yade-users team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

This 4k is only for the simple 1D case illustrated by figures. And if 
you look at the corresponding figure, it is in fact one mass with two 
springs (like one sphere with two contacts). So, the term coming from 
one contact is really 2k, wich gives the sqrt(2).

Bruno

> In fact there is no sqrt(2) factor in PFC manual if we consider the 
> MDOF system. They take an equivalent system where the stiffness is 
> equal to 4k being k the stiffness of each spring. At the end there is 
> no sqrt(2) factor in the computation of the time step.
>
> Chiara
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Bruno Chareyre
Associate Professor
Grenoble INP
Lab. 3SR
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