Question #688652 on Yade changed:
https://answers.launchpad.net/yade/+question/688652
Status: Solved => Open
Mumić is still having a problem:
Hello everyone,
I have managed to plot vary the values as described on my last post but
now I face another problem: "yade" and "yade-batch" yield different
results.
When I compute Poisson modulus with batch, the values obtained are akin
to those found on Šmilauer's thesis, but if I run the simulations
manually the values will differ.
My script can be found below:
###############################################
#!/usr/bin/python
# -*- coding: utf-8 -*-
from yade import plot,pack,timing
import time, sys, os, copy, numpy as np
savedir = './elastic_validation/'
# default parameters or from table
readParamsFromTable(
young = 66e9,
poisson = 0.1,
sigmaT=1e99,
#frictionAngle=atan(0.8),
epsCrackOnset=1e99,
relDuctility=1e99,
intRadius=1.5,
dtSafety=.1,
damping=0.8,
strainRateTension=.005,
strainRateCompression=.5,
setSpeeds=True,
# 1=tension, 2=compression (ANDed; 3=both)
doModes=1,
specimenLength=.039850,
specimenRadius=.019875,
sphereRadius=0.75e-3,
# isotropic confinement (should be negative)
isoPrestress=0,
noTableOk=True,
n=100
)
from yade.params.table import *
if 'description' in list(O.tags.keys()):
O.tags['id']=O.tags['id']+O.tags['description']
print(young, poisson)
# make geom; the dimensions are hard-coded here; could be in param table if
desired
# z-oriented hyperboloid, length 20cm, diameter 10cm, skirt 8cm
# using spheres 7mm of diameter
concreteId=O.materials.append(
CpmMat(
young=young,
#frictionAngle=frictionAngle,
poisson=poisson,
density=6420,
sigmaT=sigmaT,
relDuctility=relDuctility,
epsCrackOnset=epsCrackOnset,
#isoPrestress=isoPrestress,
neverDamage=True,
)
)
#sps=SpherePack()
#sp=pack.randomDensePack(pack.inAlignedBox((0,0,0),(specimenLength,specimenLength,specimenLength)),
sp=pack.randomDensePack(pack.inCylinder((0,0,-.5*specimenLength),(0,0,.5*specimenLength),specimenRadius),
spheresInCell=5000,
radius=sphereRadius,
memoizeDb='/tmp/calibCylinder3.sqlite',
returnSpherePack=True)
sp.toSimulation(material=concreteId)
def getElementsCurrentPosition():
return np.array(list(map(lambda x: [x.state.pos[0], x.state.pos[1],
x.state.pos[2], x.id], O.bodies)))
ibpos = getElementsCurrentPosition()
def fetchElements(pos=(0,0,0), n=1):
pos = np.array(pos)
distances = np.sum(ibpos[:,:3]-pos, axis=1)**2
return ibpos[distances.argsort()][:n,3].tolist()
def computePosition(n=1):
elements = np.array(fetchElements(n=n)).astype(int)
current_position = getElementsCurrentPosition()
return current_position[elements]
allpos = computePosition(n)
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()]
imm, imx = mm, mx
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),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=intRadius,label='ss2sc')],
[Ip2_CpmMat_CpmMat_CpmPhys()],
[Law2_ScGeom_CpmPhys_Cpm()],
),
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=1,command='stopIfDamaged()',label='damageChecker'),
]
# 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, allpos, alldisp
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']
allpos = np.append(allpos, computePosition(n), 1)
print(allpos.shape)
extremum=max(sigma) if (strainer.strainRate>0) else min(sigma)
minMaxRatio=0.8 if mode=='tension' else 0.8
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) or O.iter>5000:
if mode=='tension' and doModes & 2: # only if compression is
enabled
numpy.savetxt(savedir+str(young)+' '+str(poisson)+'
1.txt', numpy.array([sigma, eps]).T, header='sigma\teps', delimiter='\t')
numpy.savetxt(savedir+str(young)+' '+str(poisson)+'
3.txt', allpos, delimiter='\t')
with open('./uniax.py', 'r') as f1:
text = f1.read()
with open(savedir+str(young)+'
'+str(poisson)+'.py', 'w') as f2:
f2.write(text)
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:
numpy.savetxt(savedir+str(young)+' '+str(poisson)+'
2.txt', numpy.array([sigma, eps]).T, header='sigma\teps', delimiter='\t')
numpy.savetxt(savedir+str(young)+' '+str(poisson)+'
4.txt', allpos, delimiter='\t')
with open('./uniax.py', 'r') as f1:
text = f1.read()
with open(savedir+str(young)+'
'+str(poisson)+'.py', 'w') as f2:
f2.write(text)
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('Bye.')
O.pause()
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,
})
initTest()
waitIfBatch()
###############################################
if you run this code on 'yade', it'll yield the poisson value of
0.16531931 but if I run it on 'yade-batch' the obtained value is
0.23966927.
Is there a cause for this difference, since the parameters are the same?
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