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: [email protected] >Data: 10/12/2009 14.17 >A: <yade- [email protected]> >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 ? >>>> >>>> >>>> >>>> >>>> >>>> >>>> ------------------------------------------------------------------------ >>>> >>>> _______________________________________________ >>>> Mailing list: https: //launchpad.net/~yade-users >>>> Post to : [email protected] >>>> Unsubscribe : https://launchpad.net/~yade-users >>>> More help : https: //help.launchpad.net/ListHelp >> >> > >-- >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 > >_______________________________________________ >Mailing list: https: //launchpad.net/~yade-users >Post to : [email protected] >Unsubscribe : https://launchpad.net/~yade-users >More help : https://help. launchpad.net/ListHelp > _______________________________________________ Mailing list: https://launchpad.net/~yade-users Post to : [email protected] Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
