yade-users team mailing list archive

[nejib hadda <nejib.hadda@xxxxxxxxxxx>]

Controlling in strains only does not lead the specimen to a brutal
failure, I want to see what happens to the specimen if I add a small
axial load at a given state of the unstable zone. 





Le jeudi 15 avril 2010 à 18:46 +0200, Jerome Duriez a écrit :
> I would say that the simplest is to control in strain only (set
> stressControl_1=stressControl_2=stressControl_3=False), and to set
> directly values of strain_rate1, strain_rate2, strain_rate3 such that 
> strain_rate1+strain_rate2+strain_rate3=0
> 
> What do you think about this ?
> 
> Jerome
> 
> 
> nejib hadda a écrit : 
> > Hi Jerome,
> > 
> >   I'm using the ThreeDtriaxialengine, and it gives the possibility to
> > control in stress and strain at the same time. And using your notation
> > downhere, I would like to make E22 and E33 follow E11 in such a way that
> > Ev=0.
> > 
> > 
> > Le jeudi 15 avril 2010 à 16:04 +0200, Jerome Duriez a écrit :
> >   
> > > Hello Nejib,
> > >  From a general point of view if we note 1(=axial for ex), 2,3 
> > > (=laterals) the directions of the space, L1, L2, L3 the size of your 
> > > specimen in these three directions, and v1, v2 and v3 the speeds at 
> > > which you displace your walls in these three directions I would say that 
> > > you will be at a constant volume if you keep v1/L1 + v2/L2 + v3/L3 =0
> > > (No more stress control by this way, your test will be fully strain 
> > > controlled)
> > > 
> > > Jerome
> > > 
> > > nejib hadda a écrit :
> > >     
> > > > Hi,
> > > > 
> > > > I like to make the sum of the lateral strains equal to the opposite of
> > > > the axial strain so that the volumetric strain is null (Undrained
> > > > triaial test).
> > > > stains' computing depend on the 3 axes, is it possible to compute the
> > > > lateral strains function of the axial one (stress controlled) or it
> > > > would have an impact on the results?
> > > > 
> > > > if not, I'll appreciate any other alternative to perform an undrained
> > > > triaxial test.
> > > > 
> > > > thanks  
> > > > 
> > > >  
> > > > 
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> > > >   
> > > >       
> > 
> >   
> 
> -- 
> Jérôme Duriez
> ATER Iut 1 Grenoble, département GMP - Laboratoire 3S-R
> 04.56.52.86.49 (ne pas laisser de messages sur le répondeur)
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