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Keep eigenvector of a stress tensor FIXED when eigenvalue becomes positive?
Posted Aug 12, 2019, 6:11 p.m. EDT Structural & Acoustics, Geomechanics, Structural Mechanics Version 5.4 1 Reply
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Dear all,
I am working on a mechanical problem of tensile failure. What I want to achieve is to Keep the eigenvector of a stress tensor FIXED when its eigenvalue becomes positive. That means I want to record the eigenvector at the moment when its corresponding eigenvalue becomes positive.
Do you have any ideas to do that?
Thank you for your time and help.
-------------------Yu Zhang
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Hi,
I would suggest coding the constitutive relation yourself through the External Material functionality. There you can easily store the state variables that you need, for example the normal of crack plane.
Regards,
Henrik
Henrik Sönnerlind
COMSOL