72 lines
3.2 KiB
Python
72 lines
3.2 KiB
Python
# ***************************************************************************
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# * Copyright (c) 2021 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__ = "FreeCAD FEM calculix constraint pressure"
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__author__ = "Bernd Hahnebach"
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__url__ = "https://www.freecad.org"
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import FreeCAD
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def get_analysis_types():
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return ["buckling", "static", "thermomech"]
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def get_sets_name():
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return "constraints_pressure_element_face_loads"
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def get_before_write_meshdata_constraint():
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return ""
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def get_after_write_meshdata_constraint():
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return ""
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def write_meshdata_constraint(f, femobj, prs_obj, ccxwriter):
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# floats read from ccx should use {:.13G}, see comment in writer module
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rev = -1 if prs_obj.Reversed else 1
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# the pressure has to be output in MPa
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pressure_quantity = FreeCAD.Units.Quantity(prs_obj.Pressure.getValueAs("MPa"))
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press_rev = rev * pressure_quantity
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f.write("*DLOAD\n")
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for ref_shape in femobj["PressureFaces"]:
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# the loop is needed for compatibility reason
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# in deprecated method get_pressure_obj_faces_depreciated
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# the face ids where per ref_shape
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f.write("** " + ref_shape[0] + "\n")
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for face, fno in ref_shape[1]:
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if fno > 0: # solid mesh face
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f.write("{},P{},{}\n".format(face, fno, press_rev))
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# on shell mesh face: fno == 0
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# normal of element face == face normal
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elif fno == 0:
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f.write("{},P,{}\n".format(face, press_rev))
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# on shell mesh face: fno == -1
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# normal of element face opposite direction face normal
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elif fno == -1:
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f.write("{},P,{}\n".format(face, -1 * press_rev))
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