principal stress rotation

Asked by xuq on 2019-08-27

I'm trying ti achieve the principal stress rotation process,
and I'm using TriaxialStressController now.
I want to change the stress to control stress , but it can only control the stress in x,y,z axial.But I need to control the shear stress on the wall, and I don't know how to achieve it.
And I don't quite understand how to achieve rotation process,or any one can give some examples?

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Jérôme Duriez (jduriez) said : #1


TriaxialStressController control algorithms only consider normal components ie xx,yy,zz (goal1,goal2,goal3). In terms of stress, those are the only components relevant if you have frictionless walls, as it is expected from YADE users / experimentalists in the lab.
With frictional walls, triax.stress(0) (with triax the TriaxialStressController instance in your simulation) may include non-zero shear stress, but you will not be able to control them.

I guess the solution is (as in experiments ?) to change the geometric configuration of your simulation and switch to e.g. simple shear -- see KinemCNLEngine and related engines if you wish --, hollow cylinder, ....

xuq (xuq) said : #2

Thank you ,Jduriez
I have seen the KinemCNLEngine,but I think it can control simple shear, and it can't achieve principal stress rotation...
So do you have any suggestion more? or some examples of it is also ok...

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