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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
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.
>Data: 10/12/2009 14.17
>Ogg: Re: [Yade-users] (no subject)
>In the TriaxialCompressionEngine, I think there is a booleen that you
swith from 1 to 0 to stop the computation when the compaction is
don't remember the name of the booleen, but it should be
>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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