Question #695432 on Yade changed:
https://answers.launchpad.net/yade/+question/695432
chanaka Udaya posted a new comment:
Hi,
Please see this code-->
from __future__ import print_function
################################################################################
#
# Triaxial test. Axial strain rate is prescribed and transverse prestress.
# Test is possible on prism or cylinder
# An independent c++ engine may be created from this script in the future.
#
################################################################################
from builtins import range
from yade import pack, plot
import os
# default parameters or from table
readParamsFromTable(noTableOk=True,
# type of test ['cyl','cube']
testType = 'cyl',
# material parameters
young = 20e9,
poisson = .2,
frictionAngle = 1.2,
sigmaT = 1.5e6,
epsCrackOnset = 1e-4,
relDuctility = 30,
# prestress
preStress = -3e6,
# axial strain rate
strainRate = -100,
# assamlby parameters
rParticle = .075e-3, #
width = 2e-3,
height = 5e-3,
bcCoeff = 5,
# facets division
nw = 24,
nh = 15,
# output specifications
fileName = 'test',
exportDir = '/tmp',
runGnuplot = False,
runInGui = True,
)
from yade.params.table import *
assert testType in ['cyl','cube']
# materials
concMat = O.materials.append(CpmMat(
young=young,frictionAngle=frictionAngle,poisson=poisson,sigmaT=sigmaT,
epsCrackOnset=epsCrackOnset,relDuctility=relDuctility
))
frictMat = O.materials.append(FrictMat(
young=young,poisson=poisson,frictionAngle=frictionAngle
))
# spheres
pred = pack.inCylinder((0,0,0),(0,0,height),.5*width) if testType=='cyl' else
pack.inAlignedBox((-.5*width,-.5*width,0),(.5*width,.5*width,height)) if
testType=='cube' else None
sp=SpherePack()
sp =
pack.randomDensePack(pred,spheresInCell=2000,radius=rParticle,memoizeDb='/tmp/triaxTestOnCylinder.sqlite',returnSpherePack=True)
spheres=sp.toSimulation(color=(0,1,1),material=concMat)
# bottom and top of specimen. Will have prescribed velocity
bot = [O.bodies[s] for s in spheres if
O.bodies[s].state.pos[2]<rParticle*bcCoeff]
top = [O.bodies[s] for s in spheres if
O.bodies[s].state.pos[2]>height-rParticle*bcCoeff]
vel = strainRate*(height-rParticle*2*bcCoeff)
for s in bot:
s.shape.color = (1,0,0)
s.state.blockedDOFs = 'xyzXYZ'
s.state.vel = (0,0,-vel)
for s in top:
s.shape.color = Vector3(0,1,0)
s.state.blockedDOFs = 'xyzXYZ'
s.state.vel = (0,0,vel)
# facets
facets = []
if testType == 'cyl':
rCyl2 = .5*width / cos(pi/float(nw))
for r in range(nw):
for h in range(nh):
v1 = Vector3( rCyl2*cos(2*pi*(r+0)/float(nw)),
rCyl2*sin(2*pi*(r+0)/float(nw)), height*(h+0)/float(nh) )
v2 = Vector3( rCyl2*cos(2*pi*(r+1)/float(nw)),
rCyl2*sin(2*pi*(r+1)/float(nw)), height*(h+0)/float(nh) )
v3 = Vector3( rCyl2*cos(2*pi*(r+1)/float(nw)),
rCyl2*sin(2*pi*(r+1)/float(nw)), height*(h+1)/float(nh) )
v4 = Vector3( rCyl2*cos(2*pi*(r+0)/float(nw)),
rCyl2*sin(2*pi*(r+0)/float(nw)), height*(h+1)/float(nh) )
f1 = facet((v1,v2,v3),color=(0,0,1),material=frictMat)
f2 = facet((v1,v3,v4),color=(0,0,1),material=frictMat)
facets.extend((f1,f2))
elif testType == 'cube':
nw2 = nw/4
for r in range(nw2):
for h in range(nh):
v11 = Vector3( -.5*width + (r+0)*width/nw2, -.5*width,
height*(h+0)/float(nh) )
v12 = Vector3( -.5*width + (r+1)*width/nw2, -.5*width,
height*(h+0)/float(nh) )
v13 = Vector3( -.5*width + (r+1)*width/nw2, -.5*width,
height*(h+1)/float(nh) )
v14 = Vector3( -.5*width + (r+0)*width/nw2, -.5*width,
height*(h+1)/float(nh) )
f11 =
facet((v11,v12,v13),color=(0,0,1),material=frictMat)
f12 =
facet((v11,v13,v14),color=(0,0,1),material=frictMat)
v21 = Vector3( +.5*width, -.5*width + (r+0)*width/nw2,
