yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

> I think just 6 goals will do, since shear stresses will be (in
> equilibirum) symmetric.
>
>   
Mmmmh... It is restricting possible loading scenarii, since F is not 
symmetric (imagine somebody wants to assign all 9 components of F).

> I actually wanted to have one big system (matrix) and then eliminate
> columns corresponding to given goals (which would move to RHS) etc, but
> that will need incremental formulation, and a few thoughts how to handle
> absolute goals in that case...
>   
I'm not really sure it is possible to solve this problem. We have 
path-dependent and rate-dependent problems, we can't just define the 
absolute goals (F/stress) and let Yade decide what the path will be (for 
loading rate, I think your approach using maxRate is perfect). For 
complex loadings, the user has to define the loading path, I see no 
other option. The simulation can still be stopped based on "goal" values 
of F, but if goals are not consistent with the loading direction, it 
will never end (user's responsability).

>   
> > This is why I implemented cell inertia. Did you fix this or it was not 
> > really a problem?
> >     
> I didn't fix it, but inertia has nothing to do (?) with material
> stiffness? It is just "dynamic" stiffness.
>
>   
They are two different ways to apply the goal stress. I thought 
stiffness was broken (is it or not?), that is why I used the inertial way.

Bruno

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