Triaxial sphere packing and .stl geometry
Hi,
Is it possible use triaxial sphere packing and an imported .stl geometry at the same script?
I'm doing it, but occurs some distortion in my geometry.
Tks.,
Luis
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#2 |
Hi,
For the YADE 1.12 in Ubuntu 14.04LTS, the script with triax compression and a geometry .stl doesn't work.
The same script for YADE 1.07 in Ubuntu 12.04LTS worked.
Tks,
Luis
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#3 |
Hello Luis,
I don't understand the initial question sorry.
Regarding #2, we don't know what script you refer to, nor the meaning of "doesn't work".
I suggest to elaborate a bit more, else nobody can help.
Bruno
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#4 |
Sorry Bruno,
I'm using Triax and an imported geometry .stl in the same script:
#!/usr/bin/python
# -*- coding: utf-8 -*-
#######
### DEFINING VARIABLES AND MATERIALS ###
#######
# The following 5 lines will be used later for batch execution
nRead=readParam
num_spheres=
compFricDegree = 30, # contact friction during the confining phase
key='_
unknownOk=True
)
from yade.params import table
num_spheres=
key=table.key
targetPorosity = 0.45 #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 plates
O.materials.
O.materials.
## create walls around the packing
walls=aabbWalls
wallIds=
## use a SpherePack object to generate a random loose particles packing
sp=pack.
clumps=False #turn this true for the same example with clumps
if clumps:
## approximate mean rad of the futur dense packing for latter use
volume = (mx[0]-
mean_rad = pow(0.09*
## define a unique clump type (we could have many, see clumpCloud documentation)
c1=pack.
## generate positions and input them in the simulation
sp.makeClumpCl
sp.toSimulatio
O.bodies.
else:
sp.makeCloud(
# O.bodies.
#or alternatively (higher level function doing exactly the same):
sp.toSimulatio
#######
### 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_
[Law2_
),
## 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.
## UNCOMMENT THE FOLLOWING SECTIONS ONE BY ONE
## DEPENDING ON YOUR EDITOR, IT COULD BE DONE
## BY SELECTING THE CODE BLOCKS BETWEEN THE SUBTITLES
## AND PRESSING CTRL+SHIFT+D
#######
### APPLYING CONFINING PRESSURE ###
#######
#the value of (isotropic) confining stress defines the target stress to be applied in all three directions
triax.goal1=
while 1:
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 ###"
#######
### 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
from yade import ymport
mesh = 'coneplanosimul
rod = O.bodies.
O.engines=[
ForceResetter(),
InsertionSor
InteractionLoop(
# handle sphere+sphere and facet+sphere collisions
[Ig2_Sphere_
[Ip2_FrictMat_
[Law2_
),
NewtonIntegr
TranslationE
]
But for YADE 1.12 in Ubuntu 14.04LTS didn't work.
Luis
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|
#5 |
This question was expired because it remained in the 'Open' state without activity for the last 15 days.