Yade

Box interacton with gravity

Asked by Bernardo Albuquerque

Hello all,

I am trying to make an oedometric test but for some reasons I need the upper plane to be a body that interacts with the spheres inside the box. I attempted to create a box object and define its density according to the stress I want to aply in the test. For that i used the simple equation

 density = GoalStress * OedometerCrossSection / (gravity * BoxVolume)

However, I cant achieve the stress I am seeking. I am calculating this stress with O.forces.f(box#)/OedometerCrossSection. The interesting fact is that even if I change the box density the calculated stress is always the same. I first thought that the explanation to my problem was that box objects are not affected by gravity, but I performed a simple script and eliminated that hypothesis. Anybody knows what it could be?

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Jan Stránský (honzik) said : 		#1

Hi Bernardo,
there might be several reasons. Please provide a MWE (see [1], section 3)
thanks
Jan

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

Dne 3. 8. 2016 21:52 napsal uživatel "Bernardo Albuquerque" <
<email address hidden>>:

>

> New question #320069 on Yade:
> https://answers.launchpad.net/yade/+question/320069
<https://answers.launchpad.net/yade/+question/320069>
>
> Hello all,
>
> I am trying to make an oedometric test but for some reasons I need the
upper plane to be a body that interacts with the spheres inside the box. I
attempted to create a box object and define its density according to the
stress I want to aply in the test. For that i used the simple equation
>
> density = GoalStress * OedometerCrossSection / (gravity * BoxVolume)
>
> However, I cant achieve the stress I am seeking. I am calculating this
stress with O.forces.f(box#)/OedometerCrossSection. The interesting fact is
that even if I change the box density the calculated stress is always the
same. I first thought that the explanation to my problem was that box
objects are not affected by gravity, but I performed a simple script and
eliminated that hypothesis. Anybody knows what it could be?
>
> --
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