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Re: (no subject)


Hi Nejib,

In the TriaxialCompressionEngine, I think there is a booleen that you can swith from 1 to 0 to stop the computation when the compaction is finished. I don't remember the name of the booleen, but it should be something like "AutoCompressionActivation".

About the stress deviator q: generally speaking, during the compaction phase Yade tries to reach the same stress value for the three space direction. During the compaction, sigma_1, sigma_2 et sigma_3 may be a little bit different, thus you can compute a non vanishing q value (negative or positive), but q value should be very small (and it is not really a problem).
Does it solve your problem?


nejib hadda a écrit :
I don't see how to seperate these two phases on yade.
In fact what I want to do is to compact my specimen before launching the
calculus so that I get the density I wish to have.
But here, yade do both phases simultaniously, and the phase at which q
takes negatives values is the phase of compaction which corresponds to
the first ietrations.

Le mardi 08 décembre 2009 à 17:55 +0100, Luc Sibille a écrit :
For which phase have you got negative q values? The compaction phase, the deviatoric phase, ... ?

Hadda Nejib a écrit :
I don’t know if it is common in YADE to have negative values for the deviatoric stress q in both triaxial test and triaxial test water for the first iterations (numerical problem) until the specimen is stabilized. I have also always had this sudden fall in the value of sigma22 after some iterations at the beginning of my simulations.

Shall I take the initial value of sigmaisocompactation near to value of the confining pressure to avoid such problem ?


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Luc Sibille

Université de Nantes - Laboratoire GeM UMR CNRS

IUT de Saint Nazaire
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