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Re: About the moment calculation in cohesion-friction model
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.
On 16/09/10 12:40, ?????? wrote:
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.
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