Yade

material in PeriTriaxController

Asked by fengjingyu

Hi,

I just added a line of code about the material and didn't use it when generating the cloud.But I found that the results changed. Why is that?

I've tried to generate default material in the cloud ( FrictMat(density=2e3,young=30e9,poisson=.3,frictionAngle=.5236)).But we can't get to the first stable state.

Thanks,

Feng

####################################
# encoding: utf-8

sigmaIso=-25000

idSteel=O.materials.append(FrictMat(young=210e9,poisson=.25,frictionAngle=.8,label="steel"))

from yade import pack, qt, plot

O.periodic=True

sp=pack.SpherePack()
sp.makeCloud((0,0,0),(2,2,2),rMean=.1,rRelFuzz=.3,periodic=True)
#sp.toSimulation(material='sphereMat')
sp.toSimulation()

O.engines=[
   ForceResetter(),
   InsertionSortCollider([Bo1_Sphere_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=(10,10,10),
      maxUnbalanced=.1,relStressTol=1e-3,
      doneHook='compactionFinished()'
   ),
   NewtonIntegrator(damping=.2),
   PyRunner(command='addPlotData()',iterPeriod=100),
]
O.dt=.5*PWaveTimeStep()

def addPlotData():
    plot.addData(x=triax.stress[0],y=triax.stress[1],z=triax.stress[2],
  a=triax.strain[0],b=triax.strain[1],c=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,
                k=(triax.stress[0]*0.5+triax.stress[1]*0.5)/triax.stress[2]
 )
 print(triax.stress[2],triax.strain[2])
 plot.saveDataTxt('kz2.txt',vars=('k','z','c'))

def compactionFinished():
   O.cell.trsf=Matrix3.Identity
   triax.goal=(sigmaIso,sigmaIso,-.5)
   triax.stressMask=3
   triax.maxStrainRate=(0,0,.1)
   triax.doneHook='triaxFinished()'
   triax.maxUnbalanced=10

def triaxFinished():
   print 'Finished'
   O.pause()

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Chareyre
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Revision history for this message
Best Chareyre (bruno-chareyre-9) said : 		#1

Hi, last inserted material is used by default, as you just found.

Le sam. 19 janv. 2019 11:32, fengjingyu <
<email address hidden>> a écrit :

> New question #677931 on Yade:
> https://answers.launchpad.net/yade/+question/677931
>
> Hi,
>
> I just added a line of code about the material and didn't use it when
> generating the cloud.But I found that the results changed. Why is that?
>
> I've tried to generate default material in the cloud (
> FrictMat(density=2e3,young=30e9,poisson=.3,frictionAngle=.5236)).But we
> can't get to the first stable state.
>
> Thanks,
>
> Feng
>
> ####################################
> # encoding: utf-8
>
> sigmaIso=-25000
>
>
> idSteel=O.materials.append(FrictMat(young=210e9,poisson=.25,frictionAngle=.8,label="steel"))
>
> from yade import pack, qt, plot
>
> O.periodic=True
>
> sp=pack.SpherePack()
> sp.makeCloud((0,0,0),(2,2,2),rMean=.1,rRelFuzz=.3,periodic=True)
> #sp.toSimulation(material='sphereMat')
> sp.toSimulation()
>
> O.engines=[
> ForceResetter(),
> InsertionSortCollider([Bo1_Sphere_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=(10,10,10),
> maxUnbalanced=.1,relStressTol=1e-3,
> doneHook='compactionFinished()'
> ),
> NewtonIntegrator(damping=.2),
> PyRunner(command='addPlotData()',iterPeriod=100),
> ]
> O.dt=.5*PWaveTimeStep()
>
> def addPlotData():
> plot.addData(x=triax.stress[0],y=triax.stress[1],z=triax.stress[2],
> a=triax.strain[0],b=triax.strain[1],c=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,
>
> k=(triax.stress[0]*0.5+triax.stress[1]*0.5)/triax.stress[2]
> )
> print(triax.stress[2],triax.strain[2])
> plot.saveDataTxt('kz2.txt',vars=('k','z','c'))
>
> def compactionFinished():
> O.cell.trsf=Matrix3.Identity
> triax.goal=(sigmaIso,sigmaIso,-.5)
> triax.stressMask=3
> triax.maxStrainRate=(0,0,.1)
> triax.doneHook='triaxFinished()'
> triax.maxUnbalanced=10
>
> def triaxFinished():
> print 'Finished'
> O.pause()
>
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Revision history for this message
fengjingyu (fengjing) said : 		#2

Thanks Chareyre, that solved my question.