yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxxxxxx>]

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 wrote:
> ------------------------------------------------------------
> revno: 3541
> committer: jduriez <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
>
>
> --
> lp:yade
> https://code.launchpad.net/~yade-pkg/yade/git-trunk
>
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Bruno Chareyre
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ENSE³ - Grenoble INP
Lab. 3SR
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