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Re: [Question #670862]: Applying normal strain rates in PeriTriaxController engine

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Bruno Chareyre <question670862@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 18 Jul 2018 17:03:23 -0000
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Question #670862 on Yade changed:
https://answers.launchpad.net/yade/+question/670862

    Status: Open => Answered

Bruno Chareyre proposed the following answer:
Hi,
The diagonal terms of the velocity gradient are controlled by PeriTriaxController.maxStrainRate.
You you change them directly it will be replaced by values from PeriTriaxController.
The off diagonal terms are free, you can change them independently of the controller (e.g. simple shear with imposed normal stress).

@Jérôme
"it is not possible to deactivate PeriTriaxController along certain axes: PeriTriaxController is missing something"

Sorry but no, I don't see anything missing. What would it be to "deactivate" along one axis? Rate=0?
Well, it is straightforward: goal=current.

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