View Fracture/Crack Analysis in Postview/FEBio

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  • aboppana
    Junior Member
    • Jul 2015
    • 2

    View Fracture/Crack Analysis in Postview/FEBio

    Hi,

    We have a femur model which we have applied some loads to in Preview, and run through FEBio. The material properties are set as the following:

    neo-Hookean:
    density=3.88
    Young's Modulus = 164.7
    Poisson's = .25

    These values are just being used to test our model and train ourselves on FEBio, they are not 100% accurate for the femur.

    We expect the model to bend until failure, and create a crack along the point of failure. However, Postview just shows the model bending, and we can see where the stresses are maximum. Is there any way to see where the model created a crack in Postview?

    We have attached our Preview, FEBio and Postview files. The .zip file includes both the Preview and Postview files.

    Thank you!
    Attached Files
  • maas
    Lead Code Developer
    • Nov 2007
    • 3400

    #2
    Hi,

    FEBio does not handle fracture so the femur will not crack. It will just bend more if you increase the force.

    Fracture is something we have not looked into. It is actually quite challenging to model the process of fracture accurately numerically. What I know people have done instead is see if the applied loading generates stresses that are higher than the known failure stress (known from e.g. experimental data). In that case, although the numerical model doesn't break, it is safe to assume that the model would break under similar experimental conditions. Hope this helps.

    Cheers,

    Steve
    Department of Bioengineering, University of Utah
    Scientific Computing and Imaging institute, University of Utah

    Comment

    • aboppana
      Junior Member
      • Jul 2015
      • 2

      #3
      Steve,

      Thank you for the guidance. We'll look into the stresses and failure stresses to see if we can generate our own crack-data from that.

      Thanks!
      Abhishektha

      Comment

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