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[Chiara Modenese <question169595@xxxxxxxxxxxxxxxxxxxxx>]

Question #169595 on Yade changed:
https://answers.launchpad.net/yade/+question/169595

    Status: Open => Answered

Chiara Modenese proposed the following answer:
Hi Kneib,

I am not the author of the concerned code but, from what I can see, it
computes a normal and shear adhesive forces so you are right that the unit
of measure of normalCohesion is Pa. Generally, the squared of particle
radius is regarded as some crude measure of the contact area between two
contact spheres (I have seen using it in a few papers).

HTH, Chiara


On 30 August 2011 13:50, Kneib François <
question169595@xxxxxxxxxxxxxxxxxxxxx> wrote:

> New question #169595 on Yade:
> https://answers.launchpad.net/yade/+question/169595
>
> Hi all,
>
> I'm just wondering about the Physics unity of the normalCohesion and
> shearCohesion parameters of a cohesive frictional material.
>
> Here is the part of the Ip2_CohFrictMat_CohFrictMat_CohFrictPhys :
>
> contactPhysics->normalAdhesion =
> std::min(sdec1->normalCohesion,sdec2->normalCohesion)*pow(std::min(geom->radius2,
> geom->radius1),2);
> contactPhysics->shearAdhesion =
> std::min(sdec1->shearCohesion,sdec2->shearCohesion)*pow(std::min(geom->radius2,
> geom->radius1),2);
>
> So is it some Pascals ? Why using the area of a square of length=radius ?
>
> Tx
>
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