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[Chareyre <question688979@xxxxxxxxxxxxxxxxxxxxx>]

Question #688979 on Yade changed:
https://answers.launchpad.net/yade/+question/688979

    Status: Open => Answered

Chareyre proposed the following answer:
You are imposing 9 components, not 1:
> O.cell.velGrad=Matrix3(0,0,-0.01,0,0,0,0,0,0)

Bruno

Le ven. 28 févr. 2020 20:22, yangsiyuan <
question688979@xxxxxxxxxxxxxxxxxxxxx> a écrit :

> Question #688979 on Yade changed:
> https://answers.launchpad.net/yade/+question/688979
>
>     Status: Answered => Open
>
> yangsiyuan is still having a problem:
> The strain rate I'm applying is the shear strain rate, not the normal
> strain rate. It points to the X-axis inside the zx plane.
> I can change direction periodically
> The effective stress is calculated directly by getstress ().
> Stressmask =0 is adjusted as a strain control, which can reflect the
> change of effective stress during the shear phase. And the effective stress
> will no longer maintain a constant value.
> Because the load applied during the shear phase is cyclic shear strain
> rate rather normal strain rate. This can be done through o.c.velgrad.
> Therefore, there is no need to set triaxial.goal during the shear phase.
> By the way, what happens if you don't set triax.goal, is there any
> influence on the effective stress.
>
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