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Re: [Question #694134]: How to use only rolling but no twisting when using CohFricMat.

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From: Jérôme Duriez <question694134@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 25 Nov 2020 09:45:52 -0000
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Question #694134 on Yade changed:
https://answers.launchpad.net/yade/+question/694134

Jérôme Duriez posted a new comment:
> I didn't get the meaning of the "(belt and suspender)"

It comes from a French expression.. ;-) Which you can use to speak about two measures to prevent a risk, when just one is enough.
I see some theoretical differences among all choices in "Ktw =0 or etaTwist=0" and "Ktw =0 and etaTwist=0" (the torque will be null  either because of a zero elastic stiffness or because of a zero limit plastic threshold, or both) but the consequence is always the same.

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