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  1. Replies
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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...
  2. Replies
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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
  3. Replies
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    1,217

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

    Hi Steve,

    Thank you , I have sent feb file to you.

    Cheers,
    Nataliya
  4. Replies
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    1,217

    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...
  5. Replies
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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...
  6. Replies
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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 ...
  7. Replies
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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
  8. Replies
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    1,217

    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...
  9. Replies
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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...
  10. Replies
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    1,217

    Hi Steve, Thank you, yes, it is working ...

    Hi Steve,

    Thank you, yes, it is working



    Cheers,
    Nataliya
  11. Replies
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    272

    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...
  12. Replies
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    strain units in postview

    Hi,

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

    Cheers,
    Nataliya
  13. Replies
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    1,217

    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...
  14. Replies
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    inverse fitting model

    Hi,

    I have raw uniaxial tensile data (force vs displacement) from rectangular sample. I want to try fit raw data with Neo-Hookean material model (Young's modulus and Poisson's ratio). I might have...
  15. Replies
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    224

    suitable material model

    Dear,

    I have the experimental data (uniaxial tensile and cyclic tensile data) on the 3d printed PCL (plastic) scaffold, picture is enclosed. What kind of material model will you suggest to use...
  16. Replies
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    Hi Steve, Hope I understood you correctly. ...

    Hi Steve,

    Hope I understood you correctly.

    Following your advice I created single load curves for prescribed constraints, for example, load curve 1 [0 0; 0.3 X1; 0.6 X2; 0.9 X3] for...
  17. Replies
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    Hi Steve, If you meant the multiple step...

    Hi Steve,

    If you meant the multiple step analysis, I have some questions. I created multiple step analysis where at first step load curves [0 0; 0.3 N] where N is displacement/rotation in x y and...
  18. Replies
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    Hi Steve, Do you mean by multiple time steps,...

    Hi Steve,

    Do you mean by multiple time steps, the multiple step analysis? Do you have an example of multiple time steps analysis?

    I do use auto time stepper indeed. When I comment the auto time...
  19. Replies
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    Hi Steve, I did not quite understand, multiple...

    Hi Steve,

    I did not quite understand, multiple time steps happen via max_retries value or via interpolation of transformation matrix in your above answer? Another question, if initial guess is...
  20. Replies
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    Hi Steve, I set max_retries to 10 and it seems...

    Hi Steve,

    I set max_retries to 10 and it seems working with original 4DCT boundary conditions (displacement and rotation). It takes time and I can see repetitive Negative Jacobian detected in...
  21. Replies
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    Hi Steve, Would it be the solution to smoothly...

    Hi Steve,

    Would it be the solution to smoothly interpolate the motion if needed?Is in principle the final stress state at any stage is history independent (for pure elastic simulations) in Febio?...
  22. Replies
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    1,767

    Hi Steve, From two rigid bodies I passed to...

    Hi Steve,

    From two rigid bodies I passed to three bodies (two rigid bodies connected by soft tissue with Ogden material model) and model fails with Negative Jacobian when I t ry to run it. I made...
  23. Replies
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    1891 Hi Steve, I solved the issue and want...

    1891

    Hi Steve,

    I solved the issue and want to thank you for your great support. I think it will be fair to share some experiences here helping next user of FEBio to avoid what I have...
  24. Replies
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    1,767

    Hello Steve, Is the rotation of rigid object...

    Hello Steve,

    Is the rotation of rigid object in febio happens around the centre of mass of rigid body?

    It looks like the rotation generated by matlab function I am using for alignment happens...
  25. Replies
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    Hi Steve, The displacement and rotation in...

    Hi Steve,

    The displacement and rotation in Febio are prescribed to instant position of object (i) or reference position of object (0)?
    What should the unit for displacement and rotation?
    Cheers,...
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