#
##
## This file is part of pyFormex 2.0 (Mon Sep 14 12:29:05 CEST 2020)
## pyFormex is a tool for generating, manipulating and transforming 3D
## geometrical models by sequences of mathematical operations.
## Home page: http://pyformex.org
## Project page: http://savannah.nongnu.org/projects/pyformex/
## Copyright 2004-2020 (C) Benedict Verhegghe (benedict.verhegghe@ugent.be)
## Distributed under the GNU General Public License version 3 or later.
##
## This program is free software: you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program. If not, see http://www.gnu.org/licenses/.
##
"""
Interface with Abaqus/Calculix FE input files (.inp).
"""
import re
import numpy as np
from pyformex import Path
from pyformex import utils
re_eltypeB = re.compile("^(?P<type>B)(?P<ndim>[23])(?P<degree>\d)?(?P<mod>(OS)?H*)$")
re_eltype = re.compile("^(?P<type>.*?)(?P<ndim>[23]D)?(?P<nplex>\d+)?(?P<mod>[HIMRSW]*)$")
#
# List of known Abaqus/Calculix element type
#
#
abq_elems = [
'SPRINGA',
'CONN3D2', 'CONN2D2',
'FRAME3D', 'FRAME2D',
'T2D2', 'T2D2H', 'T2D3', 'T2D3H',
'T3D2', 'T3D2H', 'T3D3', 'T3D3H',
'B21', 'B21H', 'B22', 'B22H', 'B23', 'B23H',
'B31', 'B31H', 'B32', 'B32H', 'B33', 'B33H',
'M3D3',
'M3D4', 'M3D4R',
'M3D6', 'M3D8',
'M3D8R',
'M3D9', 'M3D9R',
'CPS3',
'CPS4', 'CPS4I', 'CPS4R',
'CPS6', 'CPS6M',
'CPS8', 'CPS8R', 'CPS8M',
'CPE3', 'CPE3H',
'CPE4', 'CPE4H', 'CPE4I', 'CPE4IH', 'CPE4R', 'CPE4RH',
'CPE6', 'CPE6H', 'CPE6M', 'CPE6MH',
'CPE8', 'CPE8H', 'CPE8R', 'CPE8RH',
'CPEG3', 'CPEG3H',
'CPEG4', 'CPEG4H', 'CPEG4I', 'CPEG4IH', 'CPEG4R', 'CPEG4RH',
'CPEG6', 'CPEG6H', 'CPEG6M', 'CPEG6MH',
'CPEG8', 'CPEG8H', 'CPEG8R', 'CPEG8RH',
'CAX6', 'CAX8', 'CAX8R',
'S3', 'S3R', 'S3RS',
'S4', 'S4R', 'S4RS', 'S4RSW', 'S4R5',
'S8R', 'S8R5',
'S9R5',
'STRI3',
'STRI65',
'SC8R',
'SFM3D3',
'SFM3D4', 'SFM3D4R',
'SFM3D6',
'SFM3D8', 'SFM3D8R',
'C3D4', 'C3D4H',
'C3D6', 'C3D6H',
'C3D8', 'C3D8I', 'C3D8H', 'C3D8R', 'C3D8RH', 'C3D10',
'C3D10H', 'C3D10M', 'C3D10MH',
'C3D15', 'C3D15H',
'C3D20', 'C3D20H', 'C3D20R', 'C3D20RH',
'R2D2', 'RB2D2', 'RB3D2', 'RAX2', 'R3D3', 'R3D4',
]
[docs]def abq_eltype(eltype):
"""Analyze an Abaqus element type and return eltype characteristics.
Returns a dictionary with:
- type: the element base type
- ndim: the dimensionality of the element
- nplex: the plexitude (number of nodes)
- mod: a modifier string
Currently, all these fields are returned as strings. We should probably
change ndim and nplex to an int.
"""
if eltype.startswith('B'):
m = re_eltypeB.match(eltype)
else:
m = re_eltype.match(eltype)
if m:
d = m.groupdict()
try:
nplex = int(d['nplex'])
except Exception:
if 'degree' in d:
degree = int(m.group('degree'))
if degree == 2:
nplex = 3
else:
nplex = 2
elif d['type'] == 'FRAME':
nplex = 2
elif d['type'] == 'SPRINGA':
nplex = 1
else:
nplex = 0
d['nplex'] = nplex
if 'ndim' not in d or d['ndim'] is None:
if d['type'][:2] in ['CP', 'CA']:
d['ndim'] = '2'
if d['type'] in ['R'] and d['nplex']==4:
d['ndim'] = '2'
try:
ndim = int(d['ndim'][0])
except Exception:
ndim = 3
d['ndim'] = ndim
if 'mod' not in d or d['mod'] is None:
d['mod'] = ''
d['avail'] = 'A' # Available in Abaqus
d['pyf'] = pyf_eltype(d)
else:
d = {}
return d
known_eltypes = {
1: {'point': ['SPRINGA', ]},
2: {'line2': ['CONN', 'FRAME', 'T', 'B', 'RB', 'RAX', ]},
3: {'line3': ['B', ],
'tri3': ['M', 'CPS', 'CPE', 'CPEG', 'S', 'SFM', 'R', ]},
4: {'quad4': ['M', 'CPS', 'CPE', 'CPEG', 'S', 'SFM', 'R', ],
'tet4': ['C', ]},
6: {'': ['M', 'CPS', 'CPE', 'CPEG', 'SFM', ],
'wedge6': ['C', ]},
8: {'quad8': ['M', 'CPS', 'CPE', 'CPEG', 'CAX', 'S', 'SFM', ],
'hex8': ['C', ]},
9: {'quad9': ['M', 'S']},
10: {'tet10': ['C', ]},
15: {'': ['C', ]},
20: {'hex20': ['C', ]},
}
pyf_eltypes = {
1: 'point',
2: 'line2',
3: {2: 'line3', 3: 'tri3'},
4: {2: 'quad4', 3: 'tet4'},
6: {2: '', 3: 'wedge6'},
8: {2: 'quad8', 3: 'hex8'},
9: 'quad9',
10: 'tet10',
15: '',
20: 'hex20',
}
[docs]def pyf_eltype(d):
"""Return the best matching pyFormex element type for an abq/ccx element
d is an element groupdict obtained by scanning the element name.
