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  1. Replies
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    Hi, You can use shell elements to simulate...

    Hi,

    You can use shell elements to simulate very thin membranes. This would require you to create a surface mesh only, and it doesn't have to be too fine.

    Best,

    Gerard
  2. Hi Sinba, Would you be able to share your...

    Hi Sinba,

    Would you be able to share your model file with me? This would help me understand the issue better.

    Best,

    Gerard
  3. Hi Kuo, I don't use Abaqus at all, so...

    Hi Kuo,

    I don't use Abaqus at all, so unfortunately I can't help you with this question. Maybe another forum user can assist you?

    Best,

    Gerard
  4. Hi Kuo, In the literature the Neo-Hookean...

    Hi Kuo,

    In the literature the Neo-Hookean material is often described as a special case of the Mooney-Rivlin material, which is an incompressible solid. In FEBio, the "neo-Hookean" material is a...
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    Hi Alex, That study (and others that use...

    Hi Alex,

    That study (and others that use biphasic materials in FEBio) use quasi-static analyses (which is the default analysis type for biphasic materials), so they can model transient responses...
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    Hi Alex, None that conserve energy, currently....

    Hi Alex,

    None that conserve energy, currently.
    The outcome of dynamic analyses using contact interfaces may be unpredictable. For example, if a cube of elastic material is dropped under the...
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    Hi Yidan, I assume that your knee model...

    Hi Yidan,

    I assume that your knee model involves contact interfaces. FEBio's sliding contact interfaces are not yet designed to work with dynamic analyses. That's probably why you are seeing...
  8. Hi Susanne, Ben looked into this problem and...

    Hi Susanne,

    Ben looked into this problem and analyzed it using FEBioStudio 1.0.2 on Windows. He confirmed that the run terminates prematurely. We are looking into this bug and will try to...
  9. Hi Alexander, This is great, thanks for...

    Hi Alexander,

    This is great, thanks for sharing this link. I will look into it.

    Best,

    Gerard
  10. Hi Alexander, No, the "viscoelastic" material...

    Hi Alexander,

    No, the "viscoelastic" material analyzes quasilinear viscoelasticity, which means that the relaxation functions cannot be strain-dependent.

    The "reactive viscoelastic" material...
  11. Hi Susanne, The FEBio website shows that...

    Hi Susanne,

    The FEBio website shows that version 1.0.2 was posted just yesterday, see https://febio.org/downloads/.

    Would you please download that version and try it out? In the meantime I...
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    Hi Amevi, I already implemented the fixes in...

    Hi Amevi,

    I already implemented the fixes in the development versions of FEBio3 and FEBioStudio. I am not sure when they will become available, but if you are using the Mac operating system I can...
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    Hi Amevi, The FEBio source code shows me...

    Hi Amevi,


    The FEBio source code shows me that this is not an uncoupled material. So the fact that it shows up that way on FEBioStudio is an error that needs to be fixed.

    Here also, looking...
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    Hi Elliott, This is what you should see when...

    Hi Elliott,

    This is what you should see when examining the repository on FEBioStudio for the FSI Paper Examples.
    2304
    If you don't see the same thing, would you please share a screen dump of...
  15. Hi Susanne, I downloaded Jeff's model and also...

    Hi Susanne,

    I downloaded Jeff's model and also the latest FEBioStudio1.0.2 and I was able to run his model to completion. (I am using the Mac version.) The model doesn't crash for me. Can you...
  16. Thread: Febio units

    by ateshian
    Replies
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    63

    Hi Vaishakh, When the units of force are [N],...

    Hi Vaishakh,

    When the units of force are [N], the force you need to apply is simply 100 kg x 9.8 m/s^2 = 9800 N. This assumes that you are applying the force directly, without using a body force...
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    Hi Fluvio, Self-contact is allowed in the...

    Hi Fluvio,

    Self-contact is allowed in the sliding contact interfaces. Just select the same surface(s) as primary and secondary. When using sliding-elastic contact, make sure to reduce the...
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    Hi Kostas, angtol refers to the maximum angle...

    Hi Kostas,

    angtol refers to the maximum angle (radians) allowed between the axis of rotation on rigid body A and that on rigid body B. A tight tolerance would be e.g., angtol=0.001.

    When using...
  19. Hi Shu, I sent you an email with a link to the...

    Hi Shu,

    I sent you an email with a link to the executable earlier today.

    Best,

    Gerard
  20. Hi Vaishakh, There are are two options for...

    Hi Vaishakh,

    There are are two options for modeling FRPVE materials:

    1) The <solid> component of a <biphasic> material may be selected to be of type "viscoelastic". The <elastic> component of...
  21. Hi Sinba, It is hard to tell what causes your...

    Hi Sinba,

    It is hard to tell what causes your model to fail. For the third step it would seem to me that you should perform a contact analysis, though you say that you are trying to avoid that. ...
  22. Hi Shu, I had to modify the source code to...

    Hi Shu,

    I had to modify the source code to allow the parameter "b" to be specified in the <MeshData> section. Which operating system are you using? If Mac, I can share the updated executable...
  23. Hi Adam, FEBioStudio is the proper tool for...

    Hi Adam,

    FEBioStudio is the proper tool for importing v2.5 files and exporting them into v3. If you get an error importing a file, that means the file contains either an incorrect statement, or...
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    Hi Heiko, Yes, if you use

    Hi Heiko,

    Yes, if you use <febio_spec version="2.5"> you can do that in the <MeshData> section (following </Geometry>):


    <MeshData>
    <ElementData...
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    Hi David, Search radius is a scale factor...

    Hi David,

    Search radius is a scale factor which is multiplied by the model size (the diagonal of the box enclosing the entire model) to produce a scaled distance D. When performing a contact...
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