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  • Users: dmacx
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  1. dmacx

    Designe optimization software advise

    I recommend Hypersizer as well. Also, HEEDS is another product to check out.
  2. dmacx

    real eigenvalue analysis of gearbox

    Possibly using an RBE3 element and a CONM2 for the mass of the fluid.
  3. dmacx

    Future of MSC ?

    We used to use MSC.Nastran in my group for many years with Patran. I remember a different MSC 15 years back than what it has become now. It is a shame, but the good news is that other companies are listening. MSC thinks they can solve their problems by just raising their prices justified by...
  4. dmacx

    FEA Program to Learn

    NEiFusion would still be a great program to learn since you will also learn Solidworks and Nastran. If you have the 300 node demo version of NEiNastran you can learn a lot with that as well and not have to spend $2000. FEMAP is a very capable modeler and used widely and Nastran is also well...
  5. dmacx

    FEA Program to Learn

    I use NEiNastran with FEMAP currently and I have played with NEiFusion, which is essentially NEiWorks with SolidWorks included. SolidWorks is a great CAD product and if you are familiar with it or any other feature based CAD package you will not have a problem with. I saw Noran was promoting...
  6. dmacx

    MD NASTRAN

    Hyperelastic materials are in the version 9.1 release. I know because I have the beta. Ask noran support for V9.1. I think the demo CD is not the most recent version. Not sure.
  7. dmacx

    MD NASTRAN

    I have done some amazing things with NE Nastran non-linear. You can also check out their site for some very interesting animations that are on par with dyna and marc. I do agree with the LS-dyna comment. The NE Nastran non-linear capabilities are still very good especially surface contact and...
  8. dmacx

    Definition for a Nastran ROD element

    The rod is a simple truss type element that has axial and torsional stiffness. If you think of a truss where each member is pinned at its end, the rod element would be ideal. Do you need the stiffness matrix formulation?
  9. dmacx

    Sheet Metal Analysis Using FEMAP For Metal Stamping Tools

    You can learn FEMAP in 2 days to the point where building a sheet medal model will not be a problem.
  10. dmacx

    contact simulation

    Gap elements only work when the nodes are perfectly aligned. That is why surface contact is so nice. It does not have this requirement. What solver are you using?
  11. dmacx

    Composite Delamination in Nastran

    What I was referring to was using a single hex element through the thickness and a laminate definition (PCOMP) to define the layer properties. This capability is possible in NEiNastran. I was not sure if you thought I was referring to using a single hex layer for each ply.
  12. dmacx

    Composite Delamination in Nastran

    I am using Nastran now with 3d layered solid elements which give interlaminar tensile and shear stress. I use these stresses and compare them to the bond material allowable.
  13. dmacx

    Nastran composites FEA

    Excellent idea Garland. Sorting would also work. Once you have the ids you can see what areas are missing orientation. The only problem is that a blank could be a zero that was specified so it does not necessarily mean a problem. It would be nice if FEMAP listed the ids from the start since...
  14. dmacx

    Nastran composites FEA

    Sccorpioh1, What did the Nastran support people tell you to try? Did my suggestion help?
  15. dmacx

    Nastran composites FEA

    The 18 elements FEMAP is complaining about have no material orientation defined. I assume you have defined the orientation for the other elements in your model and that you know how to do this. When you export the model all you need to do is look at the Bulk Data file and look for CQUAD4 or...
  16. dmacx

    The results v9 vs. v8

    Have you tried comparing runs with HEXINODE and QUADINODE set to ON for both V8.4 and V9? It would be interesting to see if that makes any difference. It is strange that the error increases with a finer mesh density. In your test models, is there a large variation in stress over a few elements?
  17. dmacx

    The results v9 vs. v8

    Do you have any other element types in the model?
  18. dmacx

    The results v9 vs. v8

    It is HEXINODE not HEXENODE. Turn ON HEXINODE in both cases. I would not use HEXENODE.
  19. dmacx

    The results v9 vs. v8

    What did Noran say? They may want your model or at least the details of it. We have not observed any significant differences in the V8.4 verses V9 results. If you are comparing V8.0 to V9.0 then you are comparing a version that is over 6 years old and I would expect to see of differences in...
  20. dmacx

    NeiNastran ease of use

    As I understand it is the complete merging of 2 surfaces but it uses the surrounding stiffness to create a connection that is similar to if the nodes were coincident and merged. The advantage is that the nodes do not need to be coincident which makes for a much nicer looking mesh. You can...

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