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[Jérôme Duriez <question266331@xxxxxxxxxxxxxxxxxxxxx>]

Question #266331 on Yade changed:
https://answers.launchpad.net/yade/+question/266331

Jérôme Duriez proposed the following answer:
s_ij * s_ij is s11^2 + s12^2 + s13^2 + s21^2 ...., see Einstein
convention.

Where s is equal to : 
strainTensor - 1/3 * tr(strainTensor) * idendityTensor
(deviatoric part definition in 3D)

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