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[Luc Sibille <question248700@xxxxxxxxxxxxxxxxxxxxx>]

Question #248700 on Yade changed:
https://answers.launchpad.net/yade/+question/248700

    Status: Open => Answered

Luc Sibille proposed the following answer:
Hi Luis,

There is a problem with the definition of the material properties (I
imagine the default material is not a CohFricMat material but rather a
FricMat?), by defining a CohFricMat material as introduced below in your
script it works:

#exercicio de Law

# basic simulation showing sphere falling ball gravity,
# bouncing against another sphere representing the support

# DATA COMPONENTS

# add 2 particles to the simulation
# they the default material (utils.defaultMat)

matSph=CohFrictMat(
	young=170e6,
	poisson=0.2,
	frictionAngle=radians(17),
	isCohesive=False,
	alphaKr=1.8,
	alphaKtw=0,
	etaRoll=1.8,
	momentRotationLaw=True,
	density=2600,
	label='spheres',
) 

O.materials.append(matSph)


O.bodies.append([
# fixed: particle's position in space will not change (support)
utils.sphere(center=(0,0,0),radius=.5,fixed=True,material='spheres'),
# this particles is free, subject to dynamics
utils.sphere((0,0,2),.5,material='spheres')
])

# FUNCTIONAL COMPONENTS

# simulation loop -- see presentation for the explanation
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom6D()],
[Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(label="cohesiveIp")],
[Law2_ScGeom6D_CohFrictPhys_CohesionMoment(label="cohesiveLaw")]

),
# apply gravity force to particles
GravityEngine(gravity=(0,0,-9.81)),
# damping: numerical dissipation of energy
NewtonIntegrator(damping=0.1)
]

O.dt=.5e-3*utils.PWaveTimeStep()


Best,
Luc

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