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[Chiara Modenese <question199585@xxxxxxxxxxxxxxxxxxxxx>]

Question #199585 on Yade changed:
https://answers.launchpad.net/yade/+question/199585

Chiara Modenese proposed the following answer:
Hi Jacob,

As for point 1:
I introduced the rolling friction in HM Law some time ago. Please have a look at the documentation, in particular at:
https://yade-dem.org/doc/yade.wrapper.html?highlight=includemoment#yade.wrapper.Law2_ScGeom_MindlinPhys_Mindlin.includeMoment
https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Ip2_FrictMat_FrictMat_MindlinPhys.eta
https://yade-dem.org/doc/yade.wrapper.html?highlight=krot#yade.wrapper.Ip2_FrictMat_FrictMat_MindlinCapillaryPhys.krot

@Luc: It is not about combining two contact laws but everything can be
dealt with inside one contact model (resistance to rolling is a separate
additional feature, in fact).

As for point 2:
It is entirely up to the calibration procedure.

Chiara


-- 
Chiara Modenese, BSc MSc
DPhil(PhD) Candidate in Engineering Science
Department of Engineering Science
Parks Road, Oxford, OX1 3PJ, UK
email: chiara.modenese@xxxxxxxxxxxx
website: http://www.eng.ox.ac.uk/derg/people/chiara-modenese-1



On 6 Jun 2012, at 14:11, Christian Jakob wrote:

> New question #199585 on Yade:
> https://answers.launchpad.net/yade/+question/199585
> 
> Hi,
> 
> I want to model a sand with Hertz-Mindlin-Contact law and rolling friction.
> 
> 1. Is it possible to do so in yade and if yes, how?
> 
> I tried to combine a material with rolling stiffness and hertz model:
> 
> ...
> #define material:
> id_SphereMat=O.materials.append(CohFrictMat(young=young_modulus,poisson=poisson_ratio,density=rho_p,frictionAngle=angle,alphaKr=roll_stiff))
> ...
> 	InteractionLoop(
> 		...
> 		[Ip2_FrictMat_FrictMat_MindlinCapillaryPhys()],
> 		[Law2_ScGeom_MindlinPhys_Mindlin()]
> 		),
> ...
> 
> but this seems to have no effect on behavior of the particles.
> 
> 2. What would be a good value for lets say a well rounded sand? Has anyone experience with rolling stiffness?
> 
> Thanks in advance,
> 
> Christian
> 
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