Yade

Viscoelastic material

Asked by Hotei

Hello community: I wanted to know if there is any way to simulate a viscoelastic material such as asphalt in YADE. Thanks a lot in advance.

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Bruno Chareyre
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Robert Caulk (rcaulk) said : 		#1

Are you looking for [1]?

[1] https://yade-dem.org/doc/yade.wrapper.html#yade.wrapper.Law2_ScGeom_ViscElPhys_Basic

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Hotei (hotei-mat) said : 		#2

I am not sure but I have to try first. I think that a viscoelastic contact law does not necessarily imply a viscoelastic behaviour of the whole set of spheres

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Best Bruno Chareyre (bruno-chareyre) said : 		#3

Hi, could specify what kind of visco-elasticity you are looking for (not an expert of asphalt myself)?
Yade has (at least):
- a parallel spring-dashpot model for the normal force (usual Walton-Braun type of, a.k.a Kelvin-Voigt [1])
- the previous one with an additional instantaneous spring (Standard Linear Solid [1]), applied to both normal and shear forces (and combined with friction for the shear force)
- the previous one with a non-linear dashpot as defined by the lubrication approximation [2], again for normal and shear directions
An ample choice... and my guess is that all of them will produce macroscopic visco-elasto-plasticity of some kind.
Bruno

[1] https://en.wikipedia.org/wiki/Viscoelasticity
[2] http://link.springer.com/article/10.1007/s10035-015-0560-6

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Hotei (hotei-mat) said : 		#4

Hello Bruno:
I am not expert in neither viscoelasticity nor in asphalt, but I think that with the options you give me in your answer I will solve my problem. Thank you very much!

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Hotei (hotei-mat) said : 		#5

Thanks Bruno Chareyre, that solved my question.

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Bruno Chareyre (bruno-chareyre) said : 		#6

My mistake: the second in the list is actually a Maxwell type [1] (i.e. continuous creep under constant load).
The third one is still SLS extended to non-linear viscosity.
B

[1] https://en.wikipedia.org/wiki/Viscoelasticity