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  1. Hi Gerard, I am using FEBio 2.5.0. I will try...

    Hi Gerard,

    I am using FEBio 2.5.0. I will try version 2.9 then.

    Best,
    Sheng
  2. Holzapfel-Gasser-Ogden material (solid mixture) convergence problem

    Hi,

    I have a human thigh model with the muscle and fat tissues described by Ogden material, and skin described by Holzapfel-Gasser-Ogden material as shown in the following post: ...
  3. Hi Gerard, Thanks for the reply! Can I get a...

    Hi Gerard,

    Thanks for the reply! Can I get a bit more info about what performance is not satisfiable so far, so that I know what to test and what the risk would be?

    And just to confirm again,...
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    Hi Jeff, Thanks for replying. It is very...

    Hi Jeff,

    Thanks for replying. It is very helpful!

    Best,
    Sheng
  5. Gasser-Ogden-Holzapfel-uncoupled model parameter setup

    Hi,

    I have a few questions regarding the parameter setup for the Gasser-Ogden-Holzapfel-uncoupled model.

    <material id="1" name="Material1" type="Gasser-Ogden-Holzapfel-uncoupled">...
  6. Replies
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    429

    reading xplt file results.

    Hi,

    I am wondering if the febio results file (.xplot) can only be read by Postview, or they can be read by other FE post-processing software as well?

    Thank you!

    Best,
    Sheng
  7. Hi Steve, I tried preview 2.1.4. For Spec2.5,...

    Hi Steve,

    I tried preview 2.1.4. For Spec2.5, it saves user selected element set in <ElementSet> in <Geometry> with global ID. This is exactly what I want. For spec 2.0, it does not save user...
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    convergence problem related to of fiber

    Hi,

    I have this thigh model that have skin, muscle, and fat component. I am using Ogden for muscle and fat, Moonery-Rivlin with two fiber family for skin shell elements. Femur are set as rigid...
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    display axes name in preview 2.2

    Hi,

    I couldn't figure out a way to display the axes name in preview 2.2.
    1818

    Can someone let me know how to turn the axes names (x, y, z) on?

    Thank you!

    Best,
  10. Replies
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    348

    Hi Steve, Thanks for the clarification. This...

    Hi Steve,

    Thanks for the clarification. This is much clearer than the user manual. I think I understood the order of coordinate definition wrong.

    There are still a few terms I might need...
  11. Hi Steve, That would be awesome. Best,...

    Hi Steve,

    That would be awesome.

    Best,
    Sheng
  12. Hi Steve, Thanks for the clarification. The...

    Hi Steve,

    Thanks for the clarification. The reason I'd like to see user defined element sets in the feb file is that I want to group elements into different groups and define fiber directions...
  13. Replies
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    Hi Steve, Thanks for the reply! I am sorry...

    Hi Steve,

    Thanks for the reply! I am sorry that I am still confused. I wonder what does (0,1,0) and (0,0,1) here mean. Does it mean e1, e2, e3 are (1,0,0), (0,1,0), and (0,0,1), respectively?
    ...
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    Hi Steve, Thanks for the clarification. Now I...

    Hi Steve,

    Thanks for the clarification. Now I understand the relationship between global ID and local ID.

    Does format 2.5 still support global ID in sections like <ElementData>, if I do know...
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    defining axes using a and d vectors

    Hi,

    In the FEBIO user manual 4.1.1 (5), there is a description about using a and d vector defind axes:

    "FEBio generates a set of orthogonal material axes as described in Section 4.1.1.2....
  16. export named selection in preview to feb file

    Hi,

    I noticed that the elements I selected and saved in "Named Selection" in preview do not show up in the feb file (either febio spec 2.0 or spec 2.5). However, the nodes I saved in "Named...
  17. Hi Gerard, Thanks for the clarification! ...

    Hi Gerard,

    Thanks for the clarification!

    Best,
    Sheng
  18. Hi Gerard, Thanks for the reply! Does it...

    Hi Gerard,

    Thanks for the reply!

    Does it mean febio2.5.0 was calculating it wrong? I did some tryouts to ensure the fiber information being considered properly. The y-stress distribution in...
  19. Hi Gerard, Thanks for the reply! I think the...

    Hi Gerard,

    Thanks for the reply! I think the <mat_axis type="vector"> in ElementData and <fiber type= “angles”> within in solid section would work for my case pretty well. However there are still...
  20. model converge in febio2.5.0 but does not converge in febio2.8.5

    Hi,

    I have this simple tryout model that converge in febio2.5.0 but doesn't converge in febio2.8.5 (after changing fibers-3d-gkt-uncoupled to fibers-3d-gkt). Can I get some help to spot the issue?...
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    local id vs. id in ElementData

    Hi,

    I noticed that in febio spec version 2.5, Elements are identified using local id, like

    <ElementData var="shell thickness" elem_set="Part4">
    <elem lid="1">2,2,2,2,2,2</elem>
    <elem...
  22. define prefered directions for two continously distributed fibers

    Hi,

    I am trying to define an uncoupled solid mixture material that is made up of a neo-Hookean ground matrix and two families of collagen fibers that are continuously distributed following...
  23. Hi Steve, Thanks for the Clarification! ...

    Hi Steve,

    Thanks for the Clarification!

    Best,

    Sheng
  24. Hi Gerard, It works now following your...

    Hi Gerard,

    It works now following your instruction. Thank you!

    Does it mean in 2.8.5 version the three pairs of integration scheme "fibers-3d-gkt" vs. "fibers-3d-gkt-uncoupled",...
  25. febio 2.8.5 & 2.8.6 does not read Gauss-Kronrod Trapezoidal Rule

    Hi,

    I defined an uncoupled solid mixture for skin properties in my model, as shown below:
    </material>
    <material id="4" name="skin mr" type="uncoupled solid mixture">
    <solid...
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