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  1. Hi, Yes, all moduli have the same units....

    Hi,

    Yes, all moduli have the same units.
    Using the standard notation found on Wikipedia, the correspondence is C10 = c1, C01 = c2, C11 = 0.

    Best,

    Gerard
  2. Hi, Can you please clarify the question "how...

    Hi,

    Can you please clarify the question "how can I mesh my models in 3D, through the full depth?"

    Best,

    Gerard
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    Hi Peter, If you are running a diffusion...

    Hi Peter,

    If you are running a diffusion analysis with very little convection, changes to the permeability will have virtually no effect on the solute concentration profile, so I am not surprised...
  4. Hi, I think the main issue with your model is...

    Hi,

    I think the main issue with your model is that the force on the indenter is going upward (positive) when it should be pointing downward. So you need to negate the load you are applying, to...
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    Hi Harley, You can control the mesh size in...

    Hi Harley,

    You can control the mesh size in Tetgen by specifying the Element size. For your model I suggest trying 0.14.
    The easiest way is to select elements and hide them to see elements inside...
  6. Hi Albert, It is not easy to diagnose your...

    Hi Albert,

    It is not easy to diagnose your problem with the information provided. Have you tried varying the spring stiffness by an order of magnitude up or down to see if that improves/worsens...
  7. Hi Armand, I am not sure I understand what you...

    Hi Armand,

    I am not sure I understand what you are trying to do. The model you attached is an incompressible solid (not a fluid) which is constrained from deforming in all directions except the...
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    Hi Haaris, Currently the biphasic and...

    Hi Haaris,

    Currently the biphasic and multiphasic modules cannot perform dynamic analyses. We plan to introduce this feature in the future, but this won't happen for a while. (Adding dynamic...
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    Hi Peter, The multiphasic material domain...

    Hi Peter,

    The multiphasic material domain allows you to specify solid-bound molecules whose referential mass density (mass-based concentration, per volume in the reference configuration) may...
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    Hi, The file you have attached does not have...

    Hi,

    The file you have attached does not have any boundary conditions, so the analysis will fail since there is nothing to constrain the geometry.

    Please keep in mind that the application of...
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    Hi Kinga, In a biphasic-solute analysis the...

    Hi Kinga,

    In a biphasic-solute analysis the porous material may include one neutral solute, let's call it A. In any analysis you can choose to prescribe the initial concentration cA0 of that...
  12. Hi, The only non-zero internal forces you can...

    Hi,

    The only non-zero internal forces you can retrieve are the reaction forces at nodes where displacements have been prescribed. At all other nodes the output will be zero.
    No, the internal...
  13. Hi Lewis, Yes. Yes. Best, Gerard

    Hi Lewis,

    Yes.
    Yes.

    Best,

    Gerard
  14. Replies
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    Hi, In FEBio2 the density is only taken from...

    Hi,

    In FEBio2 the density is only taken from the parent material, that's why you need to move the <density> field to the <viscoelastic> material. In FEBio3 this issue will be fixed.

    Regarding...
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    Hi, In principle what you are doing should...

    Hi,

    In principle what you are doing should work, i.e., setting g1=0 should recover the elastic response. The fact that you get a very different response suggests that the issue is elsewhere. Can...
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    Hi Peter, Since the solid matrix does not...

    Hi Peter,

    Since the solid matrix does not deform in this problem, you should set dtol=0. Currently your model struggles with convergence on the displacement, even though the displacement residual...
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    Hi, Try this problem with "sliding-elastic"...

    Hi,

    Try this problem with "sliding-elastic" instead of "sliding-with-gaps" and see if it works better. "sliding-elastic" is our most recent implementation of frictional contact, it may give you...
  18. Hi Ann, To constrain radial displacements on a...

    Hi Ann,

    To constrain radial displacements on a cylindrical surface you can also use the Symmetry Plane constraint. Despite its name, this constraint is more general as it enforces zero...
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    Hi, The FSI solver is not suitable for porous...

    Hi,

    The FSI solver is not suitable for porous media problems. You need to use the biphasic solver (which is suitable for poroelasticity) to prescribe a fluid pressure across a porous material. A...
  20. Hi Lewis, In principle (i.e., if the penalty...

    Hi Lewis,

    In principle (i.e., if the penalty parameter for the symmetry plane is high enough), the axisymmetric analysis results between a 1/4 (90-degree) model and a narrow wedge (3-degree) model...
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    Hi Doug, Unfortunately I cannot reproduce this...

    Hi Doug,

    Unfortunately I cannot reproduce this problem on my Mac (using PostView 2.4.0 and PostView 2.4.4, but on MacOS 10.14.6).

    In the meantime I recommend that you use QuickTime Player to...
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    Hi Ishan, FEBio's code is structured such that...

    Hi Ishan,

    FEBio's code is structured such that all the modules can use the Newton solver and its quasi-Newton variants (BFGS and Broyden). The Newton solver is the default (and currently...
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    Hi Harley, When the PostBL tool fails it...

    Hi Harley,

    When the PostBL tool fails it doesn't give any error message. You just don't see any changes to the mesh, which means it didn't work.

    Due to the fact that PreView/FEBioStudio does...
  24. Hi Abby, The disc mesh in your model does not...

    Hi Abby,

    The disc mesh in your model does not share nodes with the meshes for c3 and c4, so the model doesn't know that these structures need to be connected. You can use a tied interface...
  25. Hi Lewis, The load you applied does not cause...

    Hi Lewis,

    The load you applied does not cause too much deformation. I was able to increase it by a factor of 10 and also by a factor of 100 and in both cases the analyses converged and the...
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