273 lines
10 KiB
Python
273 lines
10 KiB
Python
# ***************************************************************************
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# * Copyright (c) 2016 Frantisek Loeffelmann <LoffF@email.cz> *
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# * Copyright (c) 2016 Bernd Hahnebach <bernd@bimstatik.org> *
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# * *
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# * This file is part of the FreeCAD CAx development system. *
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# * *
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# * This program is free software; you can redistribute it and/or modify *
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# * it under the terms of the GNU Lesser General Public License (LGPL) *
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# * as published by the Free Software Foundation; either version 2 of *
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# * the License, or (at your option) any later version. *
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# * for detail see the LICENCE text file. *
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# * *
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# * This program is distributed in the hope that it will be useful, *
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# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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# * GNU Library General Public License for more details. *
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# * *
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# * You should have received a copy of the GNU Library General Public *
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# * License along with this program; if not, write to the Free Software *
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# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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# * USA *
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# * *
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# ***************************************************************************
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__title__ = "Mesh import for Abacus/CalculiX inp file format"
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__author__ = "Frantisek Loeffelmann, Bernd Hahnebach"
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__url__ = "https://www.freecadweb.org"
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__date__ = "04/08/2016"
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## @package importInpMesh
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# \ingroup FEM
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# \brief FreeCAD INP file reader for FEM workbench
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import os
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import FreeCAD
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from FreeCAD import Console
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# ********* generic FreeCAD import and export methods *********
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if open.__module__ == "__builtin__":
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# because we'll redefine open below (Python2)
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pyopen = open
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elif open.__module__ == "io":
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# because we'll redefine open below (Python3)
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pyopen = open
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def open(filename):
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"called when freecad opens a file"
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docname = os.path.splitext(os.path.basename(filename))[0]
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insert(filename, docname)
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def insert(filename, docname):
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"called when freecad wants to import a file"
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try:
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doc = FreeCAD.getDocument(docname)
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except NameError:
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doc = FreeCAD.newDocument(docname)
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FreeCAD.ActiveDocument = doc
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import_inp(filename)
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# ********* module specific methods *********
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def read(filename):
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"""read a FemMesh from a inp mesh file and return the FemMesh
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"""
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# no document object is created, just the FemMesh is returned
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mesh_data = read_inp(filename)
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from . import importToolsFem
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return importToolsFem.make_femmesh(mesh_data)
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def import_inp(filename):
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"""read a FEM mesh from a Z88 mesh file and insert a FreeCAD FEM Mesh object in the ActiveDocument
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"""
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femmesh = read(filename)
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mesh_name = os.path.splitext(os.path.basename(filename))[0]
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if femmesh:
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mesh_object = FreeCAD.ActiveDocument.addObject("Fem::FemMeshObject", mesh_name)
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mesh_object.FemMesh = femmesh
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def read_inp(file_name):
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"""read .inp file """
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# ATM only mesh reading is supported (no boundary conditions)
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class elements():
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tria3 = {}
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tria6 = {}
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quad4 = {}
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quad8 = {}
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tetra4 = {}
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tetra10 = {}
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hexa8 = {}
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hexa20 = {}
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penta6 = {}
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penta15 = {}
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seg2 = {}
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seg3 = {}
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error_seg3 = False # to print "not supported"
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nodes = {}
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model_definition = True
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f = pyopen(file_name, "r")
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line = "\n"
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include = ""
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f_include = None
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while line != "":
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if include:
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line = f_include.readline()
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if line == "":
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f_include.close()
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include = ""
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line = f.readline()
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else:
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line = f.readline()
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if line.strip() == "":
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continue
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elif line[0] == "*": # start/end of a reading set
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if line[0:2] == "**": # comments
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continue
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if line[:8].upper() == "*INCLUDE":
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start = 1 + line.index("=")
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include = line[start:].strip().strip('"')
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include_path = os.path.normpath(include)
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if os.path.isfile(include_path) is True:
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f_include = pyopen(include_path, "r")
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else:
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path_start = os.path.split(file_name)[0]
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include_full_path = os.path.join(path_start, include_path)
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f_include = pyopen(include_full_path, "r")
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continue
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read_node = False
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elm_category = []
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number_of_nodes = 0
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elm_type = ""
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elm_2nd_line = False
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error_seg3 = False
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error_not_supported_elemtype = False
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# reading nodes
