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[Jerome Duriez <duriez@xxxxxxxxxxxxxxx>]

Thank you for these explanations. I think I see clear now for normal and 
tangential stiffnesses but I see always differences for rolling 
stiffness. In the mentionned paper the rolling stiffness kr (the one of 
"moment" = kr * "angle"), is defined as :
kr = a dimensionless parameter Br which multiplies ks * 
(mean(radii))^2,         (where ks is so the tangential stiffness of Fs 
= ks * Delta(us))

So I see two differences with what is in CohesiveFrictionalRelationships :


- first of all that's not (mean(radii))^2 that appears in Yade but 
product(radii)

- secondly, even in the case of a contact between two bodies with same 
radii (where this last remark vanishes), no parameter (which could be 
the "Br") appears in Yade, except this 2.0 (whereas for example in the 
paper the calibrated value of Br was 0.12)

To finish, but that's maybe less important, in this 
CohesiveFrictionalContactLaw the moment seems to not be limited by a 
plastic threshold. Is there an existing class where it is the case ?

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