Question #462863 on Yade changed:
https://answers.launchpad.net/yade/+question/462863
Seti gave more information on the question:
for example below script will work for
sigmaIsoCompaction=-150e3,
sigmaLateralConfinement=-150e3,
if I change the to 50e3 results are not make sense ( much lower that
experimental results)
# encoding: utf-8
# 2012 ©Bruno Chareyre <[email protected]>
# This variant of triax-basic.py shows the usage of cohesive contact laws and
moments at contacts
from yade import pack
sp=pack.SpherePack()
## corners of the initial packing
mn,mx=Vector3(0,0,0),Vector3(10,10,10)
## box between mn and mx, avg radius ± ½(20%), 2k spheres
sp.makeCloud(minCorner=mn,maxCorner=mx,rRelFuzz=.2,num=1000)
## create material #0, which will be used as default
O.materials.append(CohFrictMat(young=229e6,poisson=0.4,density=2600,frictionAngle=radians(36.5),normalCohesion=1e6,shearCohesion=1e6,momentRotationLaw=True,etaRoll=0.14,label='spheres'))
O.materials.append(FrictMat(young=229e6,poisson=.4,frictionAngle=0,density=0,label='frictionlessWalls'))
## copy spheres from the packing into the scene
O.bodies.append([sphere(center,rad,material='spheres') for center,rad in sp])
## create walls around the packing
walls=aabbWalls(material='frictionlessWalls')
wallIds=O.bodies.append(walls)
triax=TriaxialCompressionEngine(
wall_bottom_id=wallIds[2],
wall_top_id=wallIds[3],
wall_left_id=wallIds[0],
wall_right_id=wallIds[1],
wall_back_id=wallIds[4],
wall_front_id=wallIds[5],
internalCompaction=False,
sigmaIsoCompaction=-50e3,
sigmaLateralConfinement=-50e3,
max_vel=10,
strainRate=0.03,
label="triax"
)
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(),Bo1_Box_Aabb()]),
InteractionLoop(
#box-sphere interactions will be the simple normal-shear law,
we use ScGeom for them
[Ig2_Sphere_Sphere_ScGeom6D(),Ig2_Box_Sphere_ScGeom()],
#Boxes will be frictional (FrictMat), so the sphere-box physics
is FrictMat vs. CohFrictMat, the Ip type will be found via the inheritance tree
(CohFrictMat is a FrictMat) and will result in FrictPhys interaction physics
#and will result in a FrictPhys
[Ip2_FrictMat_FrictMat_FrictPhys(),Ip2_CohFrictMat_CohFrictMat_CohFrictPhys(label="cohesiveIp")],
#Finally, two different contact laws for sphere-box and
sphere-sphere
[Law2_ScGeom_FrictPhys_CundallStrack(),Law2_ScGeom6D_CohFrictPhys_CohesionMoment(
useIncrementalForm=True, #useIncrementalForm is turned
on as we want plasticity on the contact moments
always_use_moment_law=False, #if we want "rolling"
friction even if the contact is not cohesive (or cohesion is broken), we will
have to turn this true somewhere
label='cohesiveLaw')]
),
GlobalStiffnessTimeStepper(active=1,timeStepUpdateInterval=100,timestepSafetyCoefficient=0.5),
triax,
TriaxialStateRecorder(iterPeriod=100,file='50e3,young=229e6,poisson=0.4,density=2600,frictionAngle=radians(36.5),normalCohesion=1e6,shearCohesion=1e6,etaRoll=0.14,'),
NewtonIntegrator(damping=.4)
]
from yade import plot
O.engines=O.engines[0:5]+[PyRunner(iterPeriod=20,command='history()',label='recorder')]+O.engines[5:7]
def history():
plot.addData(e11=-O.engines[4].strain[0], e22=-O.engines[4].strain[1],
e33=-O.engines[4].strain[2],
s11=-O.engines[4].stress(0)[0],
s22=-O.engines[4].stress(2)[1],
s33=-O.engines[4].stress(4)[2],
i=O.iter)
#plot.plots={'i':(('e11',"bo"),('e22',"ro"),('e33',"go"),None,('s11',"bx"),('s22',"rx"),('s33',"gx"))}
plot.plots={'e22':'s22'}
plot.plot()
print "computing, be patient..."
#First run without moment and without cohesion
O.run(20000,True)
#This will reload the autosaved compacted sample
O.reload()
#second run with rolling friction
O.engines[2].lawDispatcher.functors[1].always_use_moment_law = True
O.run(20000,True)
O.reload()
#third run with rolling friction + cohesion
O.engines[2].lawDispatcher.functors[1].always_use_moment_law = True
#We assign cohesion to all contacts at the next iteration
O.engines[2].physDispatcher.functors[1].setCohesionNow = True
O.run(30000,True)
Thanks for help
seti
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