Yade

Plan with no interactions

Asked by bruna

Hello everyone!

I'm trying to simulate a shear teste using yade. I want to track the forces in the shear band. For this I thought I could position a plan in the middle of my sample and measure the forces in this plan. However when I put this plan in the simulation it interacts with the spheres. In the manual there is 'sense' that allows me to set interactions in negative side, positive side or both sides of the plan (utils.wall) but it doesn't gives me the option of interactions in none.
My question is if there is a manner to measure the forces in a virtual plane in the middle of my sample. Putting a plan (utils.wall) is an option? If yes, is it possible to set this plan so that it doesn't interacts with my spheres?

Thanks a lot.

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Bruno Chareyre
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Best Bruno Chareyre (bruno-chareyre) said : 		#1

Hi Bruna,
You could always add a plane, get force, then reload the state before adding the plane and continue.
But overall it doesn't make much sense. The actual interactions in a sheared layer are unrelated to what you would get by forcing a plane in between (leading to huge forces since the plane will cut spheres randomly).

It needs more details to understand what you really have in mind. In fact there is non discontinuity of stress in a shear band, so you can as well use the stress exerted on the top boundary, it has to be the same.
Bruno

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bruna (brunamot) said : 		#2

Thanks a lot for your answer, Bruno. I had not thought of that. I was thinking that measuring the stress in the middle would be a good manner to observe the behaviour of the sample but use the stress exerted on the the boundary will be helpfull as well. Thanks again!

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bruna (brunamot) said : 		#3

Thanks Bruno Chareyre, that solved my question.