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Re: [Question #697550]: Coefficient of friction between two different materials
Question #697550 on Yade changed:
Status: Open => Answered
Jan Stránský proposed the following answer:
> I am new to DEM simulations
> which values does yade take
generally speaking, it may be different for different materials,
different contact laws etc.
- Material (e.g. FrictMat) stores properties of material = material properties of particle
- IPhys stores properties of interaction = material properties of interaction
- Ip2 defines, how IPhys properties are computed from Material
See  for more information.
Note that "material properties of particle" and "material properties of interaction" may be (usually are not, but may be) very different things.
E.g. for FrictMat and FrictPhys:
- FrictMat has frictionAngle property
- FrictPhys has tangensOfFrictionAngle property
- Ip2_FrictMat_FrictMat_FrictPhys has frictAngle property
For the case of FrictMat and Ip2_FrictMat_FrictMat_FrictPhys, by default
Ip2_FrictMat_FrictMat_FrictPhys() # no arguments
takes a minimum value of the two friction angles.
However, you can define a MatchMaker  to fit your needs and e.g. take average or maximum value:
Ip2_FrictMat_FrictMat_FrictPhys( frictAngle=MatchMaker(...) )
To get this information, you can:
- read documentation 
- build a simple scene (1 sphere, 1 wall, 1 predefined contact) and test yourself
- ask a question here
- read source code 
Roughly ordered by preference, but it may differ.
E.g. for beginners, it is ok to ask very basic things here before they learn how to use and search documentation.
Advanced users / developers may prefer reading source code.
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