DAMASK_EICMD/processing/post/addCauchy.py

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#!/usr/bin/env python
# -*- coding: UTF-8 no BOM -*-
import os,sys,string
import numpy as np
from optparse import OptionParser
import damask
scriptID = string.replace('$Id$','\n','\\n')
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scriptName = os.path.splitext(scriptID.split()[1])[0]
# --------------------------------------------------------------------
# MAIN
# --------------------------------------------------------------------
parser = OptionParser(option_class=damask.extendableOption, usage='%prog options [file[s]]', description = """
Add column(s) containing Cauchy stress based on given column(s) of deformation gradient and first Piola--Kirchhoff stress.
""", version = scriptID)
parser.add_option('-f','--defgrad',
dest = 'defgrad',
type = 'string', metavar = 'string',
help = 'heading of columns containing deformation gradient [%default]')
parser.add_option('-p','--stress',
dest = 'stress',
type = 'string', metavar = 'string',
help = 'heading of columns containing first Piola--Kirchhoff stress [%default]')
parser.set_defaults(defgrad = 'f',
stress = 'p',
)
(options,filenames) = parser.parse_args()
# --- loop over input files -------------------------------------------------------------------------
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if filenames == []: filenames = [None]
for name in filenames:
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try:
table = damask.ASCIItable(name = name, buffered = False)
except:
continue
table.croak(damask.util.emph(scriptName)+(': '+name if name else ''))
# ------------------------------------------ read header ------------------------------------------
table.head_read()
# ------------------------------------------ sanity checks ----------------------------------------
errors = []
column = {}
for tensor in [options.defgrad,options.stress]:
dim = table.label_dimension(tensor)
if dim < 0: errors.append('column {} not found.'.format(tensor))
elif dim != 9: errors.append('column {} is not a tensor.'.format(tensor))
else:
column[tensor] = table.label_index(tensor)
if errors != []:
table.croak(errors)
table.close(dismiss = True)
continue
# ------------------------------------------ assemble header --------------------------------------
table.info_append(scriptID + '\t' + ' '.join(sys.argv[1:]))
table.labels_append(['%i_Cauchy'%(i+1) for i in xrange(9)]) # extend ASCII header with new labels
table.head_write()
# ------------------------------------------ process data ------------------------------------------
outputAlive = True
while outputAlive and table.data_read(): # read next data line of ASCII table
F = np.array(map(float,table.data[column[options.defgrad]:column[options.defgrad]+9]),'d').reshape(3,3)
P = np.array(map(float,table.data[column[options.stress ]:column[options.stress ]+9]),'d').reshape(3,3)
table.data_append(list(1.0/np.linalg.det(F)*np.dot(P,F.T).reshape(9))) # [Cauchy] = (1/det(F)) * [P].[F_transpose]
outputAlive = table.data_write() # output processed line
# ------------------------------------------ output finalization -----------------------------------
table.close() # close input ASCII table (works for stdin)