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FEM: examples, add constraint transform beam hinged example
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src/Mod/Fem/femexamples/constraint_transform_beam_hinged.py
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# *************************************************************************** | ||
# * Copyright (c) 2020 Sudhanshu Dubey <sudhanshu.thethunder@gmail.com> * | ||
# * * | ||
# * 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 * | ||
# * * | ||
# *************************************************************************** | ||
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# to run the example use: | ||
""" | ||
from femexamples.constraint_transform_beam_hinged import setup | ||
setup() | ||
""" | ||
# Constraint transform on a beam | ||
# https://forum.freecadweb.org/viewtopic.php?f=18&t=20238#p157643 | ||
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import FreeCAD | ||
from FreeCAD import Rotation | ||
from FreeCAD import Vector | ||
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import Fem | ||
import ObjectsFem | ||
from CompoundTools import CompoundFilter | ||
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mesh_name = "Mesh" # needs to be Mesh to work with unit tests | ||
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def init_doc(doc=None): | ||
if doc is None: | ||
doc = FreeCAD.newDocument() | ||
return doc | ||
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def get_information(): | ||
info = {"name": "Constraint Transform Beam Hinged", | ||
"meshtype": "solid", | ||
"meshelement": "Tet10", | ||
"constraints": ["pressure", "displacement", "transform"], | ||
"solvers": ["calculix"], | ||
"material": "solid", | ||
"equation": "mechanical" | ||
} | ||
return info | ||
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def setup(doc=None, solvertype="ccxtools"): | ||
# setup cylinder base model | ||
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if doc is None: | ||
doc = init_doc() | ||
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# geometry object | ||
# name is important because the other method in this module use obj name | ||
cube = doc.addObject("Part::Box", "Cube") | ||
cube.Height = "20 mm" | ||
cube.Length = "100 mm" | ||
cylinder = doc.addObject("Part::Cylinder", "Cylinder") | ||
cylinder.Height = "20 mm" | ||
cylinder.Radius = "6 mm" | ||
cylinder.Placement = FreeCAD.Placement( | ||
Vector(10, 12, 10), Rotation(0, 0, 90), Vector(0, 0, 0), | ||
) | ||
cut = doc.addObject("Part::Cut", "Cut") | ||
cut.Base = cube | ||
cut.Tool = cylinder | ||
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# mirroring | ||
mirror = doc.addObject("Part::Mirroring", "Mirror") | ||
mirror.Source = cut | ||
mirror.Normal = (1, 0, 0) | ||
mirror.Base = (100, 100, 20) | ||
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# fusing | ||
fusion = doc.addObject("Part::Fuse", "Fusion") | ||
fusion.Base = cut | ||
fusion.Tool = mirror | ||
fusion.Refine = True | ||
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# compound filter | ||
geom_obj = CompoundFilter.makeCompoundFilter(name='CompoundFilter') | ||
geom_obj.Base = fusion | ||
geom_obj.FilterType = 'window-volume' | ||
doc.recompute() | ||
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if FreeCAD.GuiUp: | ||
geom_obj.Base.ViewObject.hide() | ||
geom_obj.ViewObject.Document.activeView().viewAxonometric() | ||
geom_obj.ViewObject.Document.activeView().fitAll() | ||
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# analysis | ||
analysis = ObjectsFem.makeAnalysis(doc, "Analysis") | ||
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# solver | ||
if solvertype == "calculix": | ||
solver_object = analysis.addObject( | ||
ObjectsFem.makeSolverCalculix(doc, "SolverCalculiX") | ||
)[0] | ||
elif solvertype == "ccxtools": | ||
solver_object = analysis.addObject( | ||
ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiXccxTools") | ||
)[0] | ||
solver_object.WorkingDir = u"" | ||
else: | ||
FreeCAD.Console.PrintWarning( | ||
"Not known or not supported solver type: {}. " | ||
"No solver object was created.\n".format(solvertype) | ||
) | ||
if solvertype == "calculix" or solvertype == "ccxtools": | ||
solver_object.SplitInputWriter = False | ||
solver_object.AnalysisType = "static" | ||
solver_object.GeometricalNonlinearity = "linear" | ||
solver_object.ThermoMechSteadyState = False | ||
solver_object.MatrixSolverType = "default" | ||
solver_object.IterationsControlParameterTimeUse = False | ||
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# material | ||
material_object = analysis.addObject( | ||
ObjectsFem.makeMaterialSolid(doc, "FemMaterial") | ||
)[0] | ||
mat = material_object.Material | ||
mat["Name"] = "CalculiX-Steel" | ||
mat["YoungsModulus"] = "210000 MPa" | ||
mat["PoissonRatio"] = "0.30" | ||
mat["Density"] = "7900 kg/m^3" | ||
mat["ThermalExpansionCoefficient"] = "0.012 mm/m/K" | ||
material_object.Material = mat | ||
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# constraint pressure | ||
pressure_constraint = analysis.addObject( | ||
ObjectsFem.makeConstraintPressure(doc, name="FemConstraintPressure") | ||
)[0] | ||
pressure_constraint.References = [(geom_obj, "Face8")] | ||
pressure_constraint.Pressure = 10.0 | ||
pressure_constraint.Reversed = False | ||
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# constraint_displacement | ||
displacement_constraint = doc.Analysis.addObject( | ||
ObjectsFem.makeConstraintDisplacement(doc, name="FemConstraintDisplacment") | ||
)[0] | ||
displacement_constraint.References = [(geom_obj, "Face4"), (geom_obj, "Face5")] | ||
displacement_constraint.xFree = False | ||
displacement_constraint.xFix = True | ||
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# constraint_transform_1 | ||
transform_constraint1 = doc.Analysis.addObject( | ||
ObjectsFem.makeConstraintTransform(doc, name="FemConstraintTransform1") | ||
)[0] | ||
transform_constraint1.References = [(geom_obj, "Face4")] | ||
transform_constraint1.TransformType = "Cylindrical" | ||
transform_constraint1.X_rot = 0.0 | ||
transform_constraint1.Y_rot = 0.0 | ||
transform_constraint1.Z_rot = 0.0 | ||
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# constraint_transform_2 | ||
transform_constraint2 = doc.Analysis.addObject( | ||
ObjectsFem.makeConstraintTransform(doc, name="FemConstraintTransform2") | ||
)[0] | ||
transform_constraint2.References = [(geom_obj, "Face5")] | ||
transform_constraint2.TransformType = "Cylindrical" | ||
transform_constraint2.X_rot = 0.0 | ||
transform_constraint2.Y_rot = 0.0 | ||
transform_constraint2.Z_rot = 0.0 | ||
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# mesh | ||
from .meshes.mesh_transform_beam_hinged_tetra10 import create_nodes, create_elements | ||
fem_mesh = Fem.FemMesh() | ||
control = create_nodes(fem_mesh) | ||
if not control: | ||
FreeCAD.Console.PrintError("Error on creating nodes.\n") | ||
control = create_elements(fem_mesh) | ||
if not control: | ||
FreeCAD.Console.PrintError("Error on creating elements.\n") | ||
femmesh_obj = analysis.addObject( | ||
ObjectsFem.makeMeshGmsh(doc, mesh_name) | ||
)[0] | ||
femmesh_obj.FemMesh = fem_mesh | ||
femmesh_obj.Part = geom_obj | ||
femmesh_obj.SecondOrderLinear = False | ||
femmesh_obj.CharacteristicLengthMax = '7 mm' | ||
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doc.recompute() | ||
return doc |
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