546 lines
23 KiB
Python
546 lines
23 KiB
Python
# ***************************************************************************
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# * *
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# * Copyright (c) 2013 - Joachim Zettler *
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# * Copyright (c) 2013 - Juergen Riegel <FreeCAD@juergen-riegel.net> *
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# * Copyright (c) 2016 - Bernd Hahnebach <bernd@bimstatik.org> *
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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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import FreeCAD
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import os
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from math import pow, sqrt
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import numpy as np
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__title__ = "FreeCAD Calculix library"
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__author__ = "Juergen Riegel , Michael Hindley, Bernd Hahnebach"
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__url__ = "http://www.freecadweb.org"
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if open.__module__ == '__builtin__':
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pyopen = open # because we'll redefine open below
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# read a calculix result file and extract the nodes, displacement vectores and stress values.
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def readResult(frd_input):
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frd_file = pyopen(frd_input, "r")
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nodes = {}
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elements_hexa8 = {}
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elements_penta6 = {}
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elements_tetra4 = {}
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elements_tetra10 = {}
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elements_penta15 = {}
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elements_hexa20 = {}
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elements_tria3 = {}
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elements_tria6 = {}
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elements_quad4 = {}
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elements_quad8 = {}
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elements_seg2 = {}
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results = []
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mode_results = {}
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mode_disp = {}
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mode_stress = {}
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mode_temp = {}
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mode_disp_found = False
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nodes_found = False
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mode_stress_found = False
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mode_temp_found = False
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mode_time_found = False
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elements_found = False
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input_continues = False
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eigenmode = 0
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elem = -1
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elemType = 0
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timestep = 0
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timetemp = 0
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for line in frd_file:
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# Check if we found nodes section
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if line[4:6] == "2C":
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nodes_found = True
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# first lets extract the node and coordinate information from the results file
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if nodes_found and (line[1:3] == "-1"):
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elem = int(line[4:13])
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nodes_x = float(line[13:25])
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nodes_y = float(line[25:37])
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nodes_z = float(line[37:49])
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nodes[elem] = FreeCAD.Vector(nodes_x, nodes_y, nodes_z)
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# Check if we found nodes section
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if line[4:6] == "3C":
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elements_found = True
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# first lets extract element number
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if elements_found and (line[1:3] == "-1"):
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elem = int(line[4:13])
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elemType = int(line[14:18])
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# then import elements
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if elements_found and (line[1:3] == "-2"):
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# node order fits with node order in writeAbaqus() in FemMesh.cpp
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if elemType == 1:
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# C3D8 CalculiX --> hexa8 FreeCAD
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# N6, N7, N8, N5, N2, N3, N4, N1
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nd1 = int(line[3:13])
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nd2 = int(line[13:23])
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nd3 = int(line[23:33])
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nd4 = int(line[33:43])
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nd5 = int(line[43:53])
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nd6 = int(line[53:63])
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nd7 = int(line[63:73])
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nd8 = int(line[73:83])
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elements_hexa8[elem] = (nd6, nd7, nd8, nd5, nd2, nd3, nd4, nd1)
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elif elemType == 2:
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# C3D6 Calculix --> penta6 FreeCAD
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# N5, N6, N4, N2, N3, N1
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nd1 = int(line[3:13])
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nd2 = int(line[13:23])
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nd3 = int(line[23:33])
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nd4 = int(line[33:43])
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nd5 = int(line[43:53])
