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[Chiara Modenese <question159394@xxxxxxxxxxxxxxxxxxxxx>]

Question #159394 on Yade changed:
https://answers.launchpad.net/yade/+question/159394

    Status: Answered => Open

Chiara Modenese is still having a problem:
On 31 May 2011 17:35, honzik <question159394@xxxxxxxxxxxxxxxxxxxxx>
wrote:

> Your question #159394 on Yade changed:
> https://answers.launchpad.net/yade/+question/159394
>
>    Status: Open => Answered
>
> honzik proposed the following answer:
>
> >Vaclav did not use it and Jan wrote his own controller, but I let him add
> a
> >comment on all of this (could not you add your opinion, Jan?).
>
> Of course I could :-) but as I don't know PeriTriaxController and
> similar engines very well and having not so much time just now, could
> you please summarize your discussion here for me (if you still want my
> opinion)?
>
That is fine, Jan. It proves that I was right to say that the static method
was not used before (afaik). The line in question is

(in PeriTriaxController)
strain_rate=1/scene->dt*(goal[axis]-stress[axis])*cellArea[axis]/(stiff[axis]>0?stiff[axis]:1.);

To me, this needs to be adjusted. Am trying to do something with that now, I
hope that nobody will mind if I change something in the pertinent code (for
the static solution, at least).
Cheers.
Chiara

>
> in the discussion there was mentioned using stiffness.. for
> stress/strain control of periodic cell, we tried to compute stiffness of
> whole cell according to published formulas, but the formulas itself were
> only approximation, so we found this method unsuitable. In current
> Peri3dController, the strain can be prescribed directly. For prescribed
> stress, the appropriate strain component is estimated so as the stress
> differs minimally from ideal value..
>


>
> good luck in your work wishes
> Jan
>
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