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Re: [Question #266331]: How to intepret strain tensor and its deviator

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From: Bruno Chareyre <question266331@xxxxxxxxxxxxxxxxxxxxx>
Date: Sun, 03 May 2015 12:46:25 -0000
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Question #266331 on Yade changed:
https://answers.launchpad.net/yade/+question/266331

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
Hello,
TW actually returns the displacement gradient tensor, that is why it can be non-symmetric. Take the symmetric part to keep only the "strain" part.
Deviator is the second invariant, s_ij*s_ij where "s" is the deviatoric part of the strain tensor..
Magnitude is e_ij*e_ij, the L_2,1 norm of the tensor (just like the second invariant is the norm of the deviatoric part).
Bruno

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