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nd6 = int(line[53:63])
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elements_penta6[elem] = (nd5, nd6, nd4, nd2, nd3, nd1)
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elif elemType == 3:
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# C3D4 Calculix --> tetra4 FreeCAD
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# N2, N1, N3, N4
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nd1 = int(line[3:13])
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nd2 = int(line[13:23])
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nd3 = int(line[23:33])
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nd4 = int(line[33:43])
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elements_tetra4[elem] = (nd2, nd1, nd3, nd4)
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elif elemType == 4 and input_continues is False:
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# first line
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# C3D20 Calculix --> hexa20 FreeCAD
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# N6, N7, N8, N5, N2, N3, N4, N1, N14, N15, N16, N13, N10, N11, N12, N9, N18, N19, N20, N17
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nd1 = int(line[3:13])
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nd2 = int(line[13:23])
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nd3 = int(line[23:33])
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nd4 = int(line[33:43])
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nd5 = int(line[43:53])
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nd6 = int(line[53:63])
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nd7 = int(line[63:73])
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nd8 = int(line[73:83])
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nd9 = int(line[83:93])
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nd10 = int(line[93:103])
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input_continues = True
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elif elemType == 4 and input_continues is True:
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# second line
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nd11 = int(line[3:13])
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nd12 = int(line[13:23])
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nd13 = int(line[23:33])
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nd14 = int(line[33:43])
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nd15 = int(line[43:53])
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nd16 = int(line[53:63])
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nd17 = int(line[63:73])
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nd18 = int(line[73:83])
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nd19 = int(line[83:93])
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nd20 = int(line[93:103])
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input_continues = False
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# print((nd1, nd2, nd3, nd4, nd5, nd6, nd7, nd8, nd9, nd10,
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# nd11, nd12, nd13, nd14, nd15, nd16, nd17, nd18, nd19, nd20)) # get the element node order of frd file
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# elements_hexa20[elem] = (nd6, nd7, nd8, nd5, nd2, nd3, nd4, nd1, nd14, nd15,
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# nd16, nd13, nd10, nd11, nd12, nd9, nd18, nd19, nd20, nd17)
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# node order exported by ccx into frd is different than node order in inp file
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# elements_hexa20[elem] = (nd6, nd7, nd8, nd5, nd2, nd3, nd4, nd1, nd14, nd15,
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# nd16, nd13, nd18, nd19, nd20, nd17, nd10, nd11, nd12, nd9)
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# hexa20 import works with the following frd file node assignment
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elements_hexa20[elem] = (nd8, nd5, nd6, nd7, nd4, nd1, nd2, nd3, nd20, nd17,
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nd18, nd19, nd12, nd9, nd10, nd11, nd16, nd13, nd14, nd15)
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# print elements_hexa20[elem]
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elif elemType == 5 and input_continues is False:
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# first line
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# C3D15 Calculix --> penta15 FreeCAD
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# N5, N6, N4, N2, N3, N1, N11, N12, N10, N8, N9, N7, N14, N15, N13
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nd1 = int(line[3:13])
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nd2 = int(line[13:23])
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nd3 = int(line[23:33])
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nd4 = int(line[33:43])
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nd5 = int(line[43:53])
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nd6 = int(line[53:63])
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nd7 = int(line[63:73])
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nd8 = int(line[73:83])
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nd9 = int(line[83:93])
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nd10 = int(line[93:103])
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input_continues = True
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elif elemType == 5 and input_continues is True:
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# second line
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nd11 = int(line[3:13])
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nd12 = int(line[13:23])
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nd13 = int(line[23:33])
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nd14 = int(line[33:43])
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nd15 = int(line[43:53])
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input_continues = False
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elements_penta15[elem] = (nd5, nd6, nd4, nd2, nd3, nd1, nd11, nd12, nd10, nd8,
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nd9, nd7, nd14, nd15, nd13)
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elif elemType == 6:
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# C3D10 Calculix --> tetra10 FreeCAD
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# N2, N1, N3, N4, N5, N7, N6, N9, N8, N10
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nd1 = int(line[3:13])
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nd2 = int(line[13:23])
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nd3 = int(line[23:33])
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nd4 = int(line[33:43])
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nd5 = int(line[43:53])
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nd6 = int(line[53:63])
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nd7 = int(line[63:73])
