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[Jérôme Duriez <question314841@xxxxxxxxxxxxxxxxxxxxx>]

Question #314841 on Yade changed:
https://answers.launchpad.net/yade/+question/314841

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Then a first problem in your script is "stressMask = 0" for TriaxialStressController. With such value for stressMask, all goal1/2/3 are strain rates, not stress.
Also (which is harmless, though) definition of maxMultiplier / finalMaxMultiplier is useless when internalCompaction=True

Applying constant zero stress along x and z axis and a constant tensile strain rate along y axis just requires
stressMask = 5 (101 in binary format)
goal1 = goal3 = 0
goal2 = someStrainRateValue

Then the walls will move consistently with uniaxial tension. Whether
your sample will develop tensile stress depends on other parameters of
the simulation (contact law in the packing, and between the packing and
the rigid boundaries)

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