New question #652966 on Yade:
https://answers.launchpad.net/yade/+question/652966
from your website, i can see there is a command called
utlis.getStressAndTangent() which can give a macroscopic Tangent. However,
the program with such command has error:
AttributeError: 'module' object has no attribute 'getStressAndTangent'
Yade on my computer is 1.07.0, i am wondering it is the version problem.
And also, if it is the version problem, how can i update the Yade version, for
i have input " sudo apt-get install yade" in terminal and it says the version
is the newest.
You can use such codes to test what i met:
-------------------------------------------------------------------------
#!/usr/bin/python # This is server.py file
import string
from yade import plot,qt
from yade.pack import *
from yade import pack, plot
import socket # Import socket module
import numpy # initial the math of matrix compute (needed in ns)
# initial the global variables
arrcc =[0]*3 # last step strain(commit)
arrtt =[0]*3 # last step strain(trail)
scc=[0]*3 # last step stress
orst=1 # initialize the orginal save document(trial)
check=[0]*1 # I need to calculate the first step when ag=0
check[0]=0
theTangent=(0)
# load the identical package
O.load('/tmp/cccc.gz') # only load the package, because the O.cell.velGrad is
not compatible with the peri3dcontroller eigine
#O.periodic=True ### note!!! add
O.dt=1e-8
# see the example of peri3dcontroller, 1.5 is used to speed up the computation
EnlargeFactor=1.5
EnlargeFactor=1.0
O.engines=[
ForceResetter(),
InsertionSortCollider([Bo1_Sphere_Aabb(aabbEnlargeFactor=EnlargeFactor,label='bo1s')]),
InteractionLoop(
[Ig2_Sphere_Sphere_ScGeom(interactionDetectionFactor=EnlargeFactor,label='ig2ss')],
[Ip2_CpmMat_CpmMat_CpmPhys()],[Law2_ScGeom_CpmPhys_Cpm()]),
NewtonIntegrator(),
#VTKRecorder(fileName='3dfirst-vtk-',recorders=['all','cpm'],iterPeriod=4999),
]
O.cell.velGrad=utils.Matrix3(0,0,0,0,0,0,0,0,0)
O.step()
bo1s.aabbEnlargeFactor=ig2ss.interactionDetectionFactor=1. #
O.step and change 1.5 back to 1. , because the concrete model is developed in
the 1. environment
if orst==1:
print "orst1"
for b in O.bodies:
b.material.young = 1.0001*17e10
orst=2
ag = [0]*3 # current - last ie. the changed strain
ag[0] = 0
ag[1]= 0
ag[2] =0
ns=100
dstrain = utils.Matrix3(ag[0],ag[2],0,0,ag[1],0,0,0,0) # the goal
strain xx xy xz, yx yy yz, zx zy zz
O.cell.velGrad=dstrain/(ns*O.dt)
O.run(ns,True)
stressValue=utils.getStress()
stressxx=stressValue[0,0] # the
return stress xx
stressyy=stressValue[1,1] # the
return stress yy
stressxy=(stressValue[0,1]+stressValue[1,0])/2 # the
return stress xy = (xy + yx)/2
print "stress here from strain[0,0,0] step 1"
print stressxx
print stressyy
print stressxy
theTangent=utils.getStressAndTangent()
print theTangent
O.saveTmp('first')
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Thanks a lot!
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