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nd8 = int(line[73:83])
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nd9 = int(line[83:93])
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nd10 = int(line[93:103])
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elements_tetra10[elem] = (nd2, nd1, nd3, nd4, nd5, nd7, nd6, nd9, nd8, nd10)
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elif elemType == 7:
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# S3 Calculix --> tria3 FreeCAD
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# N1, N2, N3
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nd1 = int(line[3:13])
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nd2 = int(line[13:23])
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nd3 = int(line[23:33])
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elements_tria3[elem] = (nd1, nd2, nd3)
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elif elemType == 8:
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# S6 CalculiX --> tria6 FreeCAD
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# N1, N2, N3, N4, N5, N6
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nd1 = int(line[3:13])
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nd2 = int(line[13:23])
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nd3 = int(line[23:33])
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nd4 = int(line[33:43])
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nd5 = int(line[43:53])
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nd6 = int(line[53:63])
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elements_tria6[elem] = (nd1, nd2, nd3, nd4, nd5, nd6)
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elif elemType == 9:
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# S4 CalculiX --> quad4 FreeCAD
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# N1, N2, N3, N4
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nd1 = int(line[3:13])
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nd2 = int(line[13:23])
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nd3 = int(line[23:33])
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nd4 = int(line[33:43])
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elements_quad4[elem] = (nd1, nd2, nd3, nd4)
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elif elemType == 10:
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# S8 CalculiX --> quad8 FreeCAD
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# N1, N2, N3, N4, N5, N6, N7, N8
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nd1 = int(line[3:13])
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nd2 = int(line[13:23])
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nd3 = int(line[23:33])
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nd4 = int(line[33:43])
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nd5 = int(line[43:53])
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nd6 = int(line[53:63])
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nd7 = int(line[63:73])
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nd8 = int(line[73:83])
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elements_quad8[elem] = (nd1, nd2, nd3, nd4, nd5, nd6, nd7, nd8)
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elif elemType == 11:
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# B31 CalculiX --> seg2 FreeCAD
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# N1, N2
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nd1 = int(line[3:13])
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nd2 = int(line[13:23])
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elements_seg2[elem] = (nd1, nd2)
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# Check if we found new eigenmode
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if line[5:10] == "PMODE":
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eigenmode = int(line[30:36])
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# Check if we found displacement section
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if line[5:9] == "DISP":
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mode_disp_found = True
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# we found a displacement line in the frd file
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if mode_disp_found and (line[1:3] == "-1"):
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elem = int(line[4:13])
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mode_disp_x = float(line[13:25])
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mode_disp_y = float(line[25:37])
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mode_disp_z = float(line[37:49])
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mode_disp[elem] = FreeCAD.Vector(mode_disp_x, mode_disp_y, mode_disp_z)
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if line[5:11] == "STRESS":
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mode_stress_found = True
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# we found a displacement line in the frd file
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if mode_stress_found and (line[1:3] == "-1"):
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elem = int(line[4:13])
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stress_1 = float(line[13:25])
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stress_2 = float(line[25:37])
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stress_3 = float(line[37:49])
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stress_4 = float(line[49:61])
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stress_5 = float(line[61:73])
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stress_6 = float(line[73:85])
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mode_stress[elem] = (stress_1, stress_2, stress_3, stress_4, stress_5, stress_6)
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# Check if we found a time step
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if line[4:10] == "1PSTEP":
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mode_time_found = True
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if mode_time_found and (line[2:7] == "100CL"):
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timetemp = float(line[13:25])
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if timetemp > timestep:
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timestep = timetemp
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if line[5:11] == "NDTEMP":
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mode_temp_found = True
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# we found a temperatures line in the frd file
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if mode_temp_found and (line[1:3] == "-1"):
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elem = int(line[4:13])
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temperature = float(line[13:25])
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mode_temp[elem] = (temperature)
