Hi,
during the triaxial test I should maintain the same lateral stress value
during the analysis, while the axial stress is increasing. The fact is that
from my simulation actually I see from the results that the lateral stress is
not kept constant, but it is increasing. How can I fix it? Am I wrong
somewhere?
Thanks a lot.
Nejib, I can confirm that with the boolean
autoCompressionActivation at the false value you stop the simulation right
after the isotropic compression phase.
Chiara
----Messaggio
originale----
Da: luc.sibille@xxxxxxxxxxxxxx
Data: 10/12/2009 14.17
A: <yade-
users@xxxxxxxxxxxxxxxxxxx>
Ogg: Re: [Yade-users] (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?
Luc
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
58, rue Michel-Ange
- BP 420
44606 Saint-Nazaire Cedex, France
Tel: +33 (0)2 40 17 81 78
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