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Re: [Question #235138]: how to define friction at the boundaries in triaxial test

To: yade-users@xxxxxxxxxxxxxxxxxxx
From: Christian Jakob <question235138@xxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 04 Sep 2013 09:31:29 -0000
Reply-to: question235138@xxxxxxxxxxxxxxxxxxxxx
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Question #235138 on Yade changed:
https://answers.launchpad.net/yade/+question/235138

    Status: Open => Answered

Christian Jakob proposed the following answer:
Hi stephen,

Welcome to yade community.

In yade you have to define materials (e.g. one material for particles
and one for boundaries):

### properties:
density			= 2650
shear_modulus 	= 2e5
poisson_ratio 	= 0.15
young_modulus	= 2*shear_modulus*(1+poisson_ratio)

### define materials:
SphereMat = FrictMat(young=young_modulus,poisson=poisson_ratio,density=density,frictionAngle=0.5)
BoundaryMat = FrictMat(young=young_modulus,poisson=poisson_ratio,frictionAngle=1)

O.materials.append(SphereMat)
O.materials.append(BoundaryMat)

Then you can use the materials in the generation process:

O.bodies.append(sphere([0,0,0],radius=R, material = SphereMat, fixed=True))
O.bodies.append(geom.facetBox((0.035,0.035,0.035),(0.035,0.035,0.035),wallMask=15, material = BoundaryMat, dynamic=1))

Hope it helps,

Christian

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