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Re: [Question #295035]: Use of i.phys.unp to get null forces initially

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Jérôme Duriez <question295035@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 08 Jun 2016 23:32:06 -0000
Reply-to: question295035@xxxxxxxxxxxxxxxxxxxxx
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Question #295035 on Yade changed:
https://answers.launchpad.net/yade/+question/295035

Jérôme Duriez proposed the following answer:
For compressive situations at the contact scale, the unp numeric value
will stay the same as long as you do not change it a second time.

In particular, unp will stay equal to your initial penetrationDepth: the
initial overlap. Obviously, the penetrationDepth variable itself is free
to change during the simulation (because it needs to be, and is, updated
every time step), but this will not reflect into unp...

unp might evolve without any user's action in situations related to
tensile regime only (provided your simulation allows tensile loadings at
the contact scale, and you're using fragile = false)

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