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[Karol Brzezinski <question706768@xxxxxxxxxxxxxxxxxxxxx>]

Question #706768 on Yade changed:
https://answers.launchpad.net/yade/+question/706768

    Status: Open => Answered

Karol Brzezinski proposed the following answer:
Hi Senel,

In the Cundall-Strack model, the contact stiffness is linear (does not
depend on the contact force or particles' overlap). On the other hand,
the Hertz-Mindlin law is exponential [1], and stiffness increases with
load. In other words - those are different models, so they give
different results.

BTW: Your void ratio definition is very strange. If you achieved Vr = 1
in the experiment (by your definition Vr=volume of particles/volume of
container), you actually had zero porosity. It doesn't look like this in
the simulation, because the particles highly overlap, hence some of the
particle volume is counted twice.


Best wishes,
Karol


[1] https://en.wikipedia.org/wiki/Contact_mechanics

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