New question #678348 on Yade:
https://answers.launchpad.net/yade/+question/678348
Hi，
I do isotropic compression at first, and then I do one-dimensional
compression.I get stress and strain in real time.
I found that if I used the default material, everything would be fine. In a
one-dimensional compression, the pressure slowly increases.But when I use my
own definition of the material, in one-dimensional compression, the pressure
goes down and then goes up.I have not made any changes to the code except for
the addition of material=spheres when generating the particles.
Please tell me exactly where I made a mistake.Run my code if you can.
Thanks，
James
#####################################
# encoding: utf-8
sigmaIso=-25000
from yade import pack, qt, plot
O.periodic=True
spheres=O.materials.append(FrictMat(young=64e9,poisson=0.12,density=2650,frictionAngle=0.0005))
sp=pack.SpherePack()
sp.makeCloud((0,0,0),(1,1,1),rMean=.1,rRelFuzz=.3,periodic=True)
sp.toSimulation(material=spheres)
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Facet_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]
),
PeriTriaxController(label='triax',
goal=(sigmaIso,sigmaIso,sigmaIso),stressMask=7,
dynCell=True,maxStrainRate=(.1,.1,.1),
maxUnbalanced=.1,relStressTol=1e-3,
doneHook='compactionFinished()'
),
NewtonIntegrator(damping=.1),
PyRunner(command='addPlotData()',iterPeriod=1000),
]
O.dt=.5*PWaveTimeStep()
def addPlotData():
plot.addData(sxx=triax.stress[0],syy=triax.stress[1],szz=triax.stress[2],
exx=triax.strain[0],eyy=triax.strain[1],ezz=triax.strain[2],
q=triax.stress[2]-0.5*(triax.stress[0]+triax.stress[1]),
p=(triax.stress[0]+triax.stress[1]+triax.stress[2])/3,
)
print('szz=',triax.stress[2],'ezz=',triax.strain[2])
plot.saveDataTxt('qp1.txt',vars=('q','p','szz','ezz'))
def compactionFinished():
print('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa')
O.cell.trsf=Matrix3.Identity
triax.goal=(sigmaIso,sigmaIso,-1000000)
triax.stressMask=7
triax.maxStrainRate=(0,0,.0001)
triax.doneHook='triaxFinished()'
triax.maxUnbalanced=0.000001
def triaxFinished():
print 'Finished'
O.pause()
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