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Re: About the moment calculation in cohesion-friction model


Hi Liqing,

there are actually 2 laws similar to the one you mention. One is
directly based on Jean-Patrick Plassiard's paper,
Law2_SCG_MomentPhys_CohesionlessMomentRotation written by Chia Weng Boon
https://www.yade-dem.org/sphinx/yade.wrapper.html#yade.wrapper.Law2_SCG_MomentPhys_CohesionlessMomentRotation). In that case (http://bazaar.launchpad.net/~yade-dev/yade/trunk/annotate/head%3A/pkg/dem/Engine/GlobalEngine/CohesionlessMomentRotation.cpp#L139) the bending moment is limited as you mention.

The one you used is perhaps Law2_ScGeom_CohFrictPhys_ElasticPlastic
(https://www.yade-dem.org/sphinx/yade.wrapper.html#yade.wrapper.Law2_ScGeom_CohFrictPhys_ElasticPlastic) written by Janek Kozicki; it is much less clear in documentation, but there is no plasticity in the bending sense, see 

Cheers, c+v

> 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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