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if (line[:5].upper() == "*NODE") and (model_definition is True):
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read_node = True
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elif read_node is True:
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line_list = line.split(",")
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number = int(line_list[0])
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x = float(line_list[1])
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y = float(line_list[2])
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z = float(line_list[3])
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nodes[number] = [x, y, z]
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# reading elements
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elif line[:8].upper() == "*ELEMENT":
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line_list = line[8:].upper().split(",")
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for line_part in line_list:
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if line_part.lstrip()[:4] == "TYPE":
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elm_type = line_part.split("=")[1].strip()
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if elm_type in ["S3", "CPS3", "CPE3", "CAX3"]:
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elm_category = elements.tria3
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number_of_nodes = 3
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elif elm_type in ["S6", "CPS6", "CPE6", "CAX6"]:
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elm_category = elements.tria6
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number_of_nodes = 6
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elif elm_type in ["S4", "S4R", "CPS4", "CPS4R", "CPE4", "CPE4R",
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"CAX4", "CAX4R"]:
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elm_category = elements.quad4
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number_of_nodes = 4
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elif elm_type in ["S8", "S8R", "CPS8", "CPS8R", "CPE8", "CPE8R",
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"CAX8", "CAX8R"]:
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elm_category = elements.quad8
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number_of_nodes = 8
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elif elm_type == "C3D4":
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elm_category = elements.tetra4
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number_of_nodes = 4
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elif elm_type == "C3D10":
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elm_category = elements.tetra10
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number_of_nodes = 10
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elif elm_type in ["C3D8", "C3D8R", "C3D8I"]:
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elm_category = elements.hexa8
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number_of_nodes = 8
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elif elm_type in ["C3D20", "C3D20R", "C3D20RI"]:
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elm_category = elements.hexa20
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number_of_nodes = 20
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elif elm_type == "C3D6":
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elm_category = elements.penta6
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number_of_nodes = 6
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elif elm_type == "C3D15":
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elm_category = elements.penta15
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number_of_nodes = 15
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elif elm_type in ["B31", "B31R", "T3D2"]:
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elm_category = elements.seg2
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number_of_nodes = 2
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elif elm_type in ["B32", "B32R", "T3D3"]:
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elm_category = elements.seg3
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number_of_nodes = 3
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error_seg3 = True # to print "not supported"
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else:
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error_not_supported_elemtype = True
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elif elm_category != [] and number_of_nodes > 0:
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line_list = line.split(",")
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if elm_2nd_line is False:
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number = int(line_list[0])
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elm_category[number] = []
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pos = 1
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else:
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pos = 0
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elm_2nd_line = False
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for en in range(pos, pos + number_of_nodes - len(elm_category[number])):
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try:
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enode = int(line_list[en])
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elm_category[number].append(enode)
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except Exception:
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elm_2nd_line = True
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break
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elif line[:5].upper() == "*STEP":
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model_definition = False
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if error_seg3 is True: # to print "not supported"
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Console.PrintError("Error: seg3 (3-node beam element type) not supported, yet.\n")
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elif error_not_supported_elemtype is True:
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Console.PrintError("Error: {} not supported.\n".format(elm_type))
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f.close()
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# switch from the CalculiX node numbering to the FreeCAD node numbering
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# numbering do not change: tria3, tria6, quad4, quad8, seg2
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for en in elements.tetra4:
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n = elements.tetra4[en]
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elements.tetra4[en] = [n[1], n[0], n[2], n[3]]
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for en in elements.tetra10:
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n = elements.tetra10[en]
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elements.tetra10[en] = [n[1], n[0], n[2], n[3], n[4], n[6], n[5],
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n[8], n[7], n[9]]
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for en in elements.hexa8:
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n = elements.hexa8[en]
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elements.hexa8[en] = [n[5], n[6], n[7], n[4], n[1], n[2], n[3], n[0]]
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for en in elements.hexa20:
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n = elements.hexa20[en]
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elements.hexa20[en] = [n[5], n[6], n[7], n[4], n[1], n[2], n[3], n[0],
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n[13], n[14], n[15], n[12], n[9], n[10], n[11],
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n[8], n[17], n[18], n[19], n[16]]
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for en in elements.penta6:
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n = elements.penta6[en]
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elements.penta6[en] = [n[4], n[5], n[3], n[1], n[2], n[0]]
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for en in elements.penta15:
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n = elements.penta15[en]
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elements.penta15[en] = [n[4], n[5], n[3], n[1], n[2], n[0],
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n[10], n[11], n[9], n[7], n[8], n[6], n[13],
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n[14], n[12]]
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for en in elements.seg3:
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n = elements.seg3[en]
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elements.seg3[en] = [n[0], n[2], n[1]]
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return {
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"Nodes": nodes,
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"Seg2Elem": elements.seg2,
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"Seg3Elem": elements.seg3,
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"Tria3Elem": elements.tria3,
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"Tria6Elem": elements.tria6,
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"Quad4Elem": elements.quad4,
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"Quad8Elem": elements.quad8,
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"Tetra4Elem": elements.tetra4,
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"Tetra10Elem": elements.tetra10,
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"Hexa8Elem": elements.hexa8,
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"Hexa20Elem": elements.hexa20,
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"Penta6Elem": elements.penta6,
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"Penta15Elem": elements.penta15
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}
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