New question #689015 on Yade:
https://answers.launchpad.net/yade/+question/689015

I have read in many journal papers using YADE [1] that kn = E*(Ra*Rb)/(Ra+Rb). 
However, when I use YADE and calculate kn, I get kn = 2*E*(Ra*Rb)/(Ra+Rb). I 
also read [2] and I did not see where the 2 is coming from. Can you help me 
identify it?

Thanks!

[1] A DEM model for soft and hard rocks: Role of grain interlocking on strength
[2] https://yade-dem.org/doc/formulation.html#kinematic-variables

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