Re: [Yade-users] [Question #656214]: problem replacing TriaxialStressController with PeriTriaxController
Question #656214 on Yade changed: https://answers.launchpad.net/yade/+question/656214 Status: Open => Answered Robert Caulk proposed the following answer: As Jan says[1], increase the maxStrainRate to speed up compression. [1] comment #18 of this thread -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #656214]: problem replacing TriaxialStressController with PeriTriaxController
Question #656214 on Yade changed:
https://answers.launchpad.net/yade/+question/656214
Status: Answered => Open
rhaven is still having a problem:
Hi Robert,
Thank you for the code to check what is happening with the compression.
Ive modified it a bit to run longer. The code is below and the result is below
the code. I see the strain rate value slowly increasing, but this is after 10 *
50,000 steps!
clump1 is :
[(Vector3(5.909274815666576e-8,6.604810944051645e-8,2.2856300690077526e-7),
5.909090909090909e-08),
(Vector3(1.33464963673031e-7,1.3998894180339492e-7,1.114205347590509e-7),
5.727272727272727e-08),
(Vector3(1.010434819522126e-7,1.3355465672055947e-7,3.431244420289289e-7),
5.5454545454545454e-08),
(Vector3(5.682727445722134e-8,6.209460981215949e-8,8.464063183667366e-8),
5.3636363636363635e-08),
(Vector3(1.441769958165514e-7,1.3685605985835674e-7,2.412455564359458e-7),
5.1818181818181817e-08)]
#
from yade import pack
clump1 = makeClump(1)
#minCorner = (0,0,0)
#maxCorner = (1e-6,1e-6,1e-6)
O.resetThisScene()
O.periodic=True
#O.cell.setBox(2e-6,2e-6,2e-6)
O.cell.hSize=Matrix3(1.5e-6, 0, 0, 0 ,1.5e-6, 0, 0, 0, 1.5e-6)
sp=pack.SpherePack()
sp=pack.SpherePack()
#c1=pack.SpherePack([((0,0,0),.1),((.15,0,0),.05),((0,.1,0),.05)])
print clump1
c1 = pack.SpherePack(clump1)
raw_input('Generating Clump Cloud, Press any Key to continue')
#sp.makeClumpCloud(minCorner, maxCorner, [c1], periodic=True, num = 1000)#,
periodic=True, num=-1, seed=1)
sp.makeClumpCloud(Vector3().Zero,O.cell.refSize,[c1],periodic=True)
sp.toSimulation()
#genClumps()
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb()]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom()],
[Ip2_FrictMat_FrictMat_FrictPhys()],
[Law2_ScGeom_FrictPhys_CundallStrack()]
),
#PeriTriaxController(maxUnbalanced=0.01,relStressTol=0.02,goal=[-1e4,-1e4,0],stressMask=3,globUpdate=5,maxStrainRate=[1.,1.,1.],doneHook='triaxDone()',label='triax'),
#using cell inertia
PeriTriaxController(dynCell=True,mass=0.2,maxUnbalanced=0.01,relStressTol=0.02,goal=(-1e6,-1e6,-1e6),stressMask=3,globUpdate=5,maxStrainRate=(1.,1.,1.),doneHook='triaxDone()',label='compressor'),
#PeriTriaxController(dynCell=True,mass=0.2,maxUnbalanced=0.01,relStressTol=0.02,goal=(-1e4,-1e4,0),stressMask=3,globUpdate=5,maxStrainRate=(1e6,1e6,1e6),doneHook='triaxDone()',label='compressor'),
NewtonIntegrator(damping=.2),
]
O.dt=PWaveTimeStep()
raw_input("Pausing for Compression, Press any Key to continue")
#O.run();
for i in range(10):
print('strain: ', compressor.strain)
O.run(5,True)
print('max strain: ', compressor.maxStrainRate)
##
#qt.View()
phase=0
# RESULT
('strain: ', Vector3(0,0,0))
('strain: ',
Vector3(-0.25776189076416675,-0.25776189076416675,-0.25909090915674364))
('strain: ',
Vector3(-0.5168527999089578,-0.5168527999089578,-0.5181818183147237))
('strain: ',
Vector3(-0.7759437090450382,-0.7759437090450382,-0.7772727274642117))
('strain: ',
Vector3(-0.00010350346181927866,-0.00010350346181927866,-0.00010363636366289179))
('strain: ',
Vector3(-0.000129412552734705,-0.000129412552734705,-0.00012954545457970272))
('strain: ',
Vector3(-0.0001553216436504901,-0.0001553216436504901,-0.00015545454549700528))
('strain: ',
Vector3(-0.00018123073456645253,-0.00018123073456645253,-0.0001813636364147292))
('strain: ',
Vector3(-0.00020713982548285556,-0.00020713982548285556,-0.00020727272732947322))
('strain: ',
