Question #702047 on Yade changed:
https://answers.launchpad.net/yade/+question/702047
Status: Answered => Solved
Abderrahim AKIL confirmed that the question is solved:
Hello, thank you for your answer
###below is the script for the yade simulation
from __future__ import division
from __future__ import print_function
from future import standard_library
standard_library.install_aliases()
from yade import plot,pack,timing
import time, sys, os, copy
#import matplotlib
#matplotlib.rc('text',usetex=True)
#matplotlib.rc('text.latex',preamble=r'\usepackage{concrete}\usepackage{euler}')
# default parameters or from table
readParamsFromTable(noTableOk=True, # unknownOk=True,
young=7e9,
poisson=.2,
sigmaT=1.5e6,
frictionAngle=atan(0.6),
epsCrackOnset=1e-4,
relDuctility=30,
intRadius=1.5,
dtSafety=.8,
damping=0.4,
strainRateTension=.05,
strainRateCompression=.5,
setSpeeds=True,
# 1=tension, 2=compression (ANDed; 3=both)
doModes=1,
specimenLength=50e-3,
sphereRadius=0.75e-3,
# isotropic confinement (should be negative)
isoPrestress=0,
)
from yade.params.table import *
if 'description' in list(O.tags.keys()):
O.tags['id']=O.tags['id']+O.tags['description']
concreteId=O.materials.append(CpmMat(young=young,frictionAngle=frictionAngle,poisson=poisson,density=4800,sigmaT=sigmaT,relDuctility=relDuctility,epsCrackOnset=epsCrackOnset,isoPrestress=isoPrestress))
#create box to fill
mn,mx=Vector3(0,0,0),Vector3(specimenLength,specimenLength,specimenLength) #
corners of the initial packing
walls=aabbWalls([mn,mx],thickness=0)
wallIds=O.bodies.append(walls)
#fill it with air-voids
pred=pack.inAlignedBox(mn,mx)
sp=SpherePack()
sp.makeCloud(mn,mx,num=500,rMean=1e-3,rRelFuzz=0.6)
for c,r in sp:
pred = pred - pack.inSphere(c,r)
# Use the predicate to generate sphere packing inside
sp=SpherePack()
sp=pack.randomDensePack(pred,radius=sphereRadius,spheresInCell=500,memoizeDb='/tmp/triaxPackCache.sqlite',returnSpherePack=True)
sp.toSimulation(material=concreteId,color=(1,1,1))
phiS = getSpheresVolume()
phiS = phiS/(specimenLength)**3
p = porosity()
print(p,phiS)
bb=uniaxialTestFeatures()
negIds,posIds,axis,crossSectionArea=bb['negIds'],bb['posIds'],bb['axis'],bb['area']
O.dt=dtSafety*PWaveTimeStep()
print('Timestep',O.dt)
mm,mx=[pt[axis] for pt in aabbExtrema()]
coord_25,coord_50,coord_75=mm+.25*(mx-mm),mm+.5*(mx-mm),mm+.75*(mx-mm)
area_25,area_50,area_75=approxSectionArea(coord_25,axis),approxSectionArea(coord_50,axis),approxSectionArea(coord_75,axis)
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(aabbEnlargeFactor=intRadius,label='is2aabb'),],verletDist=.05*sphereRadius),
#Relative enlargement of the bounding box; deactivated if negative.; Functor
creating Aabb from Sphere.
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=intRadius,label='ss2sc')],
#Enlarge both radii by this factor (if >1), to permit creation of distant
interactions.InteractionGeometry will be computed when
interactionDetectionFactor*(rad1+rad2) > distance, Create/update a ScGeom
instance representing the geometry of a contact point between two Spheres s.
[Ip2_CpmMat_CpmMat_CpmPhys()],
[Law2_ScGeom_CpmPhys_Cpm()], #Constitutive law for the
cpm-model.
