Bonded Powder Simulation (Visco-Elastic BInder)

Hello,

> New to yade

welcome :-)

> trying to model a bonded powder (grains), the binder should have visco-elastic properties.
> Is there a way to do it?

definitely there is a way. It depends on the definition of "the way" and expectations.
One possible way is to implement such model from the scratch..
One possible result is that even such model exists or is newly implemented, the results might not fit your requirements at all..

Why do you need DEM? Wouldn't e.g. a "continuum based" FEM better?

Could you provide more information about the the problem, i.e. material (powder size, PSD, ...), simulation expectations (spatial and time scales, ...)

> Another unrelated question

Please open a new question for an "unrelated question" ([1], point 5).
I think it could be interesting discussion, but it does not belong to this question.

Cheers
Jan

[1] https://www.yade-dem.org/wiki/Howtoask

Thanks,

i am trying to simulate asphalt mixture, thus i need to simulate the bitumen binder, is there any cohesive visco elastic model in YADE? and if there is, can i use it with polyhedral grains?

Hello,

please be more specific about your problem, this is still too short and too vague.
Please at least describe what problem would you simulate, what is whole domain size, particle sizes, what real time you would like to simulate (miliseconds, weeks?), ...

> is there any cohesive visco elastic model in YADE?

some (!) cohesion and viscosity is in Law2_ScGeom6D_CohFrictPhys_CohesionMoment [1].

> can i use it with polyhedral grains?

You can use "polyhedral grains" for this "ScGeom" law2, if their resulting geometry is of ScGeom type.
So you can use potential particles and Ig2_PP_PP_ScGeom or potential blocks and Ig2_PB_PB_ScGeom.

Before continuing, you really should ask (and answer :-) the following questions:

- why do you need DEM?
    - wouldn't another method (FEM) be more suitable?

- wouldn't explicit time integration in Yade with "very short" time step be problematic for your simulation?
    - w.g. if you simulate experiment that takes several days, I think explicit time integration would not be feasible..

- why do you need actual polyhedral grains?
    - would they interact with each other?
    - would spheres as the model simplification be sufficient?

Cheers
Jan

[1] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Law2_ScGeom6D_CohFrictPhys_CohesionMoment

Thanks for the answer,

What I want to simulate in a Brazilian disk tensile test of asphalt mixture. I thought about going with clumps as representation of the aggregates, but the polyhedral option I found in the documentation shows promise.

This figure from a paper shows a general idea of what i want to accomplish:

https://www.frontiersin.org/files/Articles/879245/fmats-09-879245-HTML/image_m/fmats-09-879245-g012.jpg

The full paper (Publicly open):

https://www.frontiersin.org/articles/10.3389/fmats.2022.879245/full

I would definitively start with spherical particles. It the most simple case from several points of view (simulation setup, computer costs, material laws, ...)
At least as the beginning with Yade, to learn the basics, what results you can expect, what material law does what etc.
I would start to complicate the situation (clumps, non-spheres, ...) after a while playing with spherical particles.
Just my opinion however.
Cheers
Jan

Thanks for the tips, appreciate