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[Jan Stránský <question403169@xxxxxxxxxxxxxxxxxxxxx>]

Question #403169 on Yade changed:
https://answers.launchpad.net/yade/+question/403169

Jan Stránský proposed the following answer:
Hello,

a few comments:
- periodic boundary conditions are not very good for compression, as the
failure mode would not be periodic (unlike in the case of tension)
- the material model exhibits fracture of interactions of fixed size, so if
you change specimen size, you can get different stress-strain diagrams
(especially in the post-peak range)
- you preserve strain rate, but the size differs and therefore absolute
velocities and their differences also differ between different sizes. Try
to inrease nSteps to see what happens (I guess for the same size and
different nSteps you get different results)
- see Jerome's answer, the number of spheres should be large enough. What
numbers of particles did you try and still the results were "dramatically
altered"?
- are you sure your stressMask and goal in Peri3dController are what you
want?

So there a few possible reasons :-)

cheers
Jan


2016-10-19 17:37 GMT+02:00 Jérôme Duriez <
question403169@xxxxxxxxxxxxxxxxxxxxx>:

> Question #403169 on Yade changed:
> https://answers.launchpad.net/yade/+question/403169
>
> Jérôme Duriez proposed the following answer:
> Hello,
>
> A number of 10000 - 20000 particles is classical and appropriate for REV
> simulations (of triaxial tests, for instance) with usual (non-periodic)
> boundaries
>
> If you use such number in periodic boundaries, I think you can be sure
> you have enough particles.
>
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