Question #706553 on Yade changed:
https://answers.launchpad.net/yade/+question/706553
Status: Open => Answered
Karol Brzezinski proposed the following answer:
Hi Leonard,
triax.goal2=rate
triax.goal1=-0.5*rate
triax.goal3=-0.5*rate
Comes from the fact that volumetric strain is equal to e11+e22+e33 for
small deformations. One assumes e22=e33 and wants e11+e22+e33 = 0. So
2*e22 = -e11, hence e22=e33=0.5*e11.
The error comes from the inaccuracy of the formula for large strains
(apparently, your strains are large if the error is not acceptable). You
can propose your own triax.goals by taking into account that the actual
volumetric strain is (1+e11)*(1+e22)*(1+e33).
Cheers,
Karol
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