New question #208965 on Yade:
https://answers.launchpad.net/yade/+question/208965
Many body here seems interested in the rolling moment type model for granular
media, including me.
however, as I have read some of the talking in this launchpad, I am not
satisfied with the answers and also I have never realized
one modeling using rolling model.
As I know, at least 2 model could be used for modeling rolling resistance
1) Ip2_CohFrictMat_CohFrictMat_CohFrictPhys() +
Law2_Scgeom6D_cohFrictPhys_cohFrictPhys_CohesionMoment()
which can model compression shear rolling and twisting, but I have tested
that as linran(one of the yade user) did, in one of the interactions, I found
bending moment and twisting moment are both 0.
As for this contact law, anybody have tested it, and how to use this one to
model rolling resistance?
2) Ip2_FrictMat_FrictMat_MindlinPhys() + Law2_ScGeom_MindlinPhys_Mindlin()
as talked by Christian Jacob last time by add parameters in this contact
law krot eta and includeMoment=True
I have also tested this scheme, rolling moment could be added , the problem
is the maxmum rolling moment is larger than the plastic bending moment if I set
eta=1.0, I guess eta plays no role here. Have Jacob tested eta?
Also I have questions about the 2nd way, if I have set krot and eta, the
initial state (after isotropic compression) is really difficult to control, at
least kn ks frictionangle krot and eta should be tested. however, In
Plassizrd's paper used SDEC, he just used kn ks and frictionangle to control
the isotropic compression process, and then add rolling moment to the contact,
but I never realized that in yade, which I have found only friction angle could
be easily changed.
Anybody have realized the rolling moment model in yade using either the
method I mentioned or other scheme?
I am glad to talk with all of u interested in rolling resistance moment model
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