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[Question #227410]: Internal friction angle between bodies?

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From: liucheng83 <question227410@xxxxxxxxxxxxxxxxxxxxx>
Date: Thu, 25 Apr 2013 02:01:30 -0000
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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  
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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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