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[Chiara Modenese <question191800@xxxxxxxxxxxxxxxxxxxxx>]

Question #191800 on Yade changed:
https://answers.launchpad.net/yade/+question/191800

Chiara Modenese proposed the following answer:
On 27/03/12 13:35, Chareyre wrote:
> Question #191800 on Yade changed:
> https://answers.launchpad.net/yade/+question/191800
>
> Chareyre proposed the following answer:
> Of course, stiffness is a physical parameter and changing it may affect
> (or not...) the results. Ultimately the number of particle is the only
> parameter you can play with.
I agree. I would also suggest to wangxiaoliang to always check that the 
results are not affected by the change in stiffness or any other 
physical parameters.
> However, if wangxiaoliang is targeting a final strain of 0.3, he is probably not focusing on the elastic regime.
> If the confining pressure is small compared to the stiffness of silicates (10e11), stiffness can most likely be decreased by a few orders of magnitude without any change in peak strength, residual strength, dilatancy, etc. It's all a matter of modelling methodology and wise compromize. The best model is useless if it can't be computed...
Correct... But then wangxiaoliang (btw, is this your name?) should 
reconsider the use of Hertzian law. The sensitivity with this law is 
high to the stiffness level, in terms of strains (small and large), 
dilatancy, peak strength etc. If you are interested, there is some nice 
published work by C. Thornton where the behaviour of soft and hard 
spheres (Hertzian type) is compared and discussed (700MPa versus 70GPa 
of Young's modulus).

Cheers,
Chiara

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