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[Jan Stránský <question227410@xxxxxxxxxxxxxxxxxxxxx>]

Question #227410 on Yade changed:
https://answers.launchpad.net/yade/+question/227410

    Status: Open => Answered

Jan Stránský proposed the following answer:
Hello,

either you can find this information in the source code, or you can ask
here for the specific Ip2 functor (as you mentioned, each one may implement
its own approach). For the two examples you gave:
Ip2_CpmMat_CpmMat_CpmPhys: avg( tan(frictionAngle) ) is considered
Ip2_FrictMat_FrictMat_FrictPhys: min( frictAngle ) is considered

see also https://answers.launchpad.net/yade/+question/225776

cheers
Jan



2013/4/25 liucheng83 <question227410@xxxxxxxxxxxxxxxxxxxxx>

> New question #227410 on Yade:
> https://answers.launchpad.net/yade/+question/227410
>
> Hello,
> How to determine the internal friction angle between bodies? Like between
> two spheres, or sphere and facet?
> Is it true that interal_fri=min(fri1,fri2) except for
>  Ip2_CpmMat_CpmMat_CpmPhys
>
> Here is "6.2.2 Other parameters" in page 126 in yade--0.95.pdf
> -----
> Other parameters
> Non-elastic parameters differ for various material models. Usually,
> though, they are averaged from the particles’ material properties, if it
> makes sense. For instance, Ip2_CpmMat_CpmMat_CpmPhys averages most
> quantities, while Ip2_FrictMat_FrictMat_FrictPhys computes internal
> friction angle as  to avoid friction with bodies that are frictionless.
> ----------
>
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