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[Sayeed Ahammad <sayeed.ce00@xxxxxxxxx>]

Dear all,
In the YADE code the normal contact stiffness is defined as
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Real Kn = 2*Ea*Da*Eb*Db/(Ea*Da+Eb*Db);
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What is E? Is it stiffness of particle or young's modulus of particle. 

I did not get the theoretical derivation of this expression...
Could you tell me where I will get the exact reference.
Thank you.

Md. Abu Sayeed Soil Mechanics Laboratory,Saitama University, Japan+818036909189