New question #464883 on Yade:
https://answers.launchpad.net/yade/+question/464883
I'm trying to get values of final porosity for different internal friction
angle after every isocompression. With the increment of 'internal friction
angle' the value of porosity should be increased. But I found porosity doesn't
increasing with the increasing value of internal friction angle. I found
friction angle=porosity: 0.1=.3855, 10=.4200, 20=.4374, 30=.4408 40=.4319
50=4085, 60=.4114, 70=.4346, 80=.4413, 90=.4367, 100=.4240. Don't understand
why this is happening. Please help me out
my simulation script:
========================================
# encoding: utf-8
# periodic triaxial test simulation
sigmaIso=-1e5
#import matplotlib
#matplotlib.use('Agg')
# generate loose packing
from yade import pack, qt, plot
O.periodic=True
O.materials.append(FrictMat(young=60000000,poisson=.3,density=2600,frictionAngle=60,label='spheres',))
sp = pack.SpherePack()
sp.makeCloud(minCorner=(0,0,0),maxCorner=(.1,.1,.1),rMean=0.002,rRelFuzz=0.0001,num=4000,periodic=True,seed=1)
sp.toSimulation()
O.cell.hSize = Matrix3(.1,0,0, 0,.1,0, 0,0,.1)
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]
),
PeriTriaxController(label='triax',
# specify target values and whether they are strains or stresses
goal=(sigmaIso,sigmaIso,sigmaIso),stressMask=7,
# type of servo-control
dynCell=True,maxStrainRate=(1000,1000,1000),
# wait until the unbalanced force goes below this value
maxUnbalanced=.000001,relStressTol=2e-3,
# call this function when goal is reached and the packing is
stable
doneHook='compactionFinished()'
),
NewtonIntegrator(damping=.2),
PyRunner(command='addPlotData()',iterPeriod=500),
]
O.dt=.5*PWaveTimeStep()
def addPlotData():
plot.addData(unbalanced=unbalancedForce(),i=O.iter,
sxx=triax.stress[0],syy=triax.stress[1],szz=triax.stress[2],
exx=triax.strain[0],eyy=triax.strain[1],ezz=triax.strain[2],
Z=avgNumInteractions(),
porosity=porosity(),
# save all available energy data
Etot=O.energy.total(),**O.energy
)
plot.saveDataTxt('macroFile',vars=('i','sxx','syy','szz','exx','eyy','ezz',
'unbalanced','porosity'))
# enable energy tracking in the code
O.trackEnergy=True
# define what to plot
plot.plots={'i':('porosity',),'i ':('sxx','syy','szz'),' i':('exx','eyy','ezz'),
# energy plot
'ezz':('szz'),
}
# show the plot
plot.plot()
def compactionFinished():
print 'IsoCompression Finished'
O.Pause()
# set the current cell configuration to be the reference one
O.cell.trsf=Matrix3.Identity
# change control type: keep constant confinement in x,y, 20%
compression in z
triax.goal=(sigmaIso,sigmaIso,-0.1)
triax.stressMask=3
# allow faster deformation along x,y to better maintain stresses
triax.maxStrainRate=(1000,1000,.001)
# next time, call triaxFinished instead of compactionFinished
triax.doneHook='triax1Finished()'
# do not wait for stabilization before calling triaxFinished
triax.maxUnbalanced=0.0001
def triax1Finished():
print 'Triaxial1 Finished'
O.Pause()
================================================
Please give me suggestion what should I do? Thanks in advance.
toufiq
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