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Re: General questions


> For me ("advantage" depends on your goals), the main advantage was to 
> get a constant ratio between local stiffness parameters and stiffness of 
> the packing. Changing particles sizes will not affect this ratio. If you 
> like non-dimensional problems, you should like this.
> Another advantage is, the Y. modulus of the dense packing will be of the 
> same order of magnitude as the modulus you give in the beginnng. You 
> have an a-priori estimate.
> For Poisson, the name is only due to the fact that Poisson's ratio 
> depends mostly on ks/kn. But there is no constant - not even linear - 
> relation between the micro and the macro in that case.
There is if spheres have constant radii (ν=(1-kt/kn)/(4+kt/kn)). For
Young, macro modulus is proportional to (1-2ν)kn, depending on packing
density. (not yet published)
> Last bzr snapshot is probably the best option. It will be totaly stable 
> as long as you don't update it. ;)
> The best is to try and update frequently however, always keep backups of 
> working code before any update. In the worst case (i.e. you realize 
> after a few weeks that you spent more time solving conflicts, filling 
> bug reports, or negotiating changes in somebody else's code, than 
> actually writing your law), you can always resume working offline.
As long as you work on your own piece of code, you will typically have
no interference with others.

Cheers, v.

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