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Re: [Question #668215]: How to define a material using “Coefficient of rolling elastic limit”?

 

Question #668215 on Yade changed:
https://answers.launchpad.net/yade/+question/668215

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Hi,

Ip2_CohFrictMat_CohFrictMat_CohFrictPhys and
Law2_ScGeom6D_CohFrictPhys_CohesionMoment should be what you want, I
guess.

This law makes a distinction between twisting and bending moments
though, contrary to the above-mentioned paper, it seems (after a quick
look). As such, you have two parameters: CohFrictMat.etaRoll [1] and
CohFrictMat.etaTwist [2] that have a similar meaning than the
"Coefficient of rolling elastic limit" you mention.

It may be still possible to establish some equivalence with Plassiard et
al.'s paper (using maybe CohFrictMat.etaRoll = CohFrictMat.etaTwist =
etaYADE, and "Coefficient of rolling elastic limit" = sqrt ( 2 eta^2) ?
), but I would advice you to dig into the corresponding equations [3] to
be sure about that, or to wait for other answers.

Jérôme

[1] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.CohFrictMat.etaRoll
[2] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.CohFrictMat.etaTwist
[3] https://github.com/yade/trunk/blob/e4e757f2e98a620e3177b7a36a1d10f69f6a6a28/pkg/dem/CohesiveFrictionalContactLaw.cpp

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