Yade

Rolling friction coefficient in Hertz-Mindlin contact law

Asked by Chien-Cheng Hung

Dear all,

I found from the previous question that the rolling resistance is implemented in Hertz-Mindlin contact law [1][2][3].
As far as I know, rolling resistance can be defined by the rolling stiffness (Krot) and the coefficient of rolling friction.
My question is although I found that I can define rolling stiffness by [3], I am not sure how to define the coefficient of rolling friction with what parameter? Is the eta [2] refers to the coefficient of rolling friction?

Thanks!
Chien-Cheng

[1] https://yade-dem.org/doc/yade.wrapper.html?highlight=includemoment#yade.wrapper.Law2_ScGeom_MindlinPhys_Mindlin.includeMoment
[2] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Ip2_FrictMat_FrictMat_MindlinPhys.eta
[3] https://yade-dem.org/doc/yade.wrapper.html?highlight=krot#yade.wrapper.Ip2_FrictMat_FrictMat_MindlinCapillaryPhys.krot

Question information

Language:
English Edit question
Status:
Solved
For:
Yade Edit question
Assignee:
No assignee Edit question
Solved by:
Jérôme Duriez
Solved:
Last query:
Last reply:
Revision history for this message
Best Jérôme Duriez (jduriez) said : 		#1

Hi,

> Is the eta [2] refers to the coefficient of rolling friction?

Yes, that's the parameter which governs maximum torque. For more details, see source code in pkg/dem/HertzMindlin.cpp, eg [*], or hope for other answers.

[*] https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/HertzMindlin.cpp, l. 671 in particular, as for latest YADE version

Revision history for this message
Chien-Cheng Hung (chiencheng) said : 		#2

Thanks Jérôme Duriez, that solved my question.