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  1. Replies
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    Hi Steve, Thank you for reply. It seems I...

    Hi Steve,

    Thank you for reply.

    It seems I am facing the problem of boundary conditions (BC) I produced from 4D CT. Rigid bodies model with produced BC mimics well the kinetic of 4D CT movement....
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    Thank you Steve. I will take this into account.

    Thank you Steve. I will take this into account.
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    Cauchy stress and stretch output data

    Dear

    1) In FEA model I am using BC extracted from 4DCT movement. These BC are simultaneous displacements in x,y,z and rotations in Rx, Ry and Rz. I have experimental uniaxial tensile data Cauchy...
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    The problem was solved. The large deformation...

    The problem was solved. The large deformation causes long run. By refining the deformation improves not only the convergence but CPU time as well.
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    long duration of calculation

    Hello,

    In my FEA there are viscoelastic+2nd order Ogden material models, hex meshed single bar and boundary conditions extracted from 4D CT scan which capture the extension-flexion-extension of...
  6. 2046For inverse fitting of viscoelastic...

    2046For inverse fitting of viscoelastic properties I have chosen load followed by unloading. The analysis is static. For material model I am using uncoupled viscoelastic (block material) with Ogden...
  7. Inverse fitting viscoelastic properties

    Hi Steve,

    I am using the material (polycaprolactone) for FEA models which exhibits viscoelastic properties (figure of cyclic from 10% strain control shows viscoelastic behaviour from second...
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    Hi Steve, Where can I find the release notes...

    Hi Steve,

    Where can I find the release notes on 2.9.1 version of Febio? I am using 2.5 and want to understand changes I have to implement to use 2.9.1 version.

    Regards,
    Nataliya
  9. Replies
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    Hi Steve, It seems that I solved the problem...

    Hi Steve,

    It seems that I solved the problem with interpolation of data. But there is still the question about the interpretation of FEA results.

    For material properties I am using values...
  10. Replies
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    I had a thought about BC from 4DCT. Even if I get...

    I had a thought about BC from 4DCT. Even if I get refined 4DCT (more frames which will give refined distances in x y and z and smooth rotation in rx ry and rz), will it help with convergence?
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    I choose the first case and fixed it. However, I...

    I choose the first case and fixed it. However, I constantly receive Negative Jacobian. I use hex8 mesh in the bar. What would be the best mesh to use?
  12. Replies
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    20122011Hi Steve, 1) I have a simple bar where...

    20122011Hi Steve,

    1) I have a simple bar where the end and the start of the bar (surfaces) will be rigid bodies and the body of the bar is a material. I want to apply the displacement and rotation...
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    Hi Steve, I have finished with inverse fitting...

    Hi Steve,

    I have finished with inverse fitting elastic properties and now I am experiencing the volume mesh issue. It seems that my volume mesh has that many elements that I receive this message...
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    Hi Steve, What would be the best way to...

    Hi Steve,

    What would be the best way to inverse fitting the uniaxial tensile data: (1) load versus displacement or (2) stress versus strain?

    Regards,
    Nataliya
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    Hi Steve, Thank you , I have sent feb file to...

    Hi Steve,

    Thank you , I have sent feb file to you.

    Cheers,
    Nataliya
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    Hi Steve, I determined the load curve [0 0;...

    Hi Steve,

    I determined the load curve [0 0; time and displacement] and its working. However, I still do have the question, the experimental displacement is -0.33 mm/s and time 3.6 s. With these...
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    Hi Steve, I have not prescribed properly the...

    Hi Steve,

    I have not prescribed properly the load curve indeed. Do you suggest to prescribe the displacement in the load curve [0 0; time_step displacement] where time=time_step * number of time...
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    Hi Steve, I did not miss the boundary...

    Hi Steve,

    I did not miss the boundary conditions. Why there is no load applied at time step over 1s time? When I lower min residual , the warning of max nr of reformations shows up with 200 max ...
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    Try to use postview on windows. It worked for me....

    Try to use postview on windows. It worked for me.

    Cheers
    Nataliya
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    I have tried following FEA control settings:...

    I have tried following FEA control settings:
    numTimeSteps=40; %Number of time steps desired to reach yield strength
    max_refs=200; %Max reforms
    max_ups=10;
    opt_iter=10; %Optimum...
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    1931 Hi Steve, I so much appreciate for...

    1931

    Hi Steve,

    I so much appreciate for FEBio support. Cannot imagine what would I do without this great help.

    I want to fit true stress-strain experimental data up to yield strength...
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    Hi Steve, Thank you, yes, it is working ...

    Hi Steve,

    Thank you, yes, it is working



    Cheers,
    Nataliya
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    Hi Steve, My unit system is mm for geometries...

    Hi Steve,

    My unit system is mm for geometries of objects, in Neo-Hookean model I used MPa for Young’s modulus and scalar value for poison ration (0.49). My intention was to use poisson ratio over...
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    strain units in postview

    Hi,

    What is unit for strain in postview: mm/mm or %

    Cheers,
    Nataliya
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    Hi Steve, I got these messages while running...

    Hi Steve,

    I got these messages while running op files

    Reading file op01.feb ...FAILED!
    FATAL ERROR: febio_spec tag was not found. This is not a valid input file.

    Reading file op02.feb...
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