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[Chiara Modenese <question136704@xxxxxxxxxxxxxxxxxxxxx>]

Question #136704 on Yade changed:
https://answers.launchpad.net/yade/+question/136704

    Status: Answered => Open

Chiara Modenese is still having a problem:
Hi Bruno,
thanks for answer. I was wondering if permitting a higher rate could not be
problematic. I mean, I see the need for such a limitation. However, I am not
sure whether the factor of 10 you propose is always enough or perhaps too
restrictive in some cases. In the end everything seems to require
calibration :-(
Btw, looking at the code, strain_rate does seems to be constantly applied
even if the control is of strain type (line 201?).
cheers. Chiara


On 5 December 2010 20:10, Chareyre
<question136704@xxxxxxxxxxxxxxxxxxxxx>wrote:

> Your question #136704 on Yade changed:
> https://answers.launchpad.net/yade/+question/136704
>
>     Status: Open => Answered
>
> Chareyre proposed the following answer:
> Hi Chiara,
>
> You can't apply a strain rate directly, so you define a target strain and a
> max strainRate, and it will load at this rate on direction k, as soon as k
> is not stress-controlled.
> This is how I set periTriax for a constant strain rate loading in direction
> 1, and constant stress on 0 and 2 (a few revisions ago, but I don't think it
> changed) :
>
> triax.goal=[-1e4,triax.strain[1]-finalStrain,-1e4]
> triax.maxStrainRate=[rate*10.0,rate,rate*10.0]
> triax.stressMask=5
>
> In goals "triax.strain[1]-finalStrain" means final strain with reference to
> current state.
> Higher rates are allowed for axis 0 and 2, so that its not a limiting
> factor for stress regulation (maxima apply for all boundaries).
> stressMask=5 set which  directions are stress controled with bit mask
> (True*1+False*2+True*4).
>
> I hope it helps.
>
> Bruno
>
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