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corrected severe bug in (non-logarithmic) strain calculations..!

This commit is contained in:
Philip Eisenlohr 2012-11-30 15:02:25 +00:00
parent 72159e867c
commit faa5f3c459
1 changed files with 15 additions and 13 deletions
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28
processing/post/addStrainTensors.py
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@ -23,12 +23,15 @@ class extendableOption(Option):
def operator(how,vector):
def operator(stretch,strain,eigenvalues):
return { \
'ln': numpy.log(vector)*1.0,\
'Biot': vector *1.0,\
'Green': vector*vector *0.5,\
}[how]
'V#ln': numpy.log(eigenvalues) ,
'U#ln': numpy.log(eigenvalues) ,
'V#Biot': ( numpy.ones(3,'d') - 1.0/eigenvalues ) ,
'U#Biot': ( eigenvalues - numpy.ones(3,'d') ) ,
'V#Green': ( numpy.ones(3,'d') - 1.0/eigenvalues*eigenvalues) *0.5,
'U#Green': ( eigenvalues*eigenvalues - numpy.ones(3,'d')) *0.5,
}[stretch+'#'+strain]
@ -44,14 +47,14 @@ Add column(s) containing given strains based on given stretches of requested def
parser.add_option('-u','--right', action='store_true', dest='right', \
help='calculate strains based on right Cauchy--Green deformation, i.e., C and U')
help='material strains based on right Cauchy--Green deformation, i.e., C and U')
parser.add_option('-v','--left', action='store_true', dest='left', \
help='calculate strains based on left Cauchy--Green deformation, i.e., B and V')
parser.add_option('-l','--logarithmic', action='store_true', dest='logarithmic', \
help='spatial strains based on left Cauchy--Green deformation, i.e., B and V')
parser.add_option('-l','-0','--logarithmic', action='store_true', dest='logarithmic', \
help='calculate logarithmic strain tensor')
parser.add_option('-b','--biot', action='store_true', dest='biot', \
parser.add_option('-b','-1','--biot', action='store_true', dest='biot', \
help='calculate biot strain tensor')
parser.add_option('-g','--green', action='store_true', dest='green', \
parser.add_option('-g','-2','--green', action='store_true', dest='green', \
help='calculate green strain tensor')
parser.add_option('-f','--deformation', dest='defgrad', action='extend', type='string', \
help='heading(s) of columns containing deformation tensor values %default')
@ -153,9 +156,8 @@ for file in files:
V[:,(i+1)%3] = numpy.cross(V[:,(i+2)%3],V[:,i]) # correct next vector
V[:,(i+1)%3] /= numpy.sqrt(numpy.dot(V[:,(i+1)%3],V[:,(i+1)%3].conj())) # and renormalize (hyperphobic?)
for theStrain in strains:
d = operator(theStrain,D) # operate on eigenvalues of U or V
I = operator(theStrain,numpy.ones(3)) # operate on eigenvalues of I (i.e. [1,1,1])
eps = (numpy.dot(V,numpy.dot(numpy.diag(d),V.T)).real-numpy.diag(I)).reshape(9) # build tensor back from eigenvalue/vector basis
d = operator(theStretch,theStrain,D) # operate on eigenvalues of U or V
eps = (numpy.dot(V,numpy.dot(numpy.diag(d),V.T)).real).reshape(9) # build tensor back from eigenvalue/vector basis
table.data_append(list(eps))