New question #688321 on Yade:
https://answers.launchpad.net/yade/+question/688321
Hi all,
I tried to move a sphere(Cpmmat) using a utilsbox acting as a wall(Frictmat). I
want to restrain the degrees of freedom in the other two directions but when I
do that, the wall tends to fly away after bouncing on the sphere. Here is a MWE
of that phenomenon. Kindly help me to understand where I have gone wrong.
########
from yade import pack, qt, export, ymport, plot
O.reset()
concrete_material=CpmMat(
young = 1e10,
density=1400,
poisson = 0.25,
frictionAngle = radians(40),
epsCrackOnset = 1e-4,
relDuctility = 10,
sigmaT = 1e18,
label='concrete_mat'
)
mat1=O.materials.append(concrete_material)
#O.materials.append(FrictMat(frictionAngle=0,density=0,label='walls'))
O.bodies.append([
sphere(center=(0,0,0),radius=.5,fixed=False,material=concrete_material),
])
O.materials.append(FrictMat(frictionAngle=0,density=0,label='walls'))
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(aabbEnlargeFactor=1,label='bo1s'),Bo1_Facet_Aabb(),Bo1_Wall_Aabb(),Bo1_Box_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=1,label='ig2s'),Ig2_Facet_Sphere_ScGeom(),Ig2_Wall_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys(),
Ip2_CpmMat_CpmMat_CpmPhys(cohesiveThresholdIter=1)],
[Law2_ScGeom_FrictPhys_CundallStrack(),
Law2_ScGeom_CpmPhys_Cpm()]
),
NewtonIntegrator(gravity=(0,0,0),damping=0.5),
#CpmStateUpdater(iterPeriod=1),
GlobalStiffnessTimeStepper(active=True,timeStepUpdateInterval=1,timestepSafetyCoefficient=0.8),
]
O.step()
U_box= utils.box((.5,1,-.5),(1,0,.5),fixed=True,wire=False,color=(1,0,0))
O.bodies.append(U_box)
U_box.state.mass=1
U_box.state.inertia = (1,1,1)
U_box.state.blockedDOFs = "xzXYZ"
U_box.state.vel=(0,-0.01,0)
yade.qt.View()
O.saveTmp()
######
Many thanks in advance - Arun
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