Question #688439 on Yade changed:
https://answers.launchpad.net/yade/+question/688439
Elham Hosseinkhani posted a new comment:
Hello,
Unfortunately,I couldn't get the results that I expected based on the papers. I
changed my script and modify the script in YADE examples. I added
CohesionMomentLaw and necessary parameters like alphaKr and etaRoll. I get
PrincipalStressRatio about 2.4 with this parameters in this script. But I
expect more PrincipalStressRatio after using CohesionMomentLaw.
Could you please run this script and check PrincipalStressRatio?
Is there any problem that i couldn't get changes in PrincipalStressRatio and
peak friction angle?
# -*- coding: utf-8 -*-
from yade import pack
nRead=readParamsFromTable(
num_spheres=10000,
young = 500e6,
poisson = 0.4,
compFricDegree = 30,
alphaKr = 1.25,
etaRoll = 0.55,
finalFricDegree = 30,
targetPorosity = 0.4,
confining =-300000,
unknownOk=True
)
from yade.params import table
num_spheres=table.num_spheres
young = table.young
poisson = table.poisson
compFricDegree = table.compFricDegree
alphaKr = table.alphaKr
etaRoll = table.etaRoll
finalFricDegree = table.finalFricDegree
targetPorosity = table.targetPorosity
confining = table.confining
rate=-0.02
damp=0.2
key='_P='+str(confining)
stabilityThreshold=0.01
mn,mx=Vector3(0,0,0),Vector3(1,2,1)
O.materials.append(CohFrictMat(young=young,poisson=poisson,density=2600,frictionAngle=radians(compFricDegree),normalCohesion=1e6,shearCohesion=1e6,alphaKr=alphaKr,alphaKtw=1e-10,momentRotationLaw=True,etaRoll=etaRoll,label='spheres'))
O.materials.append(FrictMat(young=young,poisson=poisson,frictionAngle=0,density=0,label='walls'))
walls=aabbWalls([mn,mx],thickness=0,material='walls')
wallIds=O.bodies.append(walls)
sp=pack.SpherePack()
clumps=False
if clumps:
volume = (mx[0]-mn[0])*(mx[1]-mn[1])*(mx[2]-mn[2])
mean_rad = pow(0.09*volume/num_spheres,0.3333)
c1=pack.SpherePack([((-0.2*mean_rad,0,0),0.5*mean_rad),((0.2*mean_rad,0,0),0.5*mean_rad)])
sp.makeClumpCloud(mn,mx,[c1],periodic=False)
sp.toSimulation(material='spheres')
O.bodies.updateClumpProperties()
else:
sp.makeCloud(mn,mx,-1,0.3333,num_spheres,False, 0.95,seed=1) #"seed" make the
"random" generation always the same
O.bodies.append([sphere(center,rad,material='spheres') for center,rad in sp])
triax=TriaxialStressController(
maxMultiplier=1.+2e5/young,
finalMaxMultiplier=1.+2e4/young,
thickness = 0,
stressMask = 7,
internalCompaction=True,
)
newton=NewtonIntegrator(damping=damp)
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(),Ig2_Box_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys(),Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(label="cohesiveIp")],
[Law2_ScGeom_FrictPhys_CundallStrack(),Law2_ScGeom6D_CohFrictPhys_CohesionMoment(
useIncrementalForm=True,
always_use_moment_law=False,
label='cohesiveLaw')]
),
GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.8),
triax,
TriaxialStateRecorder(iterPeriod=100,file='WallStresses'),
newton
]
Gl1_Sphere.stripes=0
if nRead==0: yade.qt.Controller(), yade.qt.View()
triax.goal1=triax.goal2=triax.goal3=confining
while 1:
O.run(1000, True)
unb=unbalancedForce()
print ('unbalanced force:',unb,' mean stress: ',triax.meanStress)
if unb<stabilityThreshold and
abs(confining-triax.meanStress)/abs(confining)<0.01:
break
import sys
while triax.porosity>targetPorosity:
compFricDegree = 0.95*compFricDegree
setContactFriction(radians(compFricDegree))
print ("\r Friction: ",compFricDegree," porosity:",triax.porosity)
sys.stdout.flush()
O.run(500,1)
#############################
## DEVIATORIC LOADING ###
#############################
triax.internalCompaction=False
setContactFriction(radians(finalFricDegree))
triax.stressMask = 5
triax.goal2=rate
triax.goal1=confining
triax.goal3=confining
O.engines[2].lawDispatcher.functors[1].always_use_moment_law = True
#cohesiveLaw.always_use_moment_law=True
triax.wall_bottom_activated=False
newton.damping=0.1
O.saveTmp()
from yade import plot
def history():
plot.addData(e11=-triax.strain[0], e22=-triax.strain[1],
e33=-triax.strain[2],
ev=-triax.strain[0]-triax.strain[1]-triax.strain[2],
s11=-triax.stress(triax.wall_right_id)[0],
s22=-triax.stress(triax.wall_top_id)[1],
s33=-triax.stress(triax.wall_front_id)[2],
PrincipalStressRatio=abs((-triax.stress(3)[1])/((-triax.stress(triax.wall_right_id)[0]-triax.stress(triax.wall_front_id)[2])/2)),
q=-triax.stress(triax.wall_top_id)[1]-(-triax.stress(triax.wall_right_id)[0]-triax.stress(triax.wall_front_id)[2])/2.0,
i=O.iter)
if 1:
O.engines=O.engines[0:5]+[PyRunner(iterPeriod=20,command='history()',label='recorder')]+O.engines[5:7]
else:
O.engines[4]=PyRunner(iterPeriod=20,command='history()',label='recorder')
O.run(1000,True)
plot.plots={'e22':('PrincipalStressRatio',None,'ev')}
plot.plot()
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