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# Check for the end of a section
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if line[1:3] == "-3":
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if mode_disp_found:
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mode_disp_found = False
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if mode_stress_found:
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mode_stress_found = False
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if mode_temp_found:
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mode_temp_found = False
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if mode_time_found:
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mode_time_found = False
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if mode_disp and mode_stress and mode_temp:
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mode_results = {}
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mode_results['number'] = eigenmode
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mode_results['disp'] = mode_disp
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mode_results['stress'] = mode_stress
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mode_results['temp'] = mode_temp
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mode_results['time'] = timestep
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results.append(mode_results)
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mode_disp = {}
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mode_stress = {}
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mode_temp = {}
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eigenmode = 0
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if mode_disp and mode_stress:
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mode_results = {}
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mode_results['number'] = eigenmode
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mode_results['disp'] = mode_disp
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mode_results['stress'] = mode_stress
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mode_results['time'] = 0 # Dont return time if static
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results.append(mode_results)
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mode_disp = {}
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mode_stress = {}
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eigenmode = 0
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nodes_found = False
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elements_found = False
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frd_file.close()
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return {'Nodes': nodes,
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'Hexa8Elem': elements_hexa8, 'Penta6Elem': elements_penta6, 'Tetra4Elem': elements_tetra4, 'Tetra10Elem': elements_tetra10,
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'Penta15Elem': elements_penta15, 'Hexa20Elem': elements_hexa20, 'Tria3Elem': elements_tria3, 'Tria6Elem': elements_tria6,
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'Quad4Elem': elements_quad4, 'Quad8Elem': elements_quad8, 'Seg2Elem': elements_seg2,
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'Results': results}
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def calculate_von_mises(i):
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# Von mises stress (http://en.wikipedia.org/wiki/Von_Mises_yield_criterion)
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s11 = i[0]
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s22 = i[1]
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s33 = i[2]
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s12 = i[3]
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s23 = i[4]
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s31 = i[5]
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s11s22 = pow(s11 - s22, 2)
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s22s33 = pow(s22 - s33, 2)
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s33s11 = pow(s33 - s11, 2)
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s12s23s31 = 6 * (pow(s12, 2) + pow(s23, 2) + pow(s31, 2))
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vm_stress = sqrt(0.5 * (s11s22 + s22s33 + s33s11 + s12s23s31))
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return vm_stress
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def calculate_principal_stress(i):
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sigma = np.array([[i[0], i[3], i[4]],
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[i[3], i[1], i[5]],
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[i[4], i[5], i[2]]])
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# compute principal stresses
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eigvals = list(np.linalg.eigvalsh(sigma))
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eigvals.sort()
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eigvals.reverse()
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maxshear = (eigvals[0] - eigvals[2]) / 2.0
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return (eigvals[0], eigvals[1], eigvals[2], maxshear)
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def importFrd(filename, analysis=None, result_name_prefix=None):
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if result_name_prefix is None:
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result_name_prefix = ''
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m = readResult(filename)
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mesh_object = None
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if(len(m['Nodes']) > 0):
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if analysis is None:
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analysis_name = os.path.splitext(os.path.basename(filename))[0]
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import FemAnalysis
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analysis_object = FemAnalysis.makeFemAnalysis('Analysis')
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analysis_object.Label = analysis_name
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else:
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analysis_object = analysis # see if statement few lines later, if not analysis -> no FemMesh object is created !
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if 'Nodes' in m:
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positions = []
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for k, v in m['Nodes'].iteritems():
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positions.append(v)
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p_x_max, p_y_max, p_z_max = map(max, zip(*positions))
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p_x_min, p_y_min, p_z_min = map(min, zip(*positions))
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x_span = abs(p_x_max - p_x_min)
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y_span = abs(p_y_max - p_y_min)
