plugins.ccxinp — pyFormex 1.0.5 documentation

# Source code for plugins.ccxinp

    # $Id$
    ##
    ##  This file is part of pyFormex 1.0.5  (Sat Feb 16 10:40:32 CET 2019)
    ##  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 2004-2018 (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).

    """
    from __future__ import absolute_import, division, print_function

    #
    # DEVS: Try to do this without importing from pyformex
    #

    import re
    import numpy as np
    from pyformex import utils
    from pyformex.coords import concatenate

    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',
        ]

    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:
                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:
                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',
        }

    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

    def startPart(name):
        """Start a new part."""
        global part
        print("Start part %s" % name)
        model.parts.append({'name':name})
        part = model.parts[-1]

    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

    def do_HEADING(opts, data):
        """Read the nodal data"""
        model.heading = '\n'.join(data)

    def do_PART(opts, data):
        """Set the part name"""
        startPart(opts['NAME'])

    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:
            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)

    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'] = concatenate([part['nodid'], nodid])
            part['coords'] = concatenate([part['coords'], coords], axis=0)
        else:
            part['nodid'] = nodid
            part['coords'] = coords

    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)

    def readInput(fn):
        """Read an input file (.inp)

        Returns an object with the following attributes:

        - `heading`: the heading read from the .inp file
        - `parts`: a list with parts.

        A part is a dict and can contain the following keys:

        - `name`: string: the part name
        - `coords`: float (nnod,3) array: the nodal coordinates
        - `nodid`: int (nnod,) array: node numbers; default is arange(nnod)
        - `elems`: int (nelems,nplex) array: element connectivity
        - `elid`: int (nelems,) array: element numbers; default is arange(nelems)
        """
        global line, part, log, model
        dirname, basename, ext = utils.splitFilename(fn,['.inp'])
        logname = utils.buildFilename(dirname,basename+'_ccxinp.log')
        model = InpModel()
        model.parts = []
        startPart('DEFAULT')
        cmd = ''
        with open(logname, 'w') as log:
            with open(fn) as fil:
                data_cont = False
                data = []
                for line in fil:
                    if len(line) == 0:
                        break
                    line = line.upper()
                    if line.startswith('*'):
                        if cmd:
                            endCommand(cmd, opts, data)
                            cmd = ''
                        if line[1] != '*':
                            data = []
                            cmd, opts = readCommand(line[1:])
                            log.write("Keyword %s; Options %s\n" % (cmd, opts))
                            data_cont = False
                    else:
                        line = line.strip()
                        if data_cont:
                            data[-1] += line
                        else:
                            data.append(line)
                        data_cont = line.endswith(',')

        print("Number of parts in model: %s" % len(model.parts))
        return model

    # End