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  1. Replies
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    Hi Ankush, You could try doing a multistep...

    Hi Ankush,

    You could try doing a multistep analysis with different dtmin in each step.

    Best,
    Scott
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    1
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    1,240

    20 node hexahedrons

    Hi Folks,

    I was wondering if these elements when used with a biphasic material are quadratic in both the solid and fluid phases, or if they are like pore-pressure elements in ABAQUS (quadratic for...
  3. Replies
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    2,966

    Hi Steve, I tried using periodic BCs in...

    Hi Steve,

    I tried using periodic BCs in version 1.8.0.5066 (linux 64bit) and get a Segmentation fault. I've attached the model.

    Regards,
    Scott

    EDIT: The attachment uploader isn't working...
  4. Replies
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    3,043

    Dr. Ateshian, I want the membrane permeability...

    Dr. Ateshian,

    I want the membrane permeability to increase with tensile strain. After reading your reply, I realize for low Poisson ratio's this would already be the behavior for positive values...
  5. Replies
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    3,043

    Holmes-Mow Permeability M >= zero constraint

    Hi Folks,

    Is there a reason for requiring that M is >= 0 for the Holmes-Mow model? I know it does't really make physical sense to increase permeability with decreased volume and thus pore size,...
  6. Replies
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    2,297

    Dr. Ateshian, Were these absolute tolerances...

    Dr. Ateshian,

    Were these absolute tolerances added to version 1.8. If so, what are their keywords? pmin and dmin aren't recognized.

    Thanks,
    Scott
  7. Replies
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    17,003

    Hi Folks, Defining the mat_axis in terms of...

    Hi Folks,

    Defining the mat_axis in terms of the local element numbering in this problem is problematic since it has both penta6 and hex8 elements, and the local element numbering will not result...
  8. Dr. Ateshian, Well that makes things easy. ...

    Dr. Ateshian,

    Well that makes things easy. It's working great. Convergence is much improved as well.

    Scott
  9. Dr. Ateshian, I'm currently working on the...

    Dr. Ateshian,

    I'm currently working on the problem of a rigid impermeable indenter on biphasic cartilage. I've taken the following approaches:

    1. Non-draining (no BC) in contact region and p=0...
  10. Parametric definitions of material properties, boundary conditions, etc.

    Hi Folks,

    Is there currently any way to define parametric constants in a .feb file, and then express model attributes as a function of those properties?

    For example something like this,


    ...
  11. Biphasic EFD Neo-Hookean spends substantial amount of time outside of solver

    I just completed a mesh convergence study using this material (fluid component using constant isotropic permeability), and noticed a large amount of the time was spent outside the solver. The...
  12. Replies
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    Thanks Steve. We'll definitely want to give the...

    Thanks Steve. We'll definitely want to give the iterative solver a try when it's implemented. Especially for these cell-scale models, since they should have a pretty well-conditioned stiffness...
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    2,749

    Estimating Memory Usage in Pardiso

    Hi Folks,

    We're running a large model with 32585467 non-zero entries in the stiffness matrix and 609762 equations. I would like to get a ballpark estimate of how much memory is required if we use...
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    1,790

    Hi Kun, This torsion is a product of your mesh...

    Hi Kun,

    This torsion is a product of your mesh structure as was discussed in the thread you linked. Imagine folding the beam on the middle of its long axis. With the current mesh the triangles...
  15. Replies
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    14,323

    Sticky: Hi Dave, Our lab has used FEBio in the...

    Hi Dave,

    Our lab has used FEBio in the following extended abstracts:

    Sibole, S., Bennetts, C., Borotikar, B., Maas, S., van den Bogert, A. J., Weiss, J. A. and Erdemir, A. Open knee: a 3D...
  16. Replies
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    4,537

    Hi Kun, Yes, fixing the other rotational...

    Hi Kun,

    Yes, fixing the other rotational degrees of freedom will address the issue I was talking about. Basically, with the original constraints the problem was statically under-determined.
    ...
  17. Replies
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    4,537

    Hi Kun, The tri.feb file included in data.zip...

    Hi Kun,

    The tri.feb file included in data.zip did not close the the xml node block in the fix boundary conditions. However, that doesn't seem to affect the results. Since you only prescribe the...
  18. Replies
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    4,537

    Hi Kun, The xml elements in your set of fixed...

    Hi Kun,

    The xml elements in your set of fixed boundary conditions aren't closed in tri.feb. i.e.


    <node id="1" bc="xyz"/>

    should be:
  19. Replies
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    Hi Dave, I'm running Fedora 13. With some...

    Hi Dave,

    I'm running Fedora 13. With some grumbling our unix administrator was able to fix the problem. Apparently, libstdc++ 3.5 is only available in the yum repository for Fedora 14, which is...
  20. Replies
    2
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    1,917

    1.3.3 Linux 64 bit Library missing

    Hi Steve,

    I just downloaded version 1.3.3 for linux 64 bit and it gives an error for a missing/outdated library

    /usr/lib64/libstdc++.so.6: version `GLIBCXX_3.4.14' not found

    In the past,...
  21. Replies
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    2,254

    Hi Kamel, If you output all the components of...

    Hi Kamel,

    If you output all the components of the Green-Lagrange strain tensor you can calculate the Jacobian as:

    J = sqrt[det(2E + I)]

    where E is the strain tensor and I is the Identity.
    ...
  22. Replies
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    Hi Fernando, This must be a discrepancy...

    Hi Fernando,

    This must be a discrepancy between the windows and the linux versions. I used linux and assume you used windows? The only other possibility I can think of is if the log file was...
  23. Replies
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    3,007

    Hi Fernando, Are you sure you're only getting...

    Hi Fernando,

    Are you sure you're only getting the first step, or did your analysis converge in 1 step? I use the same format (without the name attribute), and get all converged steps in 1 file. ...
  24. Replies
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    Okay, I think I vaguely understand. Increasing...

    Okay, I think I vaguely understand. Increasing alpha increases the influence of the term which averages elements shared by a node on that node, correct?

    ~Scott
  25. Replies
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    Hi Steve, In the article: M. A. Puso and J....

    Hi Steve,

    In the article:

    M. A. Puso and J. Solberg, A stabilized nodally integrated tetrahedral, International Journal for Numerical Methods in Engineering, vol. 67, no. 6, pp. 841-867,...
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