Vector3(-0.00023304891639974086,-0.00023304891639974086,-0.0002331818182436108))
('max strain: ', Vector3(1,1,1))
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Re: [Yade-users] [Question #656214]: problem replacing TriaxialStressController with PeriTriaxController
Question #656214 on Yade changed: https://answers.launchpad.net/yade/+question/656214 Status: Open => Answered Jan Stránský proposed the following answer: Hello, > PeriTriaxController no longer runs (periodic spheres are added but spheres are not compressed). always try to get numerical evidence of such statements, do not make judgments from visual observing. In this case, you can simply try ## for i in range(10): print compressor.strain O.run(1000,True) ## to see that the strain is constantly increasing. If you add "print compressor.strainRate" and compare it to compressor.maxStrainRate, the reason for "no longer runs" and "are not compress" pops out. I added "maxStrainRate=(1e6,1e6,1e6)" argument to PeriTriaxController and see the cell being compressed. cheers Jan -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #656214]: problem replacing TriaxialStressController with PeriTriaxController
Question #656214 on Yade changed: https://answers.launchpad.net/yade/+question/656214 Status: Answered => Open rhaven is still having a problem: Hi Robert, I ran your script and indeed it runs fine. I then merged in my clump generation script and the PeriTriaxController no longer runs (periodic spheres are added but spheres are not compressed). I have updated yadedaily just in case, but to no avail. I am thinking that one reason peritriaxcontroller is not compressing the clumps could be due to some of the spheres from my generated clumps overlapping. Could this be the case? thank you Jesse -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #656614]: Sphere size Distribution
Question #656614 on Yade changed: https://answers.launchpad.net/yade/+question/656614 Seti posted a new comment: Hi Jan, Much appreciated :) -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #656614]: Sphere size Distribution
Question #656614 on Yade changed: https://answers.launchpad.net/yade/+question/656614 Status: Answered => Solved Seti confirmed that the question is solved: Thanks Jan Stránský, that solved my question. -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
Re: [Yade-users] [Question #655866]: Rel. to Uniaxial test
Question #655866 on Yade changed: https://answers.launchpad.net/yade/+question/655866 Jan Stránský proposed the following answer: Hello, read [1] You can start yade simply by "yade", opening yade prompt and allowing you to type commands Or you can pass a script name as an command line argument. so instead of yade yade script1.py # this one already inside yade just run (see [1] for details) yade script1.py cheers Jan [1] https://yade-dem.org/doc/tutorial-hands-on.html -- You received this question notification because your team yade-users is an answer contact for Yade. ___ Mailing list: https://launchpad.net/~yade-users Post to : yade-users@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-users More help : https://help.launchpad.net/ListHelp
[Yade-users] [Question #656657]: tension test on grids
New question #656657 on Yade:
https://answers.launchpad.net/yade/+question/656657
Hello,
I am trying to write a tension test script on a grid, so i can calibrate my
grid parameters,
My script is based on the example :
trunk/examples/grids/CohesiveGridConnectionSphere.py
The problem is that the velocity is applied instantly not permanently, so the
force in my grid go through an oscillation once the velocity is applied, even
if the iterperiod is set to 1,
The tension force in my grid does not cumulate; it goes through the same value
and then return to the initial state for every velocity application,
Therefore, I cannot reach the rupture state,
Anyone can help my with this problem?
