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[Arthur Mercier <question159902@xxxxxxxxxxxxxxxxxxxxx>]

Question #159902 on Yade changed:
https://answers.launchpad.net/yade/+question/159902

    Status: Answered => Open

Arthur Mercier is still having a problem:
Thanks for your quick answers,

Actually, I'm lost with all these constitutive laws. I'd like to
simulate a flexural test on a reinforced concrete beam, like here
http://www.substech.com/dokuwiki/lib/exe/fetch.php?w=&h=&cache=cache&media=3-point_flexure.png.

So basically, it's a rectangular box of concrete with 1 (or 2) reinforcement bar in the lower part.
I'd like to have different points of view for the best way to do it.

1) What is the best way to model the concrete? I mean, I think to fill a rectangular box with 3 different sizes of particles, like radius1=3.5e-3, radius2=0.8*radius1, radius3=0.6*radius1; in order to get a better model of the real concrete (different sizes of grains: sand, gravel...).
Maybe it could be done in the "last step", cause it will increase (a lot)  the number of particles, so at the beginning I can start with only one particle size.

2) So I think that I'll model the reinforcement bars with cylinders. But
is it a good way for the cohesion between bars and concrete? There is a
publication about reinforced concrete and DEM (Discrete element modeling
of reinforced concrete with a particular steel-concrete interface J.
Rousseau, Ph. Marin & L. Daudeville), where the reinforcement bar is
modeled by vertical spheres only,
http://www.2shared.com/photo/WG92-AAV/reinforced_concrete.html? the
concrete is gray, steel bar in red and the support in blue. Is this way
a better one?

3) How can I simulate a flexural test? like that
http://www.substech.com/dokuwiki/lib/exe/fetch.php?w=&h=&cache=cache&media=3-point_flexure.png
Once again, what is the best way to do it? Is there a function similar
to the unixialstrainer to do it? 'Cause a solution is to do it with
forceEngine applied directly on spheres, but it's not convenient at all.
Another solution would be to create a rectangular geometry and to apply
a stress on it.

4) So if I want to model a flexural test, I also need supports. Spheres
of boxes? Like here https://yade-
dem.org/wiki/Scr:DEM_with_local_moment_law

5) Which IPhysDispatcher Ip2 I'll need? Does it seem realistic for you
Ip2_CpmMat_CpmMat_CpmPhys for the concrete and
Ip2_WireMat_WireMat_WirePhys for the steel?

6) Which constitutive law Law2 I'll need?

7) Finally, what about the geometry and degrees of freedom? Most of time
there are only 3 degrees of freedom, am I right? why not 6?

Thanks for your patience !

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