Question #693808 on Yade changed:
https://answers.launchpad.net/yade/+question/693808

ytang posted a new comment:
Hi Jan,

I know that during the isotropic compression stage the stresses in the
three directions are the same. If the stresses are not the same, there
will be no deviatoric stage.

As we all know, in a triaxial test, the confining pressure should be a
constant value even if in the deviatoric loading stage.  (if the
deviatoric loading is in the Y direction, the confining pressure in the
X and Z directions should be the same value.)

I use two models. all the code is the same except for the constitutive model. 
The confining pressure in the Cundall model is the same in the X and Z 
directions, which is 100kPa, while the confining pressure in the Hertz model is 
not the same (one is 110kPa, another is 90kPa). 


I'm wondering why the confining pressure is not the same during the deviatoric 
stage?

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