triaxial test with CohFrictMat
Hello everybody when I run this triaxial test code In the case where setCohesionNow=True
I get this error terminate called after throwing an instance of 'std::runtime_
what(): Undefined or ambiguous IPhys dispatch for types FrictMat and CohFrictMat.(core dump)
Please guide me.
from yade import pack
#######
### DEFINING VARIABLES AND MATERIALS ###
#######
# The following 5 lines will be used later for batch execution
nRead=readParam
num_spheres=1000,# number of spheres
compFricDegree = 30, # contact friction during the confining phase
key='_
unknownOk=True
)
from yade.params import table
num_spheres=
key=table.key
targetPorosity = 0.34#the porosity we want for the packing
compFricDegree = table.compFricD
finalFricDegree = 30 # contact friction during the deviatoric loading
rate=-0.02 # loading rate (strain rate)
damp=0.2 # damping coefficient
stabilityThresh
young=5e6 # contact stiffness
mn,mx=Vector3(
## create materials for spheres and trash
O.materials.
O.materials.
isCohesive=
normalCohes
shearCohesi
))
O.materials.
## create walls around the packing
walls=aabbWalls
wallIds=
## use a SpherePack object to generate a random loose particles packing
sp=pack.
spSmall = pack.SpherePack()
spBig = pack.SpherePack()
sp.makeCloud(
for ss in sp: #split SpherePack into two other packs based on the particle size
r = ss[1]
if r > .05/2:# please note that you feed diameters nor radii in psdSizes, that is why I divide it by 2
spBig.
else:
spSmall.
# add only the spheres that you want to replace and replace them with clump1
spSmall.
ct1 = clumpTemplate(
O.bodies.
for b in O.bodies:
if b.isClumpMember: b.shape.
####product trash#####
a=[0,.005,
b=[0,.005,
c=[.005]
d=[]
e=[.005]
g=e*128
for i in a:
for j in b:
for k in c:
d.append(
#add the remaining spheres stored in the other sphere pack
spBig.toSimulat
ct2 = clumpTemplate(g,d)
aa=O.bodies.
for ii in aa:
xx=ii[1]
for jj in xx:
O.bodies[
#O.dt = 0
#O.step()
#for i in O.interactions:
#i.phys.unp = i.geom.
#######
### DEFINING ENGINES ###
#######
triax=TriaxialS
## TriaxialStressC
## this control of boundary conditions was used for instance in http://
maxMultiplier=
finalMaxMultip
thickness = 0,
## switch stress/strain control using a bitmask. What is a bitmask, huh?!
## Say x=1 if stess is controlled on x, else x=0. Same for for y and z, which are 1 or 0.
## Then an integer uniquely defining the combination of all these tests is: mask = x*1 + y*2 + z*4
## to put it differently, the mask is the integer whose binary representation is xyz, i.e.
## "100" (1) means "x", "110" (3) means "x and y", "111" (7) means "x and y and z", etc.
stressMask = 7,
internalCompac
)
newton=
O.engines=[
ForceResetter(),
InsertionSortC
InteractionLoop(
[Ig2_
[Ip2_
)],
),
## We will use the global stiffness of each body to determine an optimal timestep (see https:/
GlobalStiffnes
triax,
TriaxialStateR
newton
]
#Display spheres with 2 colors for seeing rotations better
Gl1_Sphere.
if nRead==0: yade.qt.
#######
### APPLYING CONFINING PRESSURE ###
#######
#the value of (isotropic) confining stress defines the target stress to be applied in all three directions
triax.goal1=
while 1:
print(O.iter)
O.run(1000, True)
##the global unbalanced force on dynamic bodies, thus excluding boundaries, which are not at equilibrium
unb=unbalanced
print ('unbalanced force:',unb,' mean stress: ',triax.meanStress)
if unb<stabilityTh
break
O.save(
#print ("### Isotropic state saved ###")
#######
### REACHING A SPECIFIED POROSITY PRECISELY ###
#######
### We will reach a prescribed value of porosity with the REFD algorithm
### (see http://
### http://
import sys #this is only for the flush() below
while triax.porosity>
## we decrease friction value and apply it to all the bodies and contacts
compFricDegree = 0.95*compFricDegree
setContactFric
print ("\r Friction: ",compFricDegree," porosity:
sys.stdout.flush()
## while we run steps, triax will tend to grow particles as the packing
## keeps shrinking as a consequence of decreasing friction. Consequently
## porosity will decrease
O.run(500,1)
O.save(
#print "### Compacted state saved ###"
O.pause()
print('print')
#######
### DEVIATORIC LOADING ###
#######
##We move to deviatoric loading, let us turn internal compaction off to keep particles sizes constant
triax.internalC
## Change contact friction (remember that decreasing it would generate instantaneous instabilities)
setContactFrict
##set stress control on x and z, we will impose strain rate on y
triax.stressMask = 5
##now goal2 is the target strain rate
triax.goal2=rate
## we define the lateral stresses during the test, here the same 10kPa as for the initial confinement.
triax.goal1=-10000
triax.goal3=-10000
##we can change damping here. What is the effect in your opinion?
newton.damping=0.1
##Save temporary state in live memory. This state will be reloaded from the interface with the "reload" button.
O.saveTmp()
#######
### Example of how to record and plot data ###
#######
from yade import plot
### a function saving variables
def history():
plot.addData(
s11=
s22=
s33=
i=O.iter)
if 1:
## include a periodic engine calling that function in the simulation loop
O.engines=
##O.engines.
else:
## With the line above, we are recording some variables twice. We could in fact replace the previous
## TriaxialRecorder
## by our periodic engine. Uncomment the following line:
O.engines[
O.run(100000,True)
### declare what is to plot. "None" is for separating y and y2 axis
plot.plots=
### the traditional triaxial curves would be more like this:
##plot.
## display on the screen (doesn't work on VMware image it seems)
plot.plot()
##### PLAY THE SIMULATION HERE WITH "PLAY" BUTTON OR WITH THE COMMAND O.run(N) #####
## In that case we can still save the data to a text file at the the end of the simulation, with:
plot.saveDataTx
##or even generate a script for gnuplot. Open another terminal and type "gnuplot plotScriptKEY.
plot.saveGnuplo
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