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# * Copyright (c) 2020 Sudhanshu Dubey <sudhanshu.thethunder@gmail.com> *
# * Copyright (c) 2020 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 math
import FreeCAD
from FreeCAD import Rotation
from FreeCAD import Vector
import Part
import Sketcher
from BOPTools.SplitFeatures import makeBooleanFragments
from BOPTools.SplitFeatures import makeSlice
from CompoundTools.CompoundFilter import makeCompoundFilter
import Fem
import ObjectsFem
from . import manager
from .manager import get_meshname
from .manager import init_doc
def get_information():
return {
"name": "Constraint Section Print",
"meshtype": "solid",
"meshelement": "Tet10",
"constraints": ["section_print", "fixed", "pressure"],
"solvers": ["ccxtools"],
"material": "solid",
"equations": ["mechanical"],
}
def get_explanation(header=""):
return (
header
+ """
To run the example from Python console use:
from femexamples.constraint_section_print import setup
setup()
See forum topic post:
https://forum.freecad.org/viewtopic.php?t=43044
constraint section print with volume elements
"""
)
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 objects
# the part sketch
arc_sketch = doc.addObject("Sketcher::SketchObject", "Arc_Sketch")
arc_sketch.Placement = FreeCAD.Placement(Vector(0, 0, 0), Rotation(0, 0, 0, 1))
arc_sketch.MapMode = "Deactivated"
# not the exact geometry which makes a closed wire
# exact geometry will be made by the constraints
# the order is important for the constraints definition
geoList = [
Part.ArcOfCircle(Part.Circle(Vector(0, 0, 0), Vector(0, 0, 1), 47), 0, math.pi),
Part.ArcOfCircle(
Part.Circle(Vector(-19, -22, 0), Vector(0, 0, 1), 89),
math.pi / 12,
math.pi / 1.1,
),
Part.LineSegment(Vector(-105, 0, 0), Vector(-47, 0, 0)),
Part.LineSegment(Vector(47, 0, 0), Vector(67, 0, 0)),
]
arc_sketch.addGeometry(geoList, False)
# https://wiki.freecad.org/Sketcher_ConstrainCoincident
# but the best way is to add a constraint is watching
# FreeCAD python console while create this one by the Gui
conList = [
Sketcher.Constraint("Coincident", 0, 3, -1, 1),
Sketcher.Constraint("PointOnObject", 0, 2, -1),
Sketcher.Constraint("PointOnObject", 0, 1, -1),
Sketcher.Constraint("PointOnObject", 1, 2, -1),
Sketcher.Constraint("PointOnObject", 1, 1, -1),
Sketcher.Constraint("Coincident", 2, 1, 0, 2),
Sketcher.Constraint("Coincident", 2, 2, 1, 2),
Sketcher.Constraint("Coincident", 3, 1, 1, 1),
Sketcher.Constraint("Coincident", 3, 2, 0, 1),
Sketcher.Constraint("DistanceX", 2, 2, 2, 1, 58),
Sketcher.Constraint("DistanceX", 3, 2, 3, 1, 20),
Sketcher.Constraint("Radius", 0, 47),
Sketcher.Constraint("Radius", 1, 89),
]
arc_sketch.addConstraint(conList)
# the part extrusion
extrude_part = doc.addObject("Part::Extrusion", "ArcExtrude")
extrude_part.Base = arc_sketch
extrude_part.DirMode = "Custom"
extrude_part.Dir = Vector(0.00, 0.00, 1.00)
extrude_part.DirLink = None
extrude_part.LengthFwd = 30.00
extrude_part.LengthRev = 0.00
extrude_part.Solid = True
extrude_part.Reversed = False
extrude_part.Symmetric = True
extrude_part.TaperAngle = 0.00
extrude_part.TaperAngleRev = 0.00
# section plane sketch
section_sketch = doc.addObject("Sketcher::SketchObject", "Section_Sketch")
section_sketch.Placement = FreeCAD.Placement(
Vector(0.000000, 0.000000, 0.000000),
Rotation(0.000000, 0.000000, 0.000000, 1.000000),
)
section_sketch.MapMode = "Deactivated"
section_sketch.addGeometry(
Part.LineSegment(Vector(-6.691961, -16.840161, 0), Vector(75.156087, 79.421394, 0)),
False,
)
# section_sketch.ExternalGeometry = extrude_part
# section plane extrusion
extrude_section_plane = doc.addObject("Part::Extrusion", "SectionPlaneExtrude")
extrude_section_plane.Base = section_sketch
extrude_section_plane.DirMode = "Custom"
extrude_section_plane.Dir = Vector(0.00, 0.00, -1.00)
extrude_section_plane.DirLink = None
extrude_section_plane.LengthFwd = 40.00
extrude_section_plane.LengthRev = 0.00
extrude_section_plane.Solid = False
extrude_section_plane.Reversed = False
extrude_section_plane.Symmetric = True
extrude_section_plane.TaperAngle = 0.00
extrude_section_plane.TaperAngleRev = 0.00
# TODO the extrusions could be done with much less code, see BOLTS
if FreeCAD.GuiUp:
arc_sketch.ViewObject.hide()
section_sketch.ViewObject.hide()
extrude_part.ViewObject.hide()
extrude_section_plane.ViewObject.hide()
Slice = makeSlice(name="Slice")
Slice.Base = extrude_part
Slice.Tools = extrude_section_plane
Slice.Mode = "Split"
# Slice.Proxy.execute(Slice)
Slice.purgeTouched()
# compound filter to get the solids of the slice
solid_one = makeCompoundFilter(name="SolidOne")
solid_one.Base = Slice
solid_one.FilterType = "specific items"
solid_one.items = "0"
# solid_one.Proxy.execute(solid_one)
solid_one.purgeTouched()
if FreeCAD.GuiUp:
solid_one.Base.ViewObject.hide()
solid_two = makeCompoundFilter(name="SolidTwo")
solid_two.Base = Slice
solid_two.FilterType = "specific items"
solid_two.items = "1"
# solid_two.Proxy.execute(solid_two)
solid_two.purgeTouched()
if FreeCAD.GuiUp:
solid_two.Base.ViewObject.hide()
# CompSolid out of the two solids
geom_obj = makeBooleanFragments(name="BooleanFragments")
geom_obj.Objects = [solid_one, solid_two]
geom_obj.Mode = "CompSolid"
# geom_obj.Proxy.execute(geom_obj)
geom_obj.purgeTouched()
if FreeCAD.GuiUp:
solid_one.ViewObject.hide()
solid_two.ViewObject.hide()
doc.recompute()
if FreeCAD.GuiUp:
geom_obj.ViewObject.Transparency = 50
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, "Material")
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 fixed
con_fixed = ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
con_fixed.References = [(geom_obj, "Face9")]
analysis.addObject(con_fixed)
# constraint pressure
con_pressure = ObjectsFem.makeConstraintPressure(doc, "ConstraintPressure")
con_pressure.References = [(geom_obj, "Face1")]
con_pressure.Pressure = "100.0 MPa"
con_pressure.Reversed = False
analysis.addObject(con_pressure)
# constraint section print
con_sectionpr = ObjectsFem.makeConstraintSectionPrint(doc, "ConstraintSectionPrint")
con_sectionpr.References = [(geom_obj, "Face6")]
analysis.addObject(con_sectionpr)
# mesh
from .meshes.mesh_section_print_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
doc.recompute()
return doc
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