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Re: [Question #698594]: Triaxial test comparison between periodic boundary and rigid boundary


Question #698594 on Yade changed:

    Status: Needs information => Answered

Luc Sibille proposed the following answer:
Hello Leonard,

When you say "same initial void ratio", does "initial" mean just before 
the triaxial compression?
Similarly did you check the coordination number just before the triaxial 
compression is the same for the two cases?


Le 01/09/2021 à 18:35, Leonard a écrit :
> New question #698594 on Yade:
> https://answers.launchpad.net/yade/+question/698594
> Hi,
> I carried out triaxial compression tests at two boundary conditions (one case with rigid wall and one case with periodic boundary), the two cases use the same material, the same particle size distribution and paticle number, same contact law and the same initial void ratio, at same confining pressure, same strain rate (I think), and almost the same of sample size. But I got really different mechanical response, especially for the volumetric behaviour, the periodic one shows contractive behaviour, while the rigid case shows dilative behaviour. I thoungh I have controlled all the conditions (except boundary condition) the same.
> It is not surprise that there are some difference, but is it normal to have such a big difference?  Or did I miss some factors which can also lead to the difference?
> Thanks!
> Leonard

Luc Sibille
Université Grenoble Alpes / IUT1 de Grenoble
Laboratoire 3SR: Sols, Solides, Structures, Risques

Tel lab.: +33 (0)4 76 82 63 48
Tel IUT: +33 (0)4 76 82 53 36

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