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


New question #698594 on Yade:

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?


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