New question #234879 on Yade:
https://answers.launchpad.net/yade/+question/234879
Dear Bruno Chareyre and all users:
Thanks for giving me such help last time about the rolling resistence in
YADE, I have known from your suggestions that there is nothing different
Fundamentally about the rolling resistence algorithm in YADE from that Cundall,
Oda & Iwashita mentioned in their papers and in YADE, if the constant relative
rolling coefficient is determined, the relative rolling moment may increase
linearly with the relative rolling angle's increasing. But as I know from some
other papers, this basic method can just only be considered as a roughness way
for concerning the rolling effects for that there is little mechanism
validation for providing the standard of relative rolling coefficient
determination. It is my work to do that write my own codes in YADE for giving
some new models for concerning rolling resistence but not now because my tasks
of mechanism validation by experiments are not finished now. Today my questions
are just about the structure configure of consolidation in my 2D simulation
with clumps.
The ciumps generation at the beginning of my simulation can be finished
sucessfully and the state can be shown as:
(1). http://i.imgur.com/KI0cPLv.png
(2). http://i.imgur.com/fOoecpf.png
And I have employed these commands for starting the consolidation, which can be
described as :
###############################################################################
triax01=TriaxialStressController(
wall_bottom_id=wallids[2],wall_top_id=wallids[3],
wall_left_id=wallids[0],wall_right_id=wallids[1],
wall_back_id=wallids[4],wall_front_id=wallids[5],
wall_front_activated = False,wall_back_activated = False,
internalCompaction=False,
stressMask=7,
goal1=10000,
goal2=10000,
goal3=10000,
max_vel=2,
)
#############################################################################
After the consolidation finishing, the structure configure is just like that
http://i.imgur.com/tv24Ymu.png
The length versus width of this specimen is 2:1 but that is much more than that
value after consolidation finishing. I can find
nothing wrong in my script but this state is much different from that of the
experiments. Please tells me why and how can I do for getting a correct state
of consolidation.
Extension of my points above, as my understanding of biaxial compression test,
the most important purpose of consolidation is to get the target volume of
specimen ( in DEM, porosity can be used for defination this target
volume when the initial size of specimen is known ). It is obviously noticed
in accordance with the relationship between
confining pressure and volume change that the final volume of specimen can be
determined by just only one confining pressure when the material properties
are known. So it is very difficult to predetermine the confining pressure for
prviding this target volume before the consolidation starting. That is no need
for experiments but necessary for DEM. It is just like my codes above, I can
not ensure that 10000pa confining pressure can sucessfully give the very volume
of this specimen.
Please tell me how to solve my problems. Seeking for your help!
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