temperatures below the glass transition temperature, so in theory this could be...
  10. rickfischer51

    Yield Strength for Plastic

    First, don't even try to understand polymers by comparing them to metals. These are two entirely different material families with entirely different atomic structure, different bonding, different everything. You will only confuse yourself and suffer irreparable brain damage. Second, a tensile...
  11. rickfischer51

    Is it reasonable to average von Mises stress plots at discontinuities?

    "The washer is bonded to the plate with compatible meshes." Actually, it is no longer a washer on a plate, its functionally a plate with a boss. But analytically its two pieces stuck together with an idealization, and you are looking at stress at the idealization and trying to hand wave goofy...
  12. rickfischer51

    NODAL FORCES - ENFO

    You can have shared topology, but you have to select the elements on the edge of one of the parts to be joined by the weld, and then select the nodes on that edge. Put a local CSYS at the origin of the weld group, and set the SPOINT as the global coordinates of the local CSYS. Set the RSYS to...
  13. rickfischer51

    NODAL FORCES - ENFO

    Try selecting only the elements on the part with the hole with the forces. If all the elements are selected, the reactions sum to zero, as your plot shows. Thats why it works for bonded contact and not shared topography. And dont forget SPOINT at the centroid of the weld group so your moments...
  14. rickfischer51

    APDL Scripting in Workbench - Problem 1

    Workbench does not include any geometry (keypoints, lines, areas, etc) in the .db file, so APDL will have nothing to find. The best you can do is get the node at the kp locations. See the attached Rick Fischer Principal Engineer Argonne National...
  15. rickfischer51

    Performing nonlinear analysis by Ansys APDL with the application of two loads simultaneously

    Your script does not display for me. Is this a static analysis? What are your material models? Anything that is time or rate dependent? Creep, visco, etc? /prep7 block,0,12,0,1,0,.25 et,1,186 esize,.125 vmesh,all ex,1,29e6 nuxy,1,.3 nsel,s,loc,x,0 d,all,all,0 nsel,s,loc,x,12 f,all,fy,-5...
  16. rickfischer51

    Performing nonlinear analysis by Ansys APDL with the application of two loads simultaneously

    First, if this is a simple static analysis without time dependent material properties (creep, for instance), TIME,150 means nothing. For a static analysis TIME is just an integer identifying a load step. Second, if you issue a AUTOTS,OFF command after NSUBST,50,1000,10, you will get 50 evenly...
  17. rickfischer51

    Ansys Beginner - Not FEA Beginner

    If you are so convinced that it CANNOT be learned on your own, why are you bothering us? Yes, you can learn it yourself, if you really want to. I just taught myself how to analyze an electromagnet to determine flux density and Maxwell forces with the old unmaintained and unsupported low...
  18. rickfischer51

    ANSYS Workbench defining temperature dependent yield strength?

    See attached. Just click on the box to the right of the * and type a temperature. That creates the next line to fill in yield and tangent modulus. Rick Fischer Principal Engineer Argonne National...
  19. rickfischer51

    Learn the Surprising Truth about Plastics & The Environment

    I heard someplace that the only issue with burning bags is the ink used to print store names an logos on the bags. I think it contained stuff like lead and arsenic. If true, stop printing on the bags and its pretty safe to burn, right? Rick Fischer Principal Engineer Argonne National Laboratory
  20. rickfischer51

    HSFLD242 Elements

    I don't get it. Get in help and search on HSFLD242 and the inflating and rolling tire problem is right there. Google HSFLD242 and the PADT hit is like #5, after a good one from Simutech. This is easy. Why cant Iakasa do it for himself? He won last long in the profession if he pulls this on...

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