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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:
@ Bruno Chareyre

Thanks for explaining more on getting p and q. I use 0.5*Sij*Sji to
calculate deviatoric stress invariant J2 and then q. [1]

I mentioned about Eigen because I was expecting some nonlinear equations
solver in the library Eigen3. Sorry for making it confusing.

BTW, I found the products of bodyStressTensors(), per-particle stress
matrices, not symmetric. Is this supposed to be normal?

[1] http://www.rockmechs.com/stress-strain/stress/deviatoric-stress-and-
invariants/

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