Question #136034 on Yade changed:
https://answers.launchpad.net/yade/+question/136034

Chareyre proposed the following answer:

> I meant: I would like to see a work in which authors also present the 
> calibration analysis in itself (for the non-linear elastic contact >case, for 
> instance), where the influence of the parameters (and their meanings) 
> involved is accessed. Then, of course, different >procedures lead to the same 
> results as long as they do not affect them.

Then read my thesis :-) (thanks Luc for kind aknowledgement!)

> I keep the Young's modulus the same during simulation. When I change
its value I refer to another sample. Actually I realize now that
>perhaps I am not setting the max unbalanced force low enough :-( I see
you mentioned in this post a value for it of 1e-10.

No, don't consider 10e-10 a target value in routine simulations, or you will 
wait forever.
It is only a good test to check that unbF is monotonically decreasing with 
steps in the
asbence of loading fluctuations (and past 10e-10, don't expect further decrease 
because
you reached numerical noise). 10e-3 is a reasonable default threshold in TT in 
my opinion
(but I'm quite liberal on this aspect ;-)).

Cheers.

B.

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