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[Jérôme Duriez <question685323@xxxxxxxxxxxxxxxxxxxxx>]

Question #685323 on Yade changed:
https://answers.launchpad.net/yade/+question/685323

Jérôme Duriez proposed the following answer:
Hi,

Another test could be to inspect your "wall" and "rock" bodies (mixing
here bodies and Material but I hope you get the point) and see whether
they do have different Material properties, or not.

With the following in your script:
> wallIDs = O.bodies.append([wall((0,0,z),2) for z in (zMin,zMax)])
> O.materials.append(JCFpmMat(young=150e9,poisson=1,frictionAngle=radians(65),density=150e10,label='wall'))

your wall bodies (of Ids wallIDs) will have as material properties the one of O.materials['spheres'], because it's the last material defined at the time you create these wall bodies. 
On the other hand, O.materials['wall'] seems to me as being never applied to any body here.

I'm fearing you're actually not imposing what you wanted to.

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