Hello Bruno,
I am sorry to tell you maybe there are some problems if the rolling
resistance is considered in Law2_ScGeom_CohFrictPhys_ElasticPlastic.
Yade give the error and stop the calculation. I thought maybe it is
derived from the velositybins. But, I still cannot get the force value
even if I deleted the all parameters in InsertionSortCollider.
The mentioned error is described as follow:
55217 FATAL yade.VelocityBins
/home/jiaoliqing/yade/pkg/common/DataClass/VelocityBins.cpp:77
setBins: Body #12179, velSq=-nan not put in any bin!?
Aborted
Could you help me to check it? Thank you so much.
Best
Liqing
At 2010-09-19 11:45:02，"焦利青" <jiaoliqing@xxxxxxx> wrote:
Hello Bruno,
Thank you for your so warm help. According to your reply, I think
I can understand this law totally. Thank you again.
I think you said is reasonable. But, now I am confused at which
law is suitable for my model, instead I haven't confused at the
law itself. I just want to simulate the almost perfect
elastic-plastic material. Compared to CohesiveFrictionalPM, wether
this law is better? The different moment threshold criteria should
play the varied effect. However, how much effect on the model?
Maybe the one law is suitable to the one kind of material, and the
other laws are suitable to the others. If you have no idea, I will
try. According to the deformed shape and the stress-strain curve,
the suitable law will be chosen. If you have any comment, please
don't hesitate to let me know. Thank you.
if necessary, I will make the change in source, then I will
discuss it in here. Thank you. :)
Best
Liqing
At 2010-09-18 01:29:03，"Bruno Chareyre"
<bruno.chareyre@xxxxxxxxxxx <mailto:bruno.chareyre@xxxxxxxxxxx>>
wrote:
Hello Liqing,
You are right on the fact that there is no plastic limit for
moment in current law. The calculation of moment itself
however (say, elastic rotation-moment law) should be the same
as in Plassiard et al., only the threshold is missing.
Moment will not exactly act all the time, it will act as long
as shear or tensile strength are not exceeded, then the
contact is broken and there is no moment anymore.
It would be nice to implement the plastic limit on moment.
Feel free to do that (maybe using CohesiveFrictionalPM as an
exemple, or maybe you will use this one straight away?) and
ping us for integrating the change in the sources.
Making the default threshold "infinite" will not change the
default behaviour and cannot hurt anybody.
Cheers.
Bruno
On 16/09/10 12:40, 焦利青 wrote:
Hello,
I found the moment calculation in cohesion-friction model is
different from the traditional algorithm which is listed in
the paper(Jean-Patrick Plassiard etl, A spherical discrete
element model:calibration procedure and incremental response,
209; N. Belheine etl, Numerial simulation of drained triaxial
test using 3d discrete element modeling; Rolling resistance
at contacts in simulation of shear band development by DEM).
In the traditional algorithms, the slider for rolling starts
working if the moment exceeds a value of "eta* Normal force".
However, I cannot find the related code described it. If no
any condition to relax the moment. then the moment will act
all the time. I think it should be wrong. Maybe I haven't
found the right file. May I have your help? Thank you.
Best
Liqing
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ENSE³ - Grenoble INP
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Tél : +33 4 56 52 86 21
Fax : +33 4 76 82 70 43
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