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[Hongyang Alex Cheng <question251712@xxxxxxxxxxxxxxxxxxxxx>]

Question #251712 on Yade changed:
https://answers.launchpad.net/yade/+question/251712

Hongyang Alex Cheng posted a new comment:
Thanks, Anton

Due to my limited knowledge I haven't seen any formulation for contact
stress like in [1], but I'll check it.

If I am not mistaken, [1] returns normal stress and tangential stress at
particle contact level. I've been thinking whether it's better to export
mean stress p and deviatoric stress q for post-processing instead of
normStress and shearStress. That's why I raised my second question. Here
is the nonlinear equations I wanna solve where si (i=1,2,3) are
principal stresses, I1, I2 and I3 are three stress invariants.

s1+s2+s3 = I1
s1*s2+s2*s3+s3*s1=I2
s1*s2*s3=I3

[1] https://github.com/yade/trunk/blob/master/pkg/dem/Shop_02.cpp#L176

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