modelling "solid bridges" between particles

Asked by Rioual on 2019-09-09

Hello,

I would like to model solid bridges between particles of a packing as beams linking the particles together.
The beam model would be defined by a young modulus, a shear modulus, cross section and length.
The solid bridges at particle scale could brake when a certain stress exceeds the tensile strength of the material.
Is it possible to model this kind of solid bridge between particles with Yade ??
Couln't find any informations about that.

Thank you very much for informations,

Best wishes,

Fr.

Question information

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Yade Edit question
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Solved by:
Bruno Chareyre
Solved:
2019-09-10
Last query:
2019-09-10
Last reply:
2019-09-10
A Dinesh (adepu-dinesh-a) said : #1

Hi Rioual,

Yes you can model such kind of physics in Yade. To model such phenomena, we have to create bonds between particles,
which follow certain physics. These bonds are created to act like a cohesion force between the particles of the solid bridge.
And these bond will have a tension and shear stresses.

There are examples in yade which model this. See for example [1]. To understand the physics behind it, please look at [2],
which describes the physics as well as the implementation of the model in yade.

[1] https://gitlab.com/yade-dev/trunk/blob/master/examples/cylinders/bendingbeams.py
[2] https://dspace.cvut.cz/bitstream/handle/10467/79056/F1-D-2018-Smilauer-Vaclav-thesis.pdf?sequence=-1&isAllowed=y

Rioual (francois-rioual-v) said : #3

Hello Dinesh, Jan,

Thanks, but it is not clear to me how i can define a connection between the end of a cylinder and a sphere
representing a particle....?

regards,

FR.

Jan Stránský (honzik) said : #4

In the described approach, the "cylinder" is the interaction, the connection between spheres (as being interaction, it does not create interactions with other "cylinders" or spheres)

It is also possible to use physical cylinders able of further interactions, but I do not have personal experience with them.

So please be more specific on haw you define "solid bridges between particles" :-)

cheers
Jan

Rioual (francois-rioual-v) said : #5

...Yes, my question concerns more specifically the possibility of creating a physical cylindrical beam
 joining two spherical particles as a model of a solid bridge.(**)
 Each cylindrical beam will have the following parameters, length, cross section, young modulus, shear modulus
 and tensile strength....
??
Thanks for your views,
Fr.

(**) and also the possbility to join a particle, with several beams (bridges), to its neighbouring particles, of course.

Deepak (deepak-kn1990) said : #6

Hi,
 > Each cylindrical beam will have the following parameters, length, cross section, young modulus, shear modulus
 and tensile strength....

gridNode/gridConnections does exactly this, there are a few examples in [1] and for the physics of this model see [2]

[1] https://gitlab.com/yade-dev/trunk/tree/master/examples/grids
[2] https://doi.org/10.1016/j.ecoleng.2013.05.002

But I am not sure if grids are intended to undergo 'breakage'

I appreciate you are looking for something like [1], already mentioned by others.
Yes it can break [2], in principle, although it may not be a super-stable feature.
Bruno

[1] https://www.youtube.com/watch?v=H8VCdsW6wVA
[2] https://www.youtube.com/watch?v=oTS7aFu-ycE

Rioual (francois-rioual-v) said : #8

Thanks Bruno Chareyre, that solved my question.