yade-users team mailing list archive

[Luc Sibille <luc.sibille@xxxxxxxxxxxxxx>]

Václav Šmilauer a écrit :
> > 1) Is it possible to have a hertz mindlin contact law instead of a
> > hooke's contact law between granular particles?
>
> If you mean the law described e.g. in 
> http://geology.msu.edu/pdf/Poisons_S_vel.pdf (2), it means computing
> contact stiffnesses from bodies' rigidities differently and updating
> them based on the (varying) confining force. Quite easy to do, and
> certainly a welcome addition to yade (we are here to help you with
> that).
>
> > 2) Is it possible to compact an assembly under a prescribed
> > anisotropic stress state?
>
> There is ThreeDTriaxialEngine by Luc Sibille; Bruno/Luc will tell you
> how to use it.

As said Vaclav, you can use the ThreeDTriaxialEngine for that.
With the ThreeDTriaxialEngine you can choose for each of the three space 
directions a control in strain or in stress. Thus, with respect to your 
question about an anisotropic stress state you can prescribe for 
instance a full control in stress to load the granular assembly from 
sigma_1 = sigma_2 = sigma_3 = 0 to sigma_1 = 100 kPa, sigma_2 = 75 kPa 
and sigma_3 = 250 kPa.

> > 3) Is it possible to grow the size of a particle gradually?
>
> TriaxialTest can use particle growth for compaction, you can certainly
> do the same.

You can have a look at the particle growth implemented in the 
"TriaxialCompressionEngine" and mainly in the engine 
"TriaxialStressController", it works very well.

Luc

> V.
>
>
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--
Luc Sibille

Université de Nantes - Laboratoire GeM UMR CNRS

IUT de Saint Nazaire
58, rue Michel-Ange - BP 420
44606 Saint-Nazaire Cedex, France

Tel: +33 (0)2 40 17 81 78