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  1. DickButkus

    Need advice on choosing FEA software

    Of all the solvers, (and someone can correct me if I am wrong), I believe that only ABAQUS provides an explicit and an implicit solver. The explicit solver excels at shock and impact, while the implicit solver does the traditional non-linear (and linear) analysis including heat transfer. Both...
  2. DickButkus

    impact analysis

    Is it a cylinder block or actually a cinder block? If you are dropping a cinder block onto a sheet of plastic from a significant height then good luck - you'll need it! You may as well be using MS Paint for your FEA results. All teasing aside - if the impact speed is significant, then you...
  3. DickButkus

    ABAQUS and OpenPBS

    Has anyone used queuing software with ABAQUS? I believe ABAQUS works with LSF, but I was wondering if anyone has tried the free OpenPBS or PBSPro (from Altair)? With Version 6.4 ABAQUS came out with a distributed memory version of ABAQUS/Explicit which begs to be used on a cluster, but then...
  4. DickButkus

    Electronics Package FEA - software opinions

    Don't forget ABAQUS, it's solver is also very effective at linear problems and will allow you to do the fully coupled thermal stress problem. Also, many packages do not allow you to pre-load a structure prior to extracting vibrations. This pre-load may be in the form of thermal stress due to...
  5. DickButkus

    C3D10 vs C3D10M ?

    1. Without contact I would expect you to get identical results with both elements. The "M" is more expensive, that is, requires more memory to run. 2. Never ever use C3D10 in contact. Always use C3D10M in contact. You can mix C3D10M and C3D10 elements - but I would not trust the...
  6. DickButkus

    Compression of Hollow Rubber Seal

    D is the compressibility. Although some books refer to rubber as incompressible, it is about as compressible as water. In reality, rubber is far more compressible than something like steel, but it's shear modulus is so low that the incompressibility is relative. The bulk modulus for rubber is...
  7. DickButkus

    Rubber Compression -Load Deflection Curve

    1. This test is extremely difficult to do accurately. The friction effects can have a large influence on your test data. In order to properly run this test you need frictionless platens. You can try and lube them, but you have to observe your puck accurately when running the test - if there...
  8. DickButkus

    Output in external text file

    If you are applying displacements you will want the output variable identifiers: RF1, RF2, and RF3. These are your reaction forces in the 1,2, and 3 directions.
  9. DickButkus

    Beam Contact Simulation

    The best way to do beam to beam contact is to take the problem into 3D, run in /Explicit, and use general contact. You have to use /Explicit and 3D, general contact is not available in 2D or in /Standard. General contact will create an influence radius around the beam elements based upon the...
  10. DickButkus

    wave speed and deformation speed

    This means that you are deforming the element faster than a stress wave can propogate across it. In effect - you are breaking the sound barrier. Most often the cause for this is inconsistant units. Be sure that your material density is correct. Remember that the density of steel is NOT...
  11. DickButkus

    problem *INITIAL CONDITIONS, TYPE=STRESS

    Check the example problem on fluid sloshing. I believe you want to specify the direction in which the gravity is acting - so you may want to specify 0,-1,0 instead of -1,-1,-1. Like I said though, look into the documentation for the fluid sloshing example. They used /Explicit and adaptive...
  12. DickButkus

    CAE-Using nodes/points on surface for features

    First, use coupling rather than beams. You could easily overconstrain the model with beams. If the beams are rigid, or nearly so, then everything that is touched by a beam will be stiffened by it. With distributed coupling you can transmit a load into a structure without overconstraining it...
  13. DickButkus

    Bearing Support/Restraint

    Distributed coupling is new in 6.4. You have the option of how you want the distribution to occur, linear, quadratic, or cubic. This looks like it allows for a load transfer into a surface. The points all move together in an average sense, but are allowed to move. Look in the interaction...
  14. DickButkus

    Bearing Support/Restraint

    Have you looked at distributed coupling?
  15. DickButkus

    Has automatic hexahedral meshing a future?

    Brad, I don't know why this one irks me so, but I can't seem to just let it go. Sure you can collapse elements into pyramids, but if you're going to do this don't call it a hex mesher, call it a pent mesher instead, or a penthex mesher. 69thbugler, I wish you luck and I truly hope you have...
  16. DickButkus

    Create complex object with shell in CAE

    Go to the property module. Across the main menu (on top) you'll see "Skin". When you hit this you'll have the option to open a skin manager or to just create the skin. Hit create, give it a name, and start selecting faces that you want to create the skin on. Good Luck!
  17. DickButkus

    Has automatic hexahedral meshing a future?

    Algor has automatic hex meshing -- good one. Now if only they could remember how many sides on a hex element... Maybe they have fixed this, but last time they tried this for me some of their "hex" elements onlt had five sides. ABAQUS has put a lot of effort into developing a...
  18. DickButkus

    to avoid singularity in shell to solid

    In ABAQUS you simply click on the edge of the shell part, then the face of the solid part, and use shell to solid coupling. ABAQUS automatically generates a distributed coupling based on the thickness specified in your shell section in order to properly distribute the moments. You don't want...
  19. DickButkus

    FEA Software for airspring

    Hi, I saw your post in the ABAQUS forum. I saw Firestone do a paper on ABAQUS and airsprings in the users' conference. I believe the trick is to use a nice stable rubber model and hydrostatic fluid elements on the inside. You can allow air to escape the cavity depending on pressure using...
  20. DickButkus

    Is there a stable version of Windows?

    ABAQUS runs very well on Linux. It's one of my favorites because it never seems to crash. Linux is also nice because of the clustering.

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