height*(h+0)/float(nh) )
v22 = Vector3( +.5*width, -.5*width + (r+1)*width/nw2,
height*(h+0)/float(nh) )
v23 = Vector3( +.5*width, -.5*width + (r+1)*width/nw2,
height*(h+1)/float(nh) )
v24 = Vector3( +.5*width, -.5*width + (r+0)*width/nw2,
height*(h+1)/float(nh) )
f21 =
facet((v21,v22,v23),color=(0,0,1),material=frictMat)
f22 =
facet((v21,v23,v24),color=(0,0,1),material=frictMat)
v31 = Vector3( +.5*width - (r+0)*width/nw2, +.5*width,
height*(h+0)/float(nh) )
v32 = Vector3( +.5*width - (r+1)*width/nw2, +.5*width,
height*(h+0)/float(nh) )
v33 = Vector3( +.5*width - (r+1)*width/nw2, +.5*width,
height*(h+1)/float(nh) )
v34 = Vector3( +.5*width - (r+0)*width/nw2, +.5*width,
height*(h+1)/float(nh) )
f31 =
facet((v31,v32,v33),color=(0,0,1),material=frictMat)
f32 =
facet((v31,v33,v34),color=(0,0,1),material=frictMat)
v41 = Vector3( -.5*width, +.5*width - (r+0)*width/nw2,
height*(h+0)/float(nh) )
v42 = Vector3( -.5*width, +.5*width - (r+1)*width/nw2,
height*(h+0)/float(nh) )
v43 = Vector3( -.5*width, +.5*width - (r+1)*width/nw2,
height*(h+1)/float(nh) )
v44 = Vector3( -.5*width, +.5*width - (r+0)*width/nw2,
height*(h+1)/float(nh) )
f41 =
facet((v41,v42,v43),color=(0,0,1),material=frictMat)
f42 =
facet((v41,v43,v44),color=(0,0,1),material=frictMat)
facets.extend((f11,f12,f21,f22,f31,f32,f41,f42))
O.bodies.append(facets)
mass = O.bodies[0].state.mass
for f in facets:
f.state.mass = mass
f.state.blockedDOFs = 'XYZz'
# plots
plot.plots = { 'e':('s',), }
def plotAddData():
f1 = sum(O.forces.f(b.id)[2] for b in top)
f2 = sum(O.forces.f(b.id)[2] for b in bot)
f = .5*(f2-f1)
s = f/(pi*.25*width*width) if testType=='cyl' else f/(width*width) if
testType=='cube' else None
e = (top[0].state.displ()[2] - bot[0].state.displ()[2]) /
(height-rParticle*2*bcCoeff)
plot.addData(
i = O.iter,
s = s,
e = e,
)
# apply prestress to facets
def addForces():
for f in facets:
n = f.shape.normal
a = f.shape.area
O.forces.addF(f.id,preStress*a*n)
# stop condition and exit of the simulation
def stopIfDamaged(maxEps=5e-3):
extremum = max(abs(s) for s in plot.data['s'])
s = abs(plot.data['s'][-1])
e = abs(plot.data['e'][-1])
if O.iter < 1000 or s > .5*extremum and e < maxEps:
return
f = os.path.join(exportDir,fileName)
print('gnuplot',plot.saveGnuplot(f,term='png'))
if runGnuplot:
import subprocess
os.chdir(exportDir)
subprocess.Popen(['gnuplot',f+'.gnuplot']).wait()
print('Simulation finished')
O.pause()
#sys.exit(0) # results in some threading exception
O.dt=.5*utils.PWaveTimeStep()
enlargeFactor=1.5
O.engines=[
ForceResetter(),
InsertionSortCollider([
Bo1_Sphere_Aabb(aabbEnlargeFactor=enlargeFactor,label='bo1s'),
Bo1_Facet_Aabb()
]),
InteractionLoop(
[
Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=enlargeFactor,label='ss2d3dg'),
Ig2_Facet_Sphere_ScGeom(),
],
[
Ip2_CpmMat_CpmMat_CpmPhys(cohesiveThresholdIter=O.iter+5),
Ip2_FrictMat_CpmMat_FrictPhys(),
Ip2_FrictMat_FrictMat_FrictPhys(),
],
[
Law2_ScGeom_CpmPhys_Cpm(),
Law2_ScGeom_FrictPhys_CundallStrack(),
],
),
PyRunner(iterPeriod=1,command="addForces()"),
NewtonIntegrator(damping=.3),
CpmStateUpdater(iterPeriod=50,label='cpmStateUpdater'),
PyRunner(command='plotAddData()',iterPeriod=10),
PyRunner(iterPeriod=50,command='stopIfDamaged()'),
]
# run one step
O.step()
# reset interaction detection enlargement
bo1s.aabbEnlargeFactor=ss2d3dg.interactionDetectionFactor=1.0
# initialize auto-updated plot
if runInGui:
plot.plot()
try:
from yade import qt
renderer=qt.Renderer()
# uncomment following line to exagerate displacement
#renderer.dispScale=(100,100,100)
except:
pass
# run
O.run()
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