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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