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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