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[Chareyre <bruno.chareyre@xxxxxxxxxxxxxxx>]

Thanks Jerome,
It is a bug at least in the sense that sign convention should be
explained in the documentation.
If we want to fix the only option is to make applied pressure negative
in compression.
Geomechanics convention is not an option. It would make
TriaxialStressController inconsistent will all other engines in Yade
(PeriodicTriax, TesselationWrapper, etc), it would be even worst.
Changing the pressure sign convention needs some tedious changes in many
check/example scripts, if you or someone wants to change it please be
very careful that those scripts are updated accordingly.

Bruno

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https://bugs.launchpad.net/bugs/1381282

Title:
  Sign convention in TriaxialStressController not consistent ?

Status in Yet Another Dynamic Engine:
  New

Bug description:
  Hi,

  When used as stress or strain rates, sign convention of "goal1/2/3"
  attributes of TriaxialStressController engine seem to me as not
  consistent.

  Positive values for stress goals correspond indeed to compression, whereas positive values for goal strain rates involve extension.
  Which is itself not consistent with TriaxialStressController.strain variable (in the end, to obtain positive TriaxialStressController.strain, you need to set negative strain rates goal variables).

  Not difficult to fix, but maybe require a common decision. (I vote
  myself for geomechanics convention)

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