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[Chiara Modenese <question199704@xxxxxxxxxxxxxxxxxxxxx>]

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

Chiara Modenese proposed the following answer:
OK, then you mean the tangential stiffnesses. I thought you referred to some equivalent constant value.
Thanks for reply,
Chiara

On 23 Jun 2012, at 14:45, ceguo wrote:

> 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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