Question #187798 on Yade changed:
https://answers.launchpad.net/yade/+question/187798
Status: Open => Answered
Jan Stránský proposed the following answer:
Hi Ning,
the formula used is exactly the same (actually the same function is
called). The difference could be because of different type of
stressTensorOfPeriodicCell() and Peri3dController.stress. The first one
returns a tensor stress=Matrix3(sxx,sxy,sxz, syx,syy,syz, szx,szy,szz),
while the second one is in "vectorized" (Voigt's) notation
stess=Vector6(sxx,syy,szz, syz,szx,sxy). Is this the source of the
difference?
Jan
ceguo píše v St 15. 02. 2012 v 02:50 +0000:
> New question #187798 on Yade:
> https://answers.launchpad.net/yade/+question/187798
>
> Hi,
>
> I am playing with Peri3dController with label e.g. 'biax', but I find the
> stress returned by biax.stress is different from that by calling
> utils.stressTensorOfPeriodicCell(). The formula used by
> stressTensorOfPeriodicCell is what we commonly adopt in DEM. How stress is
> calculated in Peri3dController?
>
> Ning
>
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