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[ceguo <question199704@xxxxxxxxxxxxxxxxxxxxx>]

Question #199704 on Yade changed:
https://answers.launchpad.net/yade/+question/199704

ceguo posted a new comment:
Hi Chiara,

Thanks for the reply. The equivalent stiffness is defined as K=dF/dU,
where dF is change of contact force and dU is change of overlap or
sliding displacement. So e.g. in Hertzian model, equivalent K_n, K_s are
(from PFC mannual):

K_n = (2G sqrt(2R)/(3(1-nu)))sqrt(U_n);

K_s = (2(G^2*3*(1-nu)R)^1/3/(2-nu))*F_n^1/3.

So they are not constant but depend on the current overlap and sliding
condition.

Ning

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