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  1. Replies
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    Hi Oliver, My email is ateshian at...

    Hi Oliver,

    My email is ateshian at columbia.edu

    Best,

    Gerard
  2. Hi Jerry, I am glad it worked out. I have...

    Hi Jerry,

    I am glad it worked out. I have updated the User's Manual to revise the large penalty parameters suggested in the examples and to provide more guidelines on how to select those...
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    Hi Oliver, Would you mind attaching a small...

    Hi Oliver,

    Would you mind attaching a small example file that illustrates this issue? It would be easier for us to debug it with an example.

    Thanks,

    Gerard
  4. Replies
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    Hi Scott, Yes, currently the...

    Hi Scott,

    Yes, currently the tension-compression contact only models frictionless contact (whether deformable-on-deformable or deformable-on-rigid). We have recently implemented a robust...
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    Hi Oliver, In my experience, using...

    Hi Oliver,

    In my experience, using tension-only springs (or tension-only fiber models) can cause instabilities in a model, so I would suspect that this is the issue with your model.

    Best,
    ...
  6. Hi Jerry, Here are the changes I made to get...

    Hi Jerry,

    Here are the changes I made to get your model (trr3.feb) to run:

    1) Since the two bodies are connected by a revolute joint, I deleted the rigid body constraints you placed on body 2. ...
  7. Hi Alessandro, As per my email message to you,...

    Hi Alessandro,

    As per my email message to you, I was able to resolve this issue by setting the stiffness matrix to non-symmetric (<symmetric_stiffness>0</symmetric_stiffness> in the Control...
  8. Hi Sanaz, Are you using the 2.0 format or 2.5?...

    Hi Sanaz,

    Are you using the 2.0 format or 2.5? The element data specification is different for these two formats.

    Best,

    Gerard
  9. Replies
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    Hi Oliver, Tied contact interfaces should work...

    Hi Oliver,

    Tied contact interfaces should work equally well with curved or planar surfaces. Have you turned the auto-penalty on? This will make it easier to calculate a valid penalty parameter. ...
  10. Hi Alessandro, Yes, I'll take a look and see...

    Hi Alessandro,

    Yes, I'll take a look and see if I can resolve the issue.

    Best,

    Gerard
  11. Hi Alessandro, Yes. You don't need to define...

    Hi Alessandro,

    Yes. You don't need to define any finite element domain for the dummy RB. You just need to create a rigid body material and place its center of mass at the appropriate location (at...
  12. Hi Alessandro, FEBio uses quaternions to...

    Hi Alessandro,

    FEBio uses quaternions to describe rigid body rotations. Effectively, this is equivalent to specifying a rotation axis (using a unit vector) and a rotation angle about that axis. ...
  13. Replies
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    Hi abhi1947, The fiber should work with the...

    Hi abhi1947,

    The fiber should work with the biphasic material. Can you post a (small) file that illustrates the problem you are having?

    Best,

    Gerard
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    Hi Andrew, I am not sure that I understand...

    Hi Andrew,

    I am not sure that I understand what you want to do exactly. The tubes are not touching but you want them to move together: Do you mean that only the inner surface of the outer tube...
  15. Hi Bo, When using solid mixtures, you need to...

    Hi Bo,

    When using solid mixtures, you need to assign a name to each mixture component, then use that name in the optimization file. For example, in the model file,

    <material id="1"...
  16. Replies
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    Hi Shady, Yes, as you surmised, negative fluid...

    Hi Shady,

    Yes, as you surmised, negative fluid pressure values represent sub-ambient pressures. In continuum mechanics, stresses and pressures are evaluated relative to a reference state. For...
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    Hi Sahar, I tried this out myself and I got it...

    Hi Sahar,

    I tried this out myself and I got it to work. I have attached the sample file I created (1505). It consists of a cube with 5x5x5 elements. There are springs and dampers connected to...
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    Hi Fahd, For the given material properties and...

    Hi Fahd,

    For the given material properties and ramp speed you have chosen, the elements facing the rigid porous interfaces are being compacted such that the triphasic material is losing all of the...
  19. Hi Antoine, The values appear reasonable to...

    Hi Antoine,

    The values appear reasonable to me. Please keep in mind that the best way to obtain these values is to fit the model to experimental data. The studies from my lab where we measured...
  20. Replies
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    Hi Sahar, nullptr was introduced in C++11. ...

    Hi Sahar,

    nullptr was introduced in C++11. Check your compiler settings to use that version. If you can't find it, substitute 0 (zero) for nullptr.

    Best,

    Gerard
  21. Replies
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    Hi Sahar, febiosource_linux.run is a program...

    Hi Sahar,

    febiosource_linux.run is a program that installs the source code on your machine. I don't use Linux, so I don't have firsthand experience on running this installation package. On the...
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    Hi Jonas, That's correct. The latest version...

    Hi Jonas,

    That's correct. The latest version of PreView will automatically save named selections and provide the option to plot "enclosed volume" for each named surface in the model.

    Best,
    ...
  23. Replies
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    Hi Sahar, Yes, I suggest that you create two...

    Hi Sahar,

    Yes, I suggest that you create two rigid bodies with zero mass, interface them with one node each, and use them to create a damper.

    Again, I haven't tried this myself, but I believe...
  24. Replies
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    Hi Jonas, I implemented a plot variable in...

    Hi Jonas,

    I implemented a plot variable in FEBio called "enclosed volume", which can be used with a named surface. It evaluates the volume enclosed by a surface at each time point and associates...
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    Hi Sahar, If you want to change the number of...

    Hi Sahar,

    If you want to change the number of Prony series coefficients and time constants you need to download the source code and edit the parameter MAX_TERMS (currently set to six) in the class...
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