# How to set coefficient of rolling friction

Hello,

According to Rodaina Aboul Hosn(2017)[1],we can introduce rolling resistance by the rolling stiffness and coefficient of rolling friction.According [2],I use Law2_ScGeom6D_

In addition, rolling stiffnesses are proportional to the shear stiffness through dimensionless factors alphaKr[3]. I think the shear stiffness is calculated using Young's modulus,right?

Thanks for your any suggestion.

[1]https:/

[2]https:/

[3]https:/

## Question information

- Language:
- English Edit question

- Status:
- Solved

- For:
- Yade Edit question

- Assignee:
- No assignee Edit question

- Solved by:
- Luc Sibille

- Solved:
- 2019-10-21

- Last query:
- 2019-10-21

- Last reply:
- 2019-10-21

Luc Sibille (luc-sibille) said : | #1 |

Hello,

Here is the rolling friction coefficient:

etaRoll

Yes the shear stiffness is calculated using the parameter

young

which actually not a Young modulus, but a stiffness modulus of the

particles.

Finally you can find a new paper about theses questions in the

continuity of the one from Aboul Hosn et al, here [1]

Best,

Luc

[1] https:/

or

https:/

Le 21/10/2019 à 14:17, Chu a écrit :

> New question #685303 on Yade:

> https:/

>

> Hello,

> According to Rodaina Aboul Hosn(2017)[1],we can introduce rolling resistance by the rolling stiffness and coefficient of rolling friction.According [2],I use Law2_ScGeom6D_

>

> In addition, rolling stiffnesses are proportional to the shear stiffness through dimensionless factors alphaKr[3]. I think the shear stiffness is calculated using Young's modulus,right?

>

> Thanks for your any suggestion.

>

> [1]https:/

> [2]https:/

> [3]https:/

>

--

Luc Sibille

Université Grenoble Alpes / IUT1 de Grenoble

Laboratoire 3SR: Sols, Solides, Structures, Risques

Tel lab.: +33 (0)4 76 82 63 48

Tel IUT: +33 (0)4 76 82 53 36

Hi,

Rolling friction is listed just a couple lines below [3].

> I think the shear stiffness is calculated using Young's modulus,right?

Yes. Overall there is only one dimensional stiffness (Young), used to define normal stiffness, the others are defined relatively, by a set of dimensionless coefficients.

Bruno

Chu (arcoubuntu) said : | #3 |

Thanks Luc Sibille, that solved my question.

Chu (arcoubuntu) said : | #4 |

Thanks Bruno, that solved my question.

manisharma (manisharma11211) said : | #5 |

Thanks for this information. It useful