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z_span = abs(p_z_max - p_z_min)
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span = max(x_span, y_span, z_span)
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if (not analysis):
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import FemMeshTools
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mesh = FemMeshTools.make_femmesh(m)
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if len(m['Nodes']) > 0:
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mesh_object = FreeCAD.ActiveDocument.addObject('Fem::FemMeshObject', 'ResultMesh')
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mesh_object.FemMesh = mesh
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analysis_object.Member = analysis_object.Member + [mesh_object]
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number_of_increments = len(m['Results'])
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for result_set in m['Results']:
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eigenmode_number = result_set['number']
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step_time = result_set['time']
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step_time = round(step_time, 2)
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if eigenmode_number > 0:
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results_name = result_name_prefix + 'mode_' + str(eigenmode_number) + '_results'
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elif number_of_increments > 1:
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results_name = result_name_prefix + 'time_' + str(step_time) + '_results'
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else:
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results_name = result_name_prefix + 'results'
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results = FreeCAD.ActiveDocument.addObject('Fem::FemResultObject', results_name)
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for m in analysis_object.Member:
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if m.isDerivedFrom("Fem::FemMeshObject"):
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results.Mesh = m
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break
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disp = result_set['disp']
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no_of_values = len(disp)
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displacement = []
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for k, v in disp.iteritems():
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displacement.append(v)
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x_max, y_max, z_max = map(max, zip(*displacement))
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if eigenmode_number > 0:
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max_disp = max(x_max, y_max, z_max)
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# Allow for max displacement to be 0.1% of the span
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# FIXME - add to Preferences
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max_allowed_disp = 0.001 * span
|
|
scale = max_allowed_disp / max_disp
|
|
else:
|
|
scale = 1.0
|
|
|
|
if len(disp) > 0:
|
|
results.DisplacementVectors = map((lambda x: x * scale), disp.values())
|
|
results.NodeNumbers = disp.keys()
|
|
if(mesh_object):
|
|
results.Mesh = mesh_object
|
|
|
|
# Read temperatures if they exist
|
|
try:
|
|
Temperature = result_set['temp']
|
|
if len(Temperature) > 0:
|
|
if len(Temperature.values()) != len(disp.values()):
|
|
Temp = []
|
|
Temp_extra_nodes = Temperature.values()
|
|
nodes = len(disp.values())
|
|
for i in range(nodes):
|
|
Temp_value = Temp_extra_nodes[i]
|
|
Temp.append(Temp_value)
|
|
results.Temperature = map((lambda x: x), Temp)
|
|
else:
|
|
results.Temperature = map((lambda x: x), Temperature.values())
|
|
results.Time = step_time
|
|
except:
|
|
pass
|
|
|
|
stress = result_set['stress']
|
|
if len(stress) > 0:
|
|
mstress = []
|
|
prinstress1 = []
|
|
prinstress2 = []
|
|
prinstress3 = []
|
|
shearstress = []
|
|
for i in stress.values():
|
|
mstress.append(calculate_von_mises(i))
|
|
prin1, prin2, prin3, shear = calculate_principal_stress(i)
|
|
prinstress1.append(prin1)
|
|
prinstress2.append(prin2)
|
|
prinstress3.append(prin3)
|
|
shearstress.append(shear)
|
|
if eigenmode_number > 0:
|
|
results.StressValues = map((lambda x: x * scale), mstress)
|
|
results.PrincipalMax = map((lambda x: x * scale), prinstress1)
|
|
results.PrincipalMed = map((lambda x: x * scale), prinstress2)
|
|
results.PrincipalMin = map((lambda x: x * scale), prinstress3)
|
|
results.MaxShear = map((lambda x: x * scale), shearstress)
|
|
results.Eigenmode = eigenmode_number
|
|
else:
|
|
results.StressValues = mstress
|
|
results.PrincipalMax = prinstress1
|
|
results.PrincipalMed = prinstress2
|
|
results.PrincipalMin = prinstress3
|
|
results.MaxShear = shearstress
|
|
|
|
if (results.NodeNumbers != 0 and results.NodeNumbers != stress.keys()):
|
|
print("Inconsistent FEM results: element number for Stress doesn't equal element number for Displacement {} != {}"
|
|
.format(results.NodeNumbers, len(results.StressValues)))
|
|
results.NodeNumbers = stress.keys()
|
|
|
|
x_min, y_min, z_min = map(min, zip(*displacement))
|
|
sum_list = map(sum, zip(*displacement))
|
|
x_avg, y_avg, z_avg = [i / no_of_values for i in sum_list]
|
|
|
|
s_max = max(results.StressValues)
|
|
s_min = min(results.StressValues)
|
|
s_avg = sum(results.StressValues) / no_of_values
|
|
p1_min = min(results.PrincipalMax)
|
|
p1_avg = sum(results.PrincipalMax) / no_of_values
|
|
p1_max = max(results.PrincipalMax)
|
|
p2_min = min(results.PrincipalMed)
|
|
p2_avg = sum(results.PrincipalMed) / no_of_values
|
|
p2_max = max(results.PrincipalMed)
|
|
p3_min = min(results.PrincipalMin)
|
|
p3_avg = sum(results.PrincipalMin) / no_of_values
|
|
p3_max = max(results.PrincipalMin)
|
|
ms_min = min(results.MaxShear)
|
|
ms_avg = sum(results.MaxShear) / no_of_values
|
|
ms_max = max(results.MaxShear)
|
|
|
|
disp_abs = []
|
|
for d in displacement:
|
|
disp_abs.append(sqrt(pow(d[0], 2) + pow(d[1], 2) + pow(d[2], 2)))
|
|
results.DisplacementLengths = disp_abs
|
|
|
|
a_max = max(disp_abs)
|
|
a_min = min(disp_abs)
|
|
a_avg = sum(disp_abs) / no_of_values
|
|
|
|
results.Stats = [x_min, x_avg, x_max,
|
|
y_min, y_avg, y_max,
|
|
z_min, z_avg, z_max,
|
|
a_min, a_avg, a_max,
|
|
s_min, s_avg, s_max,
|
|
p1_min, p1_avg, p1_max,
|
|
p2_min, p2_avg, p2_max,
|
|
p3_min, p3_avg, p3_max,
|
|
ms_min, ms_avg, ms_max]
|
|
analysis_object.Member = analysis_object.Member + [results]
|
|
|
|
if(FreeCAD.GuiUp):
|
|
import FemGui
|
|
FemGui.setActiveAnalysis(analysis_object)
|
|
|
|
|
|
def insert(filename, docname):
|
|
"called when freecad wants to import a file"
|
|
try:
|
|
doc = FreeCAD.getDocument(docname)
|
|
except NameError:
|
|
doc = FreeCAD.newDocument(docname)
|
|
FreeCAD.ActiveDocument = doc
|
|
|
|
importFrd(filename)
|
|
|
|
|
|
def open(filename):
|
|
"called when freecad opens a file"
|
|
docname = os.path.splitext(os.path.basename(filename))[0]
|
|
insert(filename, docname)
|