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# * Copyright (c) 2020 Sudhanshu Dubey <sudhanshu.thethunder@gmail.com> *
# * 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 *
# * *
# ***************************************************************************
import FreeCAD
from FreeCAD import Rotation
from FreeCAD import Vector
from CompoundTools import CompoundFilter
import Fem
import ObjectsFem
from . import manager
from .manager import get_meshname
from .manager import init_doc
def get_information():
return {
"name": "Constraint Transform Beam Hinged",
"meshtype": "solid",
"meshelement": "Tet10",
"constraints": ["pressure", "displacement", "transform"],
"solvers": ["ccxtools"],
"material": "solid",
"equations": ["mechanical"],
}
def get_explanation(header=""):
return (
header
+ """
To run the example from Python console use:
from femexamples.constraint_transform_beam_hinged import setup
setup()
See forum topic post:
https://forum.freecad.org/viewtopic.php?f=18&t=20238#p157643
Constraint transform on a beam
"""
)
def setup(doc=None, solvertype="ccxtools"):
# init FreeCAD document
if doc is None:
doc = init_doc()
# explanation object
# just keep the following line and change text string in get_explanation method
manager.add_explanation_obj(doc, get_explanation(manager.get_header(get_information())))
# geometric 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
# mirroring
mirror = doc.addObject("Part::Mirroring", "Mirror")
mirror.Source = cut
mirror.Normal = (1, 0, 0)
mirror.Base = (100, 100, 20)
# fusing
fusion = doc.addObject("Part::Fuse", "Fusion")
fusion.Base = cut
fusion.Tool = mirror
fusion.Refine = True
# compound filter
geom_obj = CompoundFilter.makeCompoundFilter(name="CompoundFilter")
geom_obj.Base = fusion
geom_obj.FilterType = "window-volume"
doc.recompute()
if FreeCAD.GuiUp:
geom_obj.Base.ViewObject.hide()
geom_obj.ViewObject.Document.activeView().viewAxonometric()
geom_obj.ViewObject.Document.activeView().fitAll()
# analysis
analysis = ObjectsFem.makeAnalysis(doc, "Analysis")
# solver
if solvertype == "ccxtools":
solver_obj = ObjectsFem.makeSolverCalculiXCcxTools(doc, "CalculiXCcxTools")
solver_obj.WorkingDir = ""
else:
FreeCAD.Console.PrintWarning(
"Unknown or unsupported solver type: {}. "
"No solver object was created.\n".format(solvertype)
)
if solvertype == "ccxtools":
solver_obj.SplitInputWriter = False
solver_obj.AnalysisType = "static"
solver_obj.GeometricalNonlinearity = "linear"
solver_obj.ThermoMechSteadyState = False
solver_obj.MatrixSolverType = "default"
solver_obj.IterationsControlParameterTimeUse = False
analysis.addObject(solver_obj)
# material
material_obj = ObjectsFem.makeMaterialSolid(doc, "FemMaterial")
mat = material_obj.Material
mat["Name"] = "CalculiX-Steel"
mat["YoungsModulus"] = "210000 MPa"
mat["PoissonRatio"] = "0.30"
material_obj.Material = mat
analysis.addObject(material_obj)
# constraint pressure
con_pressure = ObjectsFem.makeConstraintPressure(doc, name="FemConstraintPressure")
con_pressure.References = [(geom_obj, "Face8")]
con_pressure.Pressure = "10.0 MPa"
con_pressure.Reversed = False
analysis.addObject(con_pressure)
# constraint displacement
con_disp = ObjectsFem.makeConstraintDisplacement(doc, name="FemConstraintDisplacement")
con_disp.References = [(geom_obj, "Face4"), (geom_obj, "Face5")]
con_disp.xFree = False
con_disp.xDisplacement = 0.0
analysis.addObject(con_disp)
# constraints transform
con_transform1 = ObjectsFem.makeConstraintTransform(doc, name="FemConstraintTransform1")
con_transform1.References = [(geom_obj, "Face4")]
con_transform1.TransformType = "Cylindrical"
analysis.addObject(con_transform1)
con_transform2 = ObjectsFem.makeConstraintTransform(doc, name="FemConstraintTransform2")
con_transform2.References = [(geom_obj, "Face5")]
con_transform2.TransformType = "Cylindrical"
analysis.addObject(con_transform2)
# 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, get_meshname()))[0]
femmesh_obj.FemMesh = fem_mesh
femmesh_obj.Shape = geom_obj
femmesh_obj.SecondOrderLinear = False
femmesh_obj.CharacteristicLengthMax = "7 mm"
doc.recompute()
return doc
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