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Re: Some questions


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

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.



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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