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  1. namklof

    Eigen values- insight required

    A "normal modes" analysis neglects damping and produces real eigenvalues and vectors. If damping is included (assuming the damping is less than critical) the eigenvalues and vectors come in complex conjugate pairs. If you look at the last part of chapter 10 in "Funamentals of Structural...
  2. namklof

    Large Global Fea model buckling analysis

    You might also try a difference Eigensolver. Inverse Power Method (SINV) is supposed to be for efficient for large models than Lanczos.
  3. namklof

    Problem in Femap 11.2 reading older version files

    I got word from the Femap folks that this is a bug in 11.2 when a academic license is used and will be fixed in the next update in about a month. Yes, compositesecurves, the neutral file is a work around for now. Thanks for your input.
  4. namklof

    Problem in Femap 11.2 reading older version files

    I am using an academic license and this problem may be related to that. Just installed Femap 11.2 and tried to open files from the previous version (11.1.2). I get the message "Unable to open Student Version Model in this version" and then on the next window I get "Unable to start Database...
  5. namklof

    Difference & application of constrain modes , attachment modes, normal/real modes

    Fixed interface modes and constraint modes are used in component mode synthesis (Super elements in Nastran). These two types of modes are the Ritz vectors for the Craig Bampton method. Other types of modes can also be used. Guyan reduction is based on constraint modes.
  6. namklof

    Transient Heat Transfer Example in Femap

    Has someone have an example of how use solution "21 Transient Heat Transfer" in Femap. I have done steady state heat transfer solutions before but I am having trouble getting the transient solution to work. A simple tutorial showing steps would be great.
  7. namklof

    How Femap works with other solvers (Ansys, Abaqus etc)?

    See section 8.3.3 in the help manual.
  8. namklof

    Linear Contact in Normal Modes analysis

    If you did define contact surfaces, the linear static solution requires an iterative solution process (and technically is a nonlinear solution). A normal modes analysis requires a linear model. I believe if contact surfaces are present, the use a default setting which is probably no contact...
  9. namklof

    Shear locking in plate elements

    A colleague regularly attributes differences between measured results and predicted results from plate/shell element models as due to shear locking (either in plane or through the thickness). We are talking about nonlinear models with many possible modeling errors. My experience has been that...
  10. namklof

    CANDE-2007 Culvert Analysis and Design

    Did you check the Output Report (under the view menu) and the CANDE Log File? It appears there is an error in the imput but without some program diagonistics, finding it may be difficult.
  11. namklof

    CANDE-2007 Culvert Analysis and Design

    Paul - from your description of the model, I suspect your model would require a level 3 analysis, were every detail of the model needs to be specified. For a new user, that would take a great deal of effort. Doug - I don't believe the source code for the current version is available for...
  12. namklof

    how to define contact in axisymmetric model

    Did you provide a compression stiffness value in the gap element property table? In Advanced nonlinear, it works as a nonlinear spring and needs the user to provide appropriate tension and compression stiffness values.
  13. namklof

    Install v6.9 on Windows7, 64-bit

    The problem was fixed with the aid of Abaqus support. The fix was to use: D:\setup -nosystemchecks to install the program.
  14. namklof

    Install v6.9 on Windows7, 64-bit

    I am getting an error installing Abaqus 6.9 on my new laptop. It uses Windows 7 Ultimate with 64-bit OS. When I try to install the program (the documentation go on OK) I get: ? WARNING: Unexpected output from Abaqus executable findWinVer.exe. ERROR: This computer's platform is Windows/x86-32...
  15. namklof

    Roark's Flat Plate Equations vs. FEA... what's the deal?

    As I recall, the analytical solution by Roark also neglects transverse shear deformations which are included in the elements discussed. If that is true, one could expect a well refined mesh to give slightly larger displacements, as noted by IDS.
  16. namklof

    Roark's Flat Plate Equations vs. FEA... what's the deal?

    I belive you are looking at von Mises stress. The values from Roark are normal stresses in either the x or y directions (in the shorter direction of the rectangle).
  17. namklof

    backup/synchronization software

    I use Allway Sync. It is simple and fast.
  18. namklof

    UNDERGROUND PIPE

    There is a FEA program developed for 2-D analysis of buried structures called CANDE-2007. It was recently updated and it is free. It has reasonable material models built in and for a simple trench design, is very simple to run with a canned mesh where you just enter dimensions. See the...
  19. namklof

    FEA analysis on Roto Moulded PE underground Rainwater Tanks

    If the water table is higher than the bottom of your tank, your approach is ok, with the load being only due to the water. The soil load is much more complicated. With a PE material, your tank is flexible. If installed in compacted pea gravel or crushed stone, the soil is much stiffner than...
  20. namklof

    3D beam pin-joint source code

    To create a pinned joint, you condense the stiffness matrix terms associated with the appropriate d.o.f on ONE of the beam elements. Condensation algorithims are in many text book (e.g. Cook, et. al, page 222).

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