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  1. ShadowWarrior

    Downgrade .odb version from 6.14 to 6.10/6.12?

    I am using an in-house code to visualize results from .odb file but it only supports version 6.10 to 6.14 odb file. Is there an utility or tool to downgrade the version of .odb file?
  2. ShadowWarrior

    ABAQUS/Explicit: maximum initial strain-rate where Smooth step (Amplitude) is applicable?

    Smooth step (Amplitude) is helpful in avoiding excessive distortion at the beginning of the analysis, but I was wondering what is the maximum initial strain-rate we can use it? Say for example, in quasi-static the strain rate is 10-4 s-1 and Smooth step gives a better result than Ramp loading...
  3. ShadowWarrior

    [Urgent] Selecting elements in Mesh Part (Orphan Mesh)

    I have created a mesh part and trying to make an element set from a specific region of the part, I have used the select "by Angle" but it only selects the outer elements. Is there any way I can select the inner elements as well? Please note that Selecting Individually is not an option as the...
  4. ShadowWarrior

    Partitioning problem: Cubic box

    Hi, I am trying to partition a simple cubic box, but the partition has to be internal, basically another cubic box inside the original box. Below is what I have achieved by using Partition Face: Sketch and Partition Cell: Extrude Edges. The box is made transparent to show the internal...
  5. ShadowWarrior

    Periodic Meshing?

    I have a Cubic geometry (with random empty spaces inside) and need to do periodic meshing (same mesh on the opposite face pairs). How do I do that in ABAQUS? Thank you.
  6. ShadowWarrior

    Mesh generation failed

    When I mesh a small portion of the original structure, there is no problem (all hexahedral elements with no warning). Then I mirror the part to reach original structure size and the following message pops up while trying to mesh - "Mesh generation failed due to a problem in the propagation of...
  7. ShadowWarrior

    ABAQUS/Standard with UMAT: How to calculate HOURGLASS STIFFNESS for C3D8R?

    The analysis involves UMAT so HOURGLASS STIFFNESS parameter has to be specified in the input file - http://50.16.225.63/v6.14/books/usb/default.htm?startat=pt06ch27s01aus113.html#d0e296981 Now, How do I calculate the HOURGLASS STIFFNESS parameter for C3D8R element? All I have is the value of E...
  8. ShadowWarrior

    ABAQUS/Standard: Element Deletion?

    I see that ABAQUS/Standard 6.14-1 has Element Deletion option available in Element Type dialog box, shown in the screenshot below. Does the Element Deletion work the same way as in ABAQUS/Explicit? Do I have to define element set for interior elements? What contact method should I use, General...
  9. ShadowWarrior

    [Urgent] How to make the top of the structure uneven?

    I have tried using the Buckle analysis, and then *Imperfection command but it produced negligible amount of unevenness. The expected result is having the top nodes at different Y-coordinates. I would really appreciate any help in this regard.
  10. ShadowWarrior

    Symmetry principle for mass in impact problems?

    I'm simulating a drop impact test (flat impactor) on a cubic block, so modelling only 1/4th of the said block according to principle of symmetry. But what about the mass of the drop impactor? Should that remain as original mass or quarter mass be taken?? If quarter mass is taken, then the...
  11. ShadowWarrior

    [Urgent] ABAQUS/Explicit: OVERCONSTRAINT CHECKS

    I am getting this warning and analysis is not seem to initiate - "OVERCONSTRAINT CHECKS: THERE ARE 12918 BOUNDARY CONDITIONS SPECIFIED IN THIS MODEL. OVERCONSTRAINT CHECKS FOR BOUNDARY CONDITIONS SPECIFIED ON SLAVE NODES OF RIGID BODIES, OF *TIE OPTIONS, OR OF *COUPLING OPTIONS REQUIRE 5 Mb OF...
  12. ShadowWarrior

    Help meshing a complex part: Part 2

    In continuation of thread799-390004, I have the same geometry but with a vertical extension this time. I would appreciate community's help in achieving all Hexa mesh of this new part. The problem I'm facing is to partition it in appropriate regions to get all Hexa mesh. This is the new part -...
  13. ShadowWarrior

    [Urgent] Renaming output variables of the .odb file?

    I have applied filtering of field output, so the variables have a suffix at the end, e.g. LE_Filter-1, RF1_Filter-1. Is there any way I can rename these variables to their normal form after analysis run, e.g. LE, RF1? Maybe a script can do it?
  14. ShadowWarrior

    ABAQUS/Explicit: Obtaining strain rate of individual element

    I am trying to find out the total strain rate of an individual element. From ABAQUS documentation - http://50.16.225.63/v6.14/books/usb/default.htm?startat=pt02ch04s02xbv01.html These are the output options - Which one of these options should I use? Is there any formula to combine the ERij...
  15. ShadowWarrior

    Why do we need to introduce geometric imperfection in ABAQUS?

    So this is a bit of theoretical question, kindly bear with me. When doing column loading analysis, which tend to be dominated by buckling, why do we introduce geometric imperfection? Please list all possible scenarios.
  16. ShadowWarrior

    Creating rough surfaces in ABAQUS

    Hi, I need to create rough surfaces in ABAQUS. The existing model is circular beams having perfect geometry, how can I incorporate disturbance/roughness to the existing surface? I have already tried *Imperfection approach but that's not giving me enough roughness.
  17. ShadowWarrior

    How to determine RVE size for multiscale analysis of composites??

    Is there a standard or method to determine RVE size for multiscale analysis of composites? Suppose the macroscale FE model has minimum and maximum size elements, does the RVE have to be of a size within this limit, or something else? Help appreciated.
  18. ShadowWarrior

    Comparison between DIGIMAT and MultiMech?

    I was looking multiscale modeling software for composites and these two caught my eye, DIGIMAT and MultiMech. Anybody have any experience using them? What is the difference between these two?
  19. ShadowWarrior

    Composite failure criteria usage in metal?

    Hi all, I would like to use Tsai-Hill 3D transversely isotropic failure criterion in modeling metal. The failure model requires 3 parameters -The axial (X) and in-plane (Y) tensile strengths and the transverse shear strength (S). To be valid, the parameters X and Y must satisfy the relation: Y...
  20. ShadowWarrior

    ABAQUS/Explicit: Introducing imperfection in truss like structure

    How do I introduce geometric imperfections in the form of slight deflections in the transverse direction to the truss axis? - http://i.imgur.com/LxUsMgF.jpg I tried the conventional method of doing Buckling analysis and extract first 10 Eigen-modes. Later, using *IMPERFECTION keyword in the...

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