# CohesionMoment

Hi,

I'd like to involve cohesion and moment for contacts, and Law2_ScGeom6D_

1. In [1], click on link ''Law2_

2. Refer to ''CohFrictMat.

O.materials.

In [2], it asks to go to ''CohFrictPhys.

3. Refer to ''CohFrictPhys.

I choose false (defalt value) for the purpose of computing moments only for cohesive contacts. However, in ''Law2_

By the way, I also reviewed some papers which worked based on Law2_ScGeom6D_

Could you please give some suggestions?

Many thanks.

Leonard

[2]https:/

[3]https:/

[4]https:/

[5]https:/

## Question information

- Language:
- English Edit question

- Status:
- Solved

- For:
- Yade Edit question

- Assignee:
- No assignee Edit question

- Solved by:
- drasszkusz

- Solved:
- 2019-11-15

- Last query:
- 2019-11-15

- Last reply:
- 2019-11-13

drasszkusz (drasszkusz) said : | #1 |

Hello,

> In [2], it asks to go to ''CohFrictPhys.

Yes, if false, the shear strength is the sum of friction and adhesion.

> 3. Refer to ''CohFrictPhys.

I choose false (defalt value) for the purpose of computing moments only for cohesive contacts. However, in ''Law2_

If false, it computes the rolling and twisting moments (controlled by rolling and twisting resistance/friction coefficents aka etaRoll and etaTwist) in case of active cohesive bonds between particles. This way you can control the movement of the rolling and twisting of particles on/to each other. If it set to true, then it always calculates the moments also if there is no cohesive connection between particles. This way the particle shapes can be considered in numerical way, if the real particles are not perfectly spherical. [1]

>By the way, I also reviewed some papers which worked based on Law2_ScGeom6D_

There are some papers considering both at the same time [2] [3]. In the [3], you can find the mathematical background (equations) which are from the source code.

Daniel

[1] https:/

[2] https:/

[3] page 272-282 https:/

drasszkusz (drasszkusz) said : | #2 |

Sorry, wrong link for [3]. It is page 272-282 at https:/

Leonard (z2521899293) said : | #3 |

Thanks drasszkusz, that solved my question.