Re: [Yade-users] [Question #684846]: what is the plastic part of normal displacement in law2-cohesionMoment

2019-11-22 Thread Leonard
Question #684846 on Yade changed:
https://answers.launchpad.net/yade/+question/684846

Status: Answered => Solved

Leonard confirmed that the question is solved:
Thanks Robert Caulk, that solved my question.

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Re: [Yade-users] [Question #684846]: what is the plastic part of normal displacement in law2-cohesionMoment

2019-11-21 Thread Robert Caulk
Question #684846 on Yade changed:
https://answers.launchpad.net/yade/+question/684846

Status: Open => Answered

Robert Caulk proposed the following answer:
Hello, that was a typo, fragile=True indicates that the plastic model
will not activate.

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Re: [Yade-users] [Question #684846]: what is the plastic part of normal displacement in law2-cohesionMoment

2019-11-20 Thread Leonard
Question #684846 on Yade changed:
https://answers.launchpad.net/yade/+question/684846

Status: Solved => Open

Leonard is still having a problem:
Hi Robert,
I am sorry that I open the question again.
>>This model is not active by default, it is only actived if the material is 
>>set with fragile=true [2].
However, the default value of fragile = true. 
Does it mean this model is active by default?

Thanks
Leonard

[2]https://yade-
dev.gitlab.io/trunk/yade.wrapper.html?highlight=cohfrict#yade.wrapper.CohFrictPhys.fragile

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Re: [Yade-users] [Question #684846]: what is the plastic part of normal displacement in law2-cohesionMoment

2019-10-09 Thread Leonard
Question #684846 on Yade changed:
https://answers.launchpad.net/yade/+question/684846

Status: Answered => Solved

Leonard confirmed that the question is solved:
Thanks Robert Caulk, that solved my question.

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Re: [Yade-users] [Question #684846]: what is the plastic part of normal displacement in law2-cohesionMoment

2019-10-09 Thread Robert Caulk
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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[Yade-users] [Question #684846]: what is the plastic part of normal displacement in law2-cohesionMoment

2019-10-09 Thread Leonard
New question #684846 on Yade:
https://answers.launchpad.net/yade/+question/684846

Hi,
I am confused about the concept of the plastic part of normal displacement 
(un^p) in Law2_ScGeom6D_CohFrictPhys_CohesionMoment [1].
I reviewed some papers such as "Discrete modeling of granular soils 
reinforcement by plant roots[2]" and "Calibration of DEM material parameters to 
simulate stress-strain behaviour of unsaturated soils during uniaxial 
compression[3]".
In these two papers, they use Law2_ScGeom6D_CohFrictPhys_CohesionMoment as the 
contact law, but there is no un^p in their model. 
Why there is a difference between Yade document and these papers? 

Thanks
Leonard

[1]https://yade-dev.gitlab.io/trunk/yade.wrapper.html?highlight=cohfrict#yade.wrapper.Law2_ScGeom6D_CohFrictPhys_CohesionMoment
[2]https://www.sciencedirect.com/science/article/pii/S0925857413001936?via%3Dihub
[3]https://www.sciencedirect.com/science/article/pii/S0167198718314909

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