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Message #21101
[Question #685323]: Friction between walls and 'rock'
New question #685323 on Yade:
https://answers.launchpad.net/yade/+question/685323
Hello everyone,
I am trying to simulate an indirect tensile test. I would like
to take in account the friction between the walls and ‘rock’.
Even thought i assign properties to the walls the results
do not differ.
Could you point what am i doing wrong. Thanx
Here is the code.
from __future__ import print_function
from yade import pack, plot
################# BRAZILIAN SIMULATION DEFINED HERE
####Material microproperties from table
readParamsFromTable(noTableOk=True, # unknownOk=True,
Specimen_Radius = 0.02735,
Specimen_Thickness = 0.025,
Sphere_Radius = 1e-3,
intR=1.15,
DENSITY=2700,
YOUNG=100e9,
FRICTION_ANGLE=30,
POISSON=1,
TENS=10e6,
COH=100e6,
)
from yade.params.table import *
#### material definition
Sample = O.materials.append(JCFpmMat(
young=YOUNG,
poisson=POISSON,
frictionAngle=radians(FRICTION_ANGLE),
cohesion=COH,
tensileStrength=TENS,
density = DENSITY,
label='spheres'
))
#### create the specimen
sp=pack.randomDensePack(
pack.inCylinder((0,0,0),(Specimen_Thickness,0,0),Specimen_Radius),
radius = Sphere_Radius,
spheresInCell = 1000,
material=Sample,
rRelFuzz=0.2,
memoizeDb = '/tmp/packing-brazilian.db',
returnSpherePack = True,
)
sp.toSimulation()
# walls
zMin,zMax=[pt[2] for pt in aabbExtrema()]
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'))
walls = wallMin,wallMax = [O.bodies[i] for i in wallIDs]
v =1
wallMin.state.vel = (0,0,+v)
wallMax.state.vel = (0,0,-v)
#engines
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(aabbEnlargeFactor=intR,label='is2aabb'),Bo1_Wall_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=intR,label='ss2sc'),Ig2_Wall_Sphere_ScGeom()],
[Ip2_JCFpmMat_JCFpmMat_JCFpmPhys(cohesiveTresholdIteration=1,label='interactionPhys')],
[Law2_ScGeom_JCFpmPhys_JointedCohesiveFrictionalPM(recordCracks=True,Key=OUT,label='interactionLaw')],
),
GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=10,timestepSafetyCoefficient=0.5, defaultDt=utils.PWaveTimeStep()),
NewtonIntegrator(damping=0.5),
PyRunner(iterPeriod=100,command='addPlotData()',initRun=True),
PyRunner(iterPeriod=100,command='stopIfDamaged()'),
]
# stop condition
def stopIfDamaged():
if O.iter < 10: # do nothing at the beginning
return
SMax = max(plot.data["stress"])
S = plot.data["stress"][-1]
if S<(0.8*SMax):
print("Damaged, stopping.")
print("ft = ",max(plot.data["stress"]))
O.pause()
# plot stuff
def addPlotData():
# forces of walls. f1 is "down", f2 is "up" (f1 needs to be negated for evlauation)
f1,f2 = [O.forces.f(i)[2] for i in wallIDs]
f1*=-1
# average force
f = 0.5*(f1+f2)
# displacement (2 times each wall)
wall = O.bodies[wallIDs[0]]
dspl = 2*wall.state.displ()[2]
# stress (according to standard brazilian test evaluation formula)
stress = f/(pi*Specimen_Radius*Specimen_Thickness)
# store values
yade.plot.addData(
t = O.time,
i = O.iter,
dspl = dspl,
stress = stress,
te = interactionLaw.nbTensCracks,
se = interactionLaw.nbShearCracks,
)
plot.saveDataTxt(OUT)
# plot dspl on x axis, stress on y1 axis and f,f1,f2 in y2 axis
plot.plots={'dspl':'stress'}
O.step();
ss2sc.interactionDetectionFactor=1.
is2aabb.aabbEnlargeFactor=1.
plot.plot()
O.run()
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