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Re: [Question #665246]: elastic-perfectly plastic material

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From: Jérôme Duriez <question665246@xxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 05 Mar 2018 16:08:51 -0000
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Question #665246 on Yade changed:
https://answers.launchpad.net/yade/+question/665246

    Status: Open => Answered

Jérôme Duriez proposed the following answer:
Hi,

There may be some confusion here.

1. FrictMat's doc [*] says "Elastic material with contact friction", and
I think "with contact friction" is as much important as "Elastic
material" for a proper understanding of this material.

The contact description usually obtained with FrictMat, through e.g.
Ip2_FrictMat_FrictMat_FrictPhys and Law2_ScGeom_FrictPhys_CundallStrack,
actually *is* elastic perfectly plastic in the tangential direction.


2. Generally speaking, I think the discussion would be simpler if you disregard for now constitutive relations for (volume) materials, and stick to contact laws expressing contact forces in terms of relative displacements between contacting particles.

In this framework, which contact behavior would you like to describe ?


Jerome


[*] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.FrictMat

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