yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

Hi Chiara,

You said once that you were using updateShear=true. It was actually the 
only reason to keep shear and updateShear in this WT* 2365 commit. ;-)
If it no longer applies, I'll remove this, in order to make ScGeom 
contains the bare minimum.
If somebody need it again, he can derive an Ig containing shear, and 
update it with ScGeom::rotate(shear), as you say. He can also use 
Dem3Dof and get the total shear value from it.

Bruno


> On 15 July 2010 21:00, chiara modenese <c.modenese@xxxxxxxxx 
> <mailto:c.modenese@xxxxxxxxx>> wrote:
>
>     This is because ScGeom algorithms don't need total strain (*). (*)
>     One exception : HertzMindlin, thats why I suggested deriving it
>     from Dem3Dof rather than ScGeom.
>
>     Hi guys, perhaps I am escaping something. Why would HM need total
>     strain? As it is now it is incremental, same way as computed in PFC.
>     Anyway, PFC or not I have been studying Mindlin's paper and I plan
>     to code the exact formulation in the future. And again it is all
>     incremental. So no problem on my side with the current design.
>
>
> One more note. Even if ScGeom is using the incremental formulation, it 
> is always possible to calculate the total shear elastic, and 
> eventually also plastic, displacement. It can be done, incrementally, 
> in Law2 if needed. Same way we get the shear force. What is the 
> problem with that?
>
> Chiara
>
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