),
NewtonIntegrator(damping=damping,label='damper'),
CpmStateUpdater(realPeriod=.5),
UniaxialStrainer(strainRate=strainRateTension,axis=axis,asymmetry=0,posIds=posIds,negIds=negIds,crossSectionArea=crossSectionArea,blockDisplacements=False,blockRotations=False,setSpeeds=setSpeeds,label='strainer'),
PyRunner(virtPeriod=1e-6/strainRateTension,realPeriod=1,command='addPlotData()',label='plotDataCollector',initRun=True),
PyRunner(realPeriod=4,command='stopIfDamaged()',label='damageChecker'),
#SnapshotEngine(iterPeriod=50,fileBase='/tmp/bulldozer-',label='snapshooter'),
#VTKRecorder(iterPeriod=100,recorders=['all'],fileName='/tmp/p1-')
]
#O.miscParams=[Gl1_CpmPhys(dmgLabel=False,colorStrain=False,epsNLabel=False,epsT=False,epsTAxes=False,normal=False,contactLine=True)]
# plot stresses in ¼, ½ and ¾ if desired as well; too crowded in the graph that
includes confinement, though
plot.plots={'eps':('sigma',)} #,'sigma.50')},'t':('eps')}
#'sigma.25','sigma.50','sigma.75')}
O.saveTmp('initial');
O.timingEnabled=False
global mode
mode='tension' if doModes & 1 else 'compression'
def initTest():
global mode
print("init")
if O.iter>0:
O.wait();
O.loadTmp('initial')
print("Reversing plot data"); plot.reverseData()
else: plot.plot(subPlots=False)
strainer.strainRate=abs(strainRateTension) if mode=='tension' else
-abs(strainRateCompression)
try:
from yade import qt
renderer=qt.Renderer()
renderer.dispScale=(1000,1000,1000) if mode=='tension' else
(100,100,100)
except ImportError: pass
print("init done, will now run.")
O.step(); # to create initial contacts
# now reset the interaction radius and go ahead
ss2sc.interactionDetectionFactor=1.
is2aabb.aabbEnlargeFactor=1.
O.run()
def stopIfDamaged():
global mode
if O.iter<2 or 'sigma' not in plot.data: return # do nothing at the
very beginning
sigma,eps=plot.data['sigma'],plot.data['eps']
extremum=max(sigma) if (strainer.strainRate>0) else min(sigma)
minMaxRatio=0.5 if mode=='tension' else 0.5
if extremum==0: return
import sys; sys.stdout.flush()
if abs(sigma[-1]/extremum)<minMaxRatio or abs(strainer.strain)>(5e-3 if
isoPrestress==0 else 5e-2):
if mode=='tension' and doModes & 2: # only if compression is
enabled
mode='compression'
O.save('/tmp/uniax-tension.yade.gz')
print("Saved /tmp/uniax-tension.yade.gz (for use with
interaction-histogram.py and uniax-post.py)")
print("Damaged, switching to compression... ");
O.pause()
# important! initTest must be launched in a separate
thread;
# otherwise O.load would wait for the iteration to
finish,
# but it would wait for initTest to return and deadlock
would result
import _thread; _thread.start_new_thread(initTest,())
return
else:
print("Damaged, stopping.")
ft,fc=max(sigma),min(sigma)
if doModes==3:
print('Strengths fc=%g, ft=%g,
|fc/ft|=%g'%(fc,ft,abs(fc/ft)))
if doModes==2:
print('Compressive strength fc=%g'%(abs(fc)))
if doModes==1:
print('Tensile strength ft=%g'%(abs(ft)))
title=O.tags['description'] if 'description' in
list(O.tags.keys()) else O.tags['params']
print('gnuplot',plot.saveGnuplot(O.tags['id'],title=title))
print('Bye.')
O.pause()
#sys.exit(0) # results in some threading exception
def addPlotData():
yade.plot.addData({'t':O.time,'i':O.iter,'eps':strainer.strain,'sigma':strainer.avgStress+isoPrestress,
'sigma.25':forcesOnCoordPlane(coord_25,axis)[axis]/area_25+isoPrestress,
'sigma.50':forcesOnCoordPlane(coord_50,axis)[axis]/area_50+isoPrestress,
'sigma.75':forcesOnCoordPlane(coord_75,axis)[axis]/area_75+isoPrestress,
})
plot.plot(subPlots=False)
#O.run()
initTest()
waitIfBatch()
print('gnuplot',plot.saveGnuplot(O.tags['id']))
##find here the parameters table
description sphereRadius
r_75 .75e-3
r_80 .80e-3
r_85 .85e-3
r_90 .90e-3
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