This is my script,
# materials properties
O.materials.append(CohFrictMat(young=20e5,poisson=0.3,density=3e2,frictionAngle=radians(10),normalCohesion=8.5e6,shearCohesion=8.5e6,momentRotationLaw=True,label='spheremat'))
# functions and laws
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_GridConnection_Aabb()]),
InteractionLoop([Ig2_GridNode_GridNode_GridNodeGeom6D()],
[Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(setCohesionNow=True,setCohesionOnNewContacts=False)],
[Law2_ScGeom6D_CohFrictPhys_CohesionMoment()]),
GlobalStiffnessTimeStepper(timestepSafetyCoefficient=0.7),
NewtonIntegrator(gravity=(0,0,-10),damping=0.9,label='newton'),
PyRunner(command='history1()',iterPeriod=100,label='recorder',dead=True),
PyRunner(iterPeriod=20,command='myAddPlotData()',label='recorder1',dead=True)
]
L=0.6 #length[m]
l=0.21 #width[m]
nbL=21
nbl=8
r=0.006
nodesIds=[]
color=[255./255.,102./255.,0./255.]
for i in range(0,nbL):
for j in range(0,nbl):
nodesIds.append(O.bodies.append(gridNode([0,j*l/(nbl-1),-i*L/(nbL-1)],r,wire=False,fixed=False,material='spheremat',color=color)))
#Create connection between the nodes
for i in range(0,len(nodesIds)):
for j in range(i+1,len(nodesIds)):
dist=(O.bodies[i].state.pos - O.bodies[j].state.pos).norm()
if(dist<=(L/(nbL-1))*1.01):
O.bodies.append(gridConnection(i,j,r,color=color))
#nodes fixe :
for i in range (0,72):
O.bodies[i].state.blockedDOFs='xyzXYZ'
#apply the tension force :
def history1():
global Fn,Ft
if O.iter>5000:
for i in range (len(nodesIds)-72,len(nodesIds)):
O.bodies[i].state.dynamic=False
O.bodies[i].state.vel[2]=-0.0002
plot.plots={'epz':('Fz')}
#plot tension force in grid :
def myAddPlotData():
F=(abs(O.forces.f(64)[2])+abs(O.forces.f(65)[2])+abs(O.forces.f(66)[2])+abs(O.forces.f(67)[2])+abs(O.forces.f(68)[2])+abs(O.forces.f(69)[2])+abs(O.forces.f(70)[2])+abs(O.forces.f(71)[2]))/(210)
s1=O.bodies[68]
s2=O.bodies[100]
ep=((s2.state.pos-s1.state.pos).norm()-(4*0.03))*100/(4*0.03)
plot.addData(Fz=F,epz=ep)
#plot.saveDataTxt('dataFile.txt.bz2',vars=('Fz','epz'))
plot.plot()
recorder.dead=False
recorder1.dead=False
O.run(10,True)
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Re: [Yade-users] [Question #655866]: Rel. to Uniaxial test
Question #655866 on Yade changed:
https://answers.launchpad.net/yade/+question/655866
Swapnil posted a new comment:
Here is the script Jan:
from yade import pack,plot
pred=pack.inCylinder((0,0,0),(0,0,0.2),0.05)
sp=pack.randomDensePack(pred,radius=0.008)
O.bodies.append(sp)
bb=uniaxialTestFeatures()
negIds,posIds,crossSectionArea=bb['negIds'],bb['posIds'],bb['axis'],bb['area']
O.dt=0.005*PWaveTimeStep()
O.engines=[ForceResetter(),InsertionSortCollider([Bo1_Sphere_Aabb()]),InteractionLoop([Ig2_Sphere_Sphere_ScGeom()],[Ip2_FrictMat_FrictMat_FrictPhys()],[Law2_ScGeom_FrictPhys_CundallStrack()]),NewtonIntegrator(),UniaxialStrainer(strainRate=-0.5,axis=axis,asymmetry=0,posIds=posIds,negIds=negIds,crossSectionArea=crossSectionArea,blockDisplacements=False,blockRotations=False,setSpeeds=False,label='strainer'),PyRunner(virtPeriod=1e-6/0.5,realPeriod=1,command='addPlotData()',label='plotDataCollector',initRun=True)]
plot.plots={'eps':('sigma')}
def addPlotData():
yade.plot.addData(t=O.time,i=O.iter,eps=-strainer.strain,sigma=-strainer.avgStress)
O.run(10,True)
---
saved as file script1.py. I am typing "yade script1.py" in the terminal and I
get the following error:
File "", line 1
yade script1.py
^
SyntaxError: invalid syntax
---
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