Question #699705 on Yade changed:
https://answers.launchpad.net/yade/+question/699705
Status: Open => Answered
Karol Brzezinski proposed the following answer:
Hi,
to be honest I thought so until now. Probably the best way to answer this
question would be to study the source code.
I believe that you can find the answer here:
CPM:
https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/CohesiveFrictionalContactLaw.cpp#L307
Hertz-Mindlin:
https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/HertzMindlin.cpp#L67
https://gitlab.com/yade-dev/trunk/-/blob/master/pkg/dem/HertzMindlin.cpp#L535
It looks like CPM uses dimensionless rolling stiffness as you stated,
but the Hertz-Mindlin model only takes 'krot' that is not related to
other stiffness parameters, and then computes moment directly based krot
and relative rotation.
Best wishes,
Karol
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