yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

I'm not sure I understand completely.
First reaction :
Why not change "goal" with time, in comp=M*goal? It would give a strain 
rate.

Second :
It could be simpler to prescribe strainrates/stresses.

Another point : concerning the displacement field. I think we move 
particles on the edge first currently (right?), a matrix could be used 
to move all particles with respect to the deformation of the period (I'm 
sure you remember discussions about this). Feel free to list precisely 
what is needed for this, I can try and help coding it.

Bruno




Václav Šmilauer a écrit :
> Hi (Bruno),
>
> I wrote yesterday PeriTriaxController. I have in mind some more precise
> control using a Matrix3 that would relate 3 goal numbers to prescribed
> strain/stresses; a system of linear equations, if you like.
>
> For instance: goal=(1e6,0,0.1), computed variables comp=(σx,σy,εz), i.e.
> stressMask=3 (first 2 components are stress, the last one is not)) and
> the matrix
>
> 1  0 0 
> 1 -1 0
> 0  0 1
>
> then the system comp=M*goal gives
>
> σx=1e6
> σy=σx
> εz=0.1.
>
> I am wondering if you have an idea to extend this to include strain
> rates as well (it is not independent)
>
> (BTW don't look at the stiffness computation there, it is wrong, I know;
> the average stress is right, though)
>
>
>
>
>
>
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