"""
eltype = pyf_eltypes.get(d['nplex'], '')
if isinstance(eltype, dict):
eltype = eltype[d['ndim']]
return eltype
def print_catalog():
for el in abq_elems:
d = abq_eltype(el)
if d:
print("Eltype %s = Type %s, ndim %s, nplex %s, mod %s, pyf_type %s" % (el, d['type'], d['ndim'], d['nplex'], d['mod'], d['pyf']))
else:
print("No match: %s" % el)
#print_catalog()
#
# TODO: S... and RAX elements are still scanned wrongly
#
class InpModel(object):
pass
model = None
system = None
skip_unknown_eltype = False
log = None
part = None
[docs]def startPart(name):
"""Start a new part."""
global part
print("Start part %s" % name)
model.parts.append({'name': name})
part = model.parts[-1]
[docs]def readCommand(line):
"""Read a command line, return the command and a dict with options"""
if line[0] == '*':
line = line[1:]
s = line.split(',')
s = [si.strip() for si in s]
cmd = s[0]
opts = {}
for si in s[1:]:
kv = si.split('=')
k = kv[0]
if len(kv) > 1:
v = kv[1]
else:
v = True
opts[k] = v
return cmd, opts
[docs]def do_HEADING(opts, data):
"""Read the nodal data"""
model.heading = '\n'.join(data)
[docs]def do_PART(opts, data):
"""Set the part name"""
startPart(opts['NAME'])
[docs]def do_SYSTEM(opts, data):
"""Read the system data"""
global system
if len(data) == 0:
system = None
return
s = data[0].split(',')
A = [float(v) for v in s[:3]]
try:
B = [float(v) for v in s[3:]]
except Exception:
B, C = None, None
if len(data) > 1:
C = [float(v) for v in data[1].split('')]
else:
B[2] = 0.
C = [-B[1], B[0], 0.]
t = array(A)
if B is None:
r = None
else:
r = rotmat(array([A, B, C]))
system = (t, r)
[docs]def do_NODE(opts, data):
"""Read the nodal data"""
nnodes = len(data)
print("Read %s nodes" % nnodes)
ndata = len(data[0].split())
data = ','.join(data)
with open('%s-NODE.data'%part['name'], 'w') as f:
f.write(data)
x = np.fromstring(data, dtype=np.float32, count=ndata*nnodes, sep=',').reshape(-1, ndata)
nodid = x[:, 0].astype(np.int32)
coords = x[:, 1:]
if system:
t, r = system
if r is not None:
coords = dot(coords, r)
coords += t
if 'coords' in part:
part['nodid'] = np.concatenate([part['nodid'], nodid])
part['coords'] = np.concatenate([part['coords'], coords], axis=0)
else:
part['nodid'] = nodid
part['coords'] = coords
[docs]def do_ELEMENT(opts, data):
"""Read element data"""
d = abq_eltype(opts['TYPE'])
eltype = d['pyf']
if not eltype:
if skip_unknown_eltype:
return
else:
raise ValueError("Element type '%s' can not yet be imported" % opts['TYPE'])
nplex = d['nplex']
nelems = len(data)
print("Read %s elements of type %s, plexitude %s" % (nelems, eltype, nplex))
ndata = nplex+1
data = ','.join(data)
with open('%s-ELEMENT.data'%part['name'], 'w') as f:
f.write(data)
e = np.fromstring(data, dtype=np.int32, count=ndata*nelems, sep=',').reshape(-1, ndata)
elid = e[:, 0]
elems = e[:, 1:]
if not 'elems' in part:
part['elems'] = []
if not 'elid' in part:
part['elid'] = []
part['elems'].append((eltype, elems))
part['elid'].append(elid)
def endCommand(cmd, opts, data):
global log
func = 'do_%s' % cmd
if func in globals():
globals()[func](opts, data)
else:
#print("Data %s" % data)
log.write("Don't know how to handle keyword '%s'\n" % cmd)
# End
