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[Robert Caulk <question684846@xxxxxxxxxxxxxxxxxxxxx>]

Question #684846 on Yade changed:
https://answers.launchpad.net/yade/+question/684846

    Status: Open => Answered

Robert Caulk proposed the following answer:
Hello Leonard,

> I am confused about the concept of the plastic part of normal
displacement (un^p) in

It is the unrecoverable deformation associated with the contact. The
plastic deformation occurs when adhesion is exceeded and the maximum
plasticity is not exceeded [1]. This model is not active by default, it
is only actived if the material is set with fragile=true [2].

>Why there is a difference between Yade document and these papers?

Either a) the papers didn't use plasticity, (i.e. fragile=false) or b)
the plasticity feature was added after the papers were published.

Cheers,

Robert

[1]https://gitlab.com/yade-dev/trunk/blob/master/pkg/dem/CohesiveFrictionalContactLaw.cpp#L124
[2]https://yade-dev.gitlab.io/trunk/yade.wrapper.html?highlight=cohfrict#yade.wrapper.CohFrictPhys.fragile

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