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[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

I must correct my previous definition of CC.

It is better to define :

           sum(|SFi|)  (sum of the norms of resutant forces on bodies)
CC =    ___________
            **sum(|Fi|)**    (sum of the norms of contact forces)

In my previous definition, CC was proportional to the number of bodies 
because the denominator was mean(|Fi|).

Sorry...

Bruno

> Simply compute the sum of all forces on a body. At equilibrium, sum of all Fi on body Bk is 0. If you sum now on all bodies, you still have 
> sum of F over all i and k equal to 0 (SFik = 0).
> If SFik != 0, you are not at equilibrium.
> If you normalize SFik dividing it by the mean value of F, you have the classical definition of CC.
>
> Bruno
>
>
> _______________
> Chareyre Bruno
>      Maître de conférence
>      Institut National Polytechnique de Grenoble
>      Tél : 04.56.52.86.21
>      ________________________________________      
>      bureau I 08
>      Laboratoire 3S (Soils Solids Structures) 
>      BP 53 - 38041, Grenoble cedex 9 - France 
> _______________
>  


--
_______________
Chareyre Bruno
     Maître de conférence
     Institut National Polytechnique de Grenoble
     Tél : 04.56.52.86.21
     ________________________________________      
     bureau I 08
     Laboratoire 3S (Soils Solids Structures) 
     BP 53 - 38041, Grenoble cedex 9 - France 
_______________