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Re: [Branch ~yade-pkg/yade/git-trunk] Rev 3541: Many changes towards a more consistent sign convention throughout the code for stresses and strai...

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I m commiting something for that (rev 3553). Honestly, I doubt someone ever used "internalCompaction" satisfactorily for such isotropic tension before. Because, in the previous code, radii increased when sigmaIso < meanStress < 0.

But the algorithm should handle such case now !


________________________________
From: Yade-dev [yade-dev-bounces+jerome.duriez=ucalgary.ca@xxxxxxxxxxxxxxxxxxx] on behalf of Bruno Chareyre [bruno.chareyre@xxxxxxxxxxxxxxx]
Sent: December 4, 2014 1:34 AM
To: yade-dev@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Yade-dev] [Branch ~yade-pkg/yade/git-trunk] Rev 3541: Many changes towards a more consistent sign convention throughout the code for stresses and strai...

You are right on maxMultiplier, it should be improved. The consequence is that convergence to a traction state is sub-optimal (but still converging).
No I don't have a test script for that.

Bruno

On 03/12/14 23:20, Jerome Duriez wrote:
Obviously, I confess I did not consider isotropic traction...

I will definitively try to improve the commit if I broke something. Did the code, in previous state, work well for such situations ?

Considering l.205 of TSC [1], it seems to me that, in previous state for isotropic traction case, finalMaxMultiplier would be considered instead of maxMultiplier in non adequate situations.
What do you think ?

If you have a working example script that illustrates the behaviour of the previous code in isotropic traction, it would be obviously useful for me.

[1] https://github.com/yade/trunk/commit/19e81a785b19a8eab2718ebb5ad5eb9456355818#diff-e3491e9c63e91170258c65eec9377298L203


________________________________
From: Yade-dev [yade-dev-bounces+jerome.duriez=ucalgary.ca@xxxxxxxxxxxxxxxxxxx<mailto:yade-dev-bounces+jerome.duriez=ucalgary.ca@xxxxxxxxxxxxxxxxxxx>] on behalf of Bruno Chareyre [bruno.chareyre@xxxxxxxxxxxxxxx<mailto:bruno.chareyre@xxxxxxxxxxxxxxx>]
Sent: December 3, 2014 1:42 PM
To: yade-dev@xxxxxxxxxxxxxxxxxxx<mailto:yade-dev@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Yade-dev] [Branch ~yade-pkg/yade/git-trunk] Rev 3541: Many changes towards a more consistent sign convention throughout the code for stresses and strai...

Hi Jérome,
There is a problem in this commit, see lines [1].
You replaced:
siso = goal1 + goal2 + goal3
by
siso = abs(goal1 + goal2 + goal3)

So now it is impossible to define isotropic traction as a target state.
Stresses and strains have signs, there should not be any abs() function applied on them except in a few special cases, else it breaks the algorithms.

Cheers.

Bruno


[1] https://github.com/yade/trunk/commit/19e81a785b19a8eab2718ebb5ad5eb9456355818#diff-e3491e9c63e91170258c65eec9377298L203
see also:
https://github.com/yade/trunk/commit/19e81a785b19a8eab2718ebb5ad5eb9456355818#diff-e3491e9c63e91170258c65eec9377298L210

On 19/11/14 01:18, noreply@xxxxxxxxxxxxx<mailto:noreply@xxxxxxxxxxxxx> wrote:

------------------------------------------------------------
revno: 3541
committer: jduriez <jerome.duriez@xxxxxxxxxxx><mailto:jerome.duriez@xxxxxxxxxxx>
timestamp: Tue 2014-11-18 12:46:27 -0700
message:
  Many changes towards a more consistent sign convention throughout the code for stresses and strains. Should fix e.g. https://bugs.launchpad.net/yade/+bug/1381282. The goal is to know directly the meaning of a strain or stress value each time one is encountered. Relying on the classical Continuum Mechanics convention (editorial choice...). A global announcement is planned in a couple of days, in case some errors appear in the meantime.
modified:
  examples/FluidCouplingPFV/oedometer.py
  examples/clumps/triax-basic-with-clumps.py
  examples/test/triax-basic.py
  examples/test/triax-cohesive.py
  examples/triax-tutorial/script-session1.py
  pkg/dem/CapillaryTriaxialTest.hpp
  pkg/dem/CohesiveTriaxialTest.hpp
  pkg/dem/TriaxialCompressionEngine.cpp
  pkg/dem/TriaxialCompressionEngine.hpp
  pkg/dem/TriaxialStressController.cpp
  pkg/dem/TriaxialStressController.hpp
  pkg/dem/TriaxialTest.hpp
  py/pack/pack.py
  scripts/checks-and-tests/checks/DEM-PFV-check.py
  scripts/checks-and-tests/checks/checkTestTriax.py


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--
_______________
Bruno Chareyre
Associate Professor
ENSE³ - Grenoble INP
Lab. 3SR
BP 53
38041 Grenoble cedex 9
Tél : +33 4 56 52 86 21
Fax : +33 4 76 82 70 43
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Mailing list: https://launchpad.net/~yade-dev
Post to     : yade-dev@xxxxxxxxxxxxxxxxxxx<mailto:yade-dev@xxxxxxxxxxxxxxxxxxx>
Unsubscribe : https://launchpad.net/~yade-dev
More help   : https://help.launchpad.net/ListHelp




--
_______________
Bruno Chareyre
Associate Professor
ENSE³ - Grenoble INP
Lab. 3SR
BP 53
38041 Grenoble cedex 9
Tél : +33 4 56 52 86 21
Fax : +33 4 76 82 70 43
________________

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