Question #291781 on Yade changed:
https://answers.launchpad.net/yade/+question/291781
Status: Open => Answered
mohsen proposed the following answer:
In the name of god
Hi Geo
> 1)When the confining pressure 10KPa is added, the particles in the packing
> decrease. Maybe the packing has exploded?
This could be True. by increasing E, stiffness would be larger and leads to
lower critical time step (see [1] equation 13). and because of this by
decreasing dt the simulation continues!
>The specimen is compacted and the particles doesn't disappear. It is
defective that the unbalanced force can't <0.01, >increasing the damping
is no use. I increase the max unbalanced force to 0.03, the script can
just continue. But when I >load the deviatoric stress by controlling
strain rate=-0.02, the axial stress is decreasing gradually from 0.8MPa
even to >0.4MPa.(The confining pressure is 0.8MPa.) And when deviatoric
loading, I can see the obviously moving of the particles.
That is right. when you increase stability threshold (from 0.01 to 0.03), in
the beginning of loading phase, there would be a decrease in dedicator stress.
if you wait after several iterations (depending on your simulation may be from
order of 1000) again dedicator stress increases. Therefore:
1- try do your simulation with max unbalanced force=0.01. may this takes along
to get 0.01but finally it would reach it
2- max unbalanced force depends on your material, number and shape of
particles, ... .
[1]: https://yade-dem.org/doc/formulation.html
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