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Thread: a question about ellipsoidal fiber distributed material?

  1. #1

    Default a question about ellipsoidal fiber distributed material?

    Hi everybody
    I have a question about ellipsoidal fiber distributed material which is describe in FEBio user manual p.125. In the manual the Cauchy stress tensor is described as follows:

    Capture.JPG

    apparently, n shows the unit vector along fiber direction in current configuration, but in the reference (Ateshian et al. 2009) the same formulation was represented but n denotes the unit vector along fiber direction in reference configuration. I want to know which one is correct?

    Thanks,
    Faezeh

  2. #2
    Join Date
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    Hi Faezeh,

    The user's manual is incorrect. The n vector is defined in the reference configuration.

    Cheers,

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

  3. #3

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    Hi Steve

    Thanks, and what about (teta, phi). Are they in global coordinate or local?

    Thanks,
    Faezeh

  4. #4
    Join Date
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    I believe they are in the local coordinates defined by the mat_axis tag. So, if you have not defined a mat_axis tag in the material definition, they should be global coordinates.

    Cheers,

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

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