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[Question #703730]: Stress Path Control under Constant Volume

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From: Gianni Pellegrini <question703730@xxxxxxxxxxxxxxxxxxxxx>
Date: Sat, 05 Nov 2022 08:25:37 -0000
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New question #703730 on Yade:
https://answers.launchpad.net/yade/+question/703730

Hello,
I am simulating undrained triaxial testing. 
To maintain the hypothesis of constant volume, I am prescribing the following constraints to the strains (as explained several times in past questions):

O.cell.velGrad=Matrix3(-rate, 0, 0, 0, rate/2, 0, 0, 0, rate/2)

I wonder if it would be possible to maintain this constraint and at the same time, impose a given stress history in one direction, e.g. sigma1
Before attempting to implement a code in python, I thought to ask you if this problem has been already resolved and if there is a specific controller for it
Many thanks


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