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  1. Replies
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    Hi Shamimur, Could you please clarify which...

    Hi Shamimur,

    Could you please clarify which problem/file?

    Thanks,

    Gerard
  2. Replies
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    154

    Hi Fluvio, Yes, that makes sense. We are...

    Hi Fluvio,

    Yes, that makes sense. We are currently working on this type of contact interface where we also include some form of damage when there is excessive tensile strain. This is work in...
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    154

    Hi Fluvio, The tension option was implemented...

    Hi Fluvio,

    The tension option was implemented to model symmetry planes, for which the friction should be zero. When friction was introduced into the sliding-elastic contact formulation, we...
  4. Hi Yidan, Here is the list of changes I made...

    Hi Yidan,

    Here is the list of changes I made to your file:
    1) Lines 234132-234133: Changed
    <laugon>1</laugon>
    <tolerance>0.01</tolerance> to
    <laugon>0</laugon>
    <tolerance>0</tolerance>
    2)...
  5. Hi Yidan, I looked at your model and I noticed...

    Hi Yidan,

    I looked at your model and I noticed that the contact interface your created with the MCL includes not only cartilage but part of the tibia, which is a rigid body. In that case, since a...
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    163

    Hi Fatama, To figure out R you need to decide...

    Hi Fatama,

    To figure out R you need to decide what's the pressure you expect in your blood vessel (e.g., 100 mmHg?) and the volumetric flow rate (which is the product of the cross-sectional area...
  7. Hi, A material that deforms permanently, like...

    Hi,

    A material that deforms permanently, like play-doh, would be best described as an elasto-plastic material. Currently FEBio does not have a material model for plastic behavior of solids,...
  8. Replies
    3
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    163

    Hi Fatama, If the velocity or pressure are...

    Hi Fatama,

    If the velocity or pressure are unknown at the outlet, the best you can do is to propose a relation between them that (hopefully) replicates the conditions of your real-world system. ...
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    Hi Kinga, I have attached the file used in...

    Hi Kinga,

    I have attached the file used in that paper, for the case where cF=-100 (2006). Please take a look and see how it compares to your analysis. Let me know if you have questions.

    Best,...
  10. Hi Laura, That should be fine, as long as your...

    Hi Laura,

    That should be fine, as long as your experiments show that the tissue stiffens as you decrease the salt concentration in the bath.
    When you use a Donnan equilibrium model, the...
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    Hi Kinga, Yes, both should be applied to...

    Hi Kinga,

    Yes, both should be applied to reproduce that initial equilibrium state.

    Let me know if you need further clarifications.

    Best,

    Gerard
  12. Hi Laura, Yes, you do need a boundary...

    Hi Laura,

    Yes, you do need a boundary condition that allows the fluid to exit, or else there will not be much of a transient response. This is typically done by prescribing zero fluid pressure on...
  13. Hi Laura, A biphasic material does not...

    Hi Laura,

    A biphasic material does not strictly account for swelling, though the fluid pressure boundary condition may be used to simulate osmotic loading (shrinking) under the assumption that the...
  14. Hi Mousa, Happy New Year to you as well. ...

    Hi Mousa,

    Happy New Year to you as well.

    Sorry, I had missed the part where you said that both contact surfaces are rigid. In that case auto-penalty should not be used (it won't work since...
  15. Hi Mousa, In the simplest case (i.e., when...

    Hi Mousa,

    In the simplest case (i.e., when laugon=0, penalty=1, auto_penalty=0), the contact pressure is equal to the contact gap, since (contact pressure) = penalty*(contact gap). In practice,...
  16. 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
  17. 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
  18. Replies
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    325

    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...
  19. 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...
  21. 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...
  22. 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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