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  1. Replies
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    Hi, How did you determine the experimental...

    Hi,

    How did you determine the experimental stress? If you used a force and divided it by an area, you may want to consider doing something similar in the computational model. That will give you...
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    Hi David, If you mean the center of mass for a...

    Hi David,

    If you mean the center of mass for a non-rigid object, you can get an approximation in PostView by looking at the average X, Y, Z position of the model. Have you tried that?

    What...
  3. Hi Adrienne, How are you assigning the...

    Hi Adrienne,

    How are you assigning the material fibers in PreView? In PreView, fibers will only be displayed for transversely isotropic materials. If that is not the material you are using, then...
  4. Hi, I have a few suggestions and comments...

    Hi,

    I have a few suggestions and comments regarding your model. First off, I think you can get rid of the tied interface between the cortical bone and trabecular bone. In your model, they are...
  5. Hi, There is no option to extract traction...

    Hi,

    There is no option to extract traction vectors in FEBio other than for contact surfaces. For surface loads, you essentially prescribe the traction, so you know what it is, and for free...
  6. Thread: FEBio Crashes

    by maas
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    In the model you sent, the FixedDisplacement2...

    In the model you sent, the FixedDisplacement2 boundary condition has no selection assigned. Could that be part of the problem? If you do not need this boundary condition, perhaps delete it, otherwise...
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    Hi Jeremy, I think that should work as long as...

    Hi Jeremy,

    I think that should work as long as the symmetry planes are the coordinate planes that intersect at the origin. I suggest to try it out on a simple model and see if it works. Keep in...
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    Hi, The quaternions exported by FEBio define...

    Hi,

    The quaternions exported by FEBio define the total rotation of the rigid body, from the initial configuration to the current one. So if you just want the transformation of the last step, you...
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    Hi, Unfortunately, FEBio cannot output in the...

    Hi,

    Unfortunately, FEBio cannot output in the PostView format, because PostView expects all the values for all time steps for a node (or element) on the same line. FEBio can only output one time...
  10. Hi, I'm afraid there is no easy way to do...

    Hi,

    I'm afraid there is no easy way to do this. The only way is to write your own contact formulation. You could start by copying one of the contact formulations in FEBio into a plugin, and then...
  11. Hi Muhammed, I'm not sure what the issue could...

    Hi Muhammed,

    I'm not sure what the issue could be. Can you please send me the file? If I can replicate the issue, perhaps I can offer an explanation. If it's too big to upload, feel free to send...
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    Hi, Your model consist of three disconnected...

    Hi,

    Your model consist of three disconnected parts. There is no connection between these parts, and thus their initial temperatures are not affecting each other. You can add a "gap heat flux" to...
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    Hi Kostas, Are you able to share your model?...

    Hi Kostas,

    Are you able to share your model? That would allow us to reproduce the issue on our end and hopefully figure out a solution. If it's too big to upload, feel free to send it to steve dot...
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    Hi David, You can send it to steve dot maas at...

    Hi David,

    You can send it to steve dot maas at Utah dot edu.

    Cheers,

    Steve
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    Hi David, In your file "Prestrain_lig_PS.feb"...

    Hi David,

    In your file "Prestrain_lig_PS.feb" (which Dr. Ateshian forwarded to me), on line 11879 the value for "d" is NAN. This is the mat_axis definition for element 22:



    <element...
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    I suspect the problem is a missing WIN32 macro....

    I suspect the problem is a missing WIN32 macro. This macro used to be defined by default for any Windows projects in VS, but that no longer appears to be the case in VS2015. This macro is used in...
  17. Hi Noor, PostView does not have that...

    Hi Noor,

    PostView does not have that capability, although I'm happy to look into it. Our new FEBioStudio (which combines PreView and PostView) does have that ability, so perhaps give that a try...
  18. Thread: Change Surface?

    by maas
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    Hi, I assume you want to make changes to a...

    Hi,

    I assume you want to make changes to a mesh when re-opening PreView? If the mesh is an editable mesh, then there are a few things you can do, but it depends on what exactly what you want to...
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    Hi, Regarding your plugin questions: - Yes,...

    Hi,

    Regarding your plugin questions:
    - Yes, you can have as many plugin classes bundled in a single plugin dll.
    - You don't need to do anything on the PostView side. You define your new fields...
  20. This is because FEBio uses an augmented Lagragian...

    This is because FEBio uses an augmented Lagragian approach which always needs a little bit of overlap in order to generate the contact forces. You can reduce the penetration by increasing the penalty...
  21. Hi, The problem is that you are trying to keep...

    Hi,

    The problem is that you are trying to keep the block from moving using two opposing contact interfaces. This is inherently an ill-conditioned problem because it requires that the two contact...
  22. Thread: Using a plugin

    by maas
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    Hi Gil, FEBioStudio does not recognize FEBio...

    Hi Gil,

    FEBioStudio does not recognize FEBio plugins. FEBioStudio and FEBio are two separate programs. FEBioStudio only generates the FEBio input files and calls FEBio as an external process when...
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    Hi Nataliya, I recommend using whatever is...

    Hi Nataliya,

    I recommend using whatever is closest to your experimental data, which usually would be load versus displacement.

    Cheers,

    Steve
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    Hi, I took a quick look at your model and it...

    Hi,

    I took a quick look at your model and it seems that the negative jacobian is caused by the sliding contact interfaces. This might be caused by the large difference in material parameters...
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    Hi Doug and Ishan, As far as I can tell, our...

    Hi Doug and Ishan,

    As far as I can tell, our latest 2.5 development version does not have these issues. If you reach out to me via email (steve dot maas at Utah dot edu), I can let you try this...
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