File size: 3,398 Bytes
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# * Copyright (c) 2021 Bernd Hahnebach <bernd@bimstatik.org> *
# * *
# * This file is part of the FreeCAD CAx development system. *
# * *
# * This program is free software; you can redistribute it and/or modify *
# * it under the terms of the GNU Lesser General Public License (LGPL) *
# * as published by the Free Software Foundation; either version 2 of *
# * the License, or (at your option) any later version. *
# * for detail see the LICENCE text file. *
# * *
# * 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 Library General Public License for more details. *
# * *
# * You should have received a copy of the GNU Library General Public *
# * License along with this program; if not, write to the Free Software *
# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
# * USA *
# * *
# ***************************************************************************
__title__ = "FreeCAD FEM calculix constraint force"
__author__ = "Bernd Hahnebach"
__url__ = "https://www.freecad.org"
def get_analysis_types():
return ["buckling", "static", "thermomech"]
def get_sets_name():
return "constraints_force_node_loads"
def get_before_write_meshdata_constraint():
return ""
def get_after_write_meshdata_constraint():
return ""
def write_meshdata_constraint(f, femobj, force_obj, ccxwriter):
# floats read from ccx should use {:.13G}, see comment in writer module
if force_obj.EnableAmplitude:
f.write(f"*CLOAD, AMPLITUDE={force_obj.Name}\n")
else:
f.write("*CLOAD\n")
direction_vec = femobj["Object"].DirectionVector
dir_zero_tol = 1e-15 # TODO: should this be more generally for more values?
# be careful with raising the tolerance, a big load would have an impact
# but compared to the real direction the impact would be small again
for ref_shape in femobj["NodeLoadTable"]:
f.write(f"** {ref_shape[0]}\n")
for n in sorted(ref_shape[1]):
node_load = ref_shape[1][n]
# the loads in ref_shape[1][n] are without unit
if abs(direction_vec.x) > dir_zero_tol:
v1 = f"{(direction_vec.x * node_load).Value:.13G}"
f.write(f"{n},1,{v1}\n")
if abs(direction_vec.y) > dir_zero_tol:
v2 = f"{(direction_vec.y * node_load).Value:.13G}"
f.write(f"{n},2,{v2}\n")
if abs(direction_vec.z) > dir_zero_tol:
v3 = f"{(direction_vec.z * node_load).Value:.13G}"
f.write(f"{n},3,{v3}\n")
f.write("\n")
f.write("\n")
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