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[Jérôme Duriez <question643878@xxxxxxxxxxxxxxxxxxxxx>]

Question #643878 on Yade changed:
https://answers.launchpad.net/yade/+question/643878

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Hi,

Let say you want to strain your sample along "x" axis, and that the
sample spans along this axis from xMin to xMax

UniaxialStrainer does this by directly imposing some opposite x
velocities to these two set of bodies (negIds and posIds) that locate at
or around xMin, and xMax (at, or around, since you would usually take
some thickness for this layer of controlled bodies)

- negIds being the bodies located at x = xMin
- while posIds are at xMax

With respect to your question, all these bodies should belong to plans
that are perpendicular to the x axis.

Hoping the situation is now clearer to you, would you have a specific
suggestion to rephrase the doc at [1,2,3], in case this doc was unclear
?

[1] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.UniaxialStrainer
[2] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.UniaxialStrainer.negIds
[3] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.UniaxialStrainer.posIds

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