/
constraint_centrif.py
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/
constraint_centrif.py
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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 *
# * *
# ***************************************************************************
import FreeCAD
from FreeCAD import Vector as vec
from BasicShapes import Shapes
from Draft import clone
from Part import makeLine
import Fem
import ObjectsFem
from . import manager
from .manager import get_meshname
from .manager import init_doc
def get_information():
return {
"name": "Constraint Centrif",
"meshtype": "solid",
"meshelement": "Tet10",
"constraints": ["centrif", "fixed"],
"solvers": ["calculix"],
"material": "multimaterial",
"equation": "mechanical"
}
def get_explanation(header=""):
return header + """
To run the example from Python console use:
from femexamples.constraint_centrif import setup
setup()
See forum topic post:
https://forum.freecadweb.org/viewtopic.php?f=18&t=57770
constraint centrif, concerning CENTRIF label from ccx's *DLOAD card
"""
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
# ring
stiffener = doc.addObject("Part::Box", "Stiffener")
stiffener.Length = 10
stiffener.Width = 200
stiffener.Height = 10
stiffener.Placement.Base = (-5, -100, 0)
circumference = Shapes.addTube(doc, "Circumference")
circumference.Height = 10.0
circumference.InnerRadius = 97.5
circumference.OuterRadius = 102.5
doc.recompute()
fusion = doc.addObject("Part::MultiFuse", "Fusion")
fusion.Shapes = [stiffener, circumference]
doc.recompute()
centerhole = doc.addObject("Part::Cylinder", "CenterHole")
centerhole.Radius = 3
centerhole.Height = 20
doc.recompute()
ring_bottom = doc.addObject("Part::Cut", "RingBottom")
ring_bottom.Base = fusion
ring_bottom.Tool = centerhole
doc.recompute()
# standard ring
ring_top = clone(ring_bottom, delta=vec(0, 0, 20))
ring_top.Label = "RingTop"
# compound of both rings
geom_obj = doc.addObject("Part::Compound", "TheRingOfFire")
geom_obj.Links = [ring_bottom, ring_top]
doc.recompute()
if FreeCAD.GuiUp:
geom_obj.ViewObject.Document.activeView().viewAxonometric()
geom_obj.ViewObject.Document.activeView().fitAll()
# line for centrif axis
sh_axis_line = makeLine(vec(0, 0, 0), vec(0, 0, 31))
axis_line = doc.addObject("Part::Feature", "CentrifAxis")
axis_line.Shape = sh_axis_line
doc.recompute()
if FreeCAD.GuiUp:
axis_line.ViewObject.LineWidth = 5.0
axis_line.ViewObject.LineColor = (1.0, 0.0, 0.0)
# analysis
analysis = ObjectsFem.makeAnalysis(doc, "Analysis")
# solver
if solvertype == "calculix":
solver_obj = ObjectsFem.makeSolverCalculix(doc, "SolverCalculiX")
elif solvertype == "ccxtools":
solver_obj = ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiXccxTools")
solver_obj.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_obj.AnalysisType = "static"
solver_obj.GeometricalNonlinearity = "linear"
solver_obj.ThermoMechSteadyState = False
solver_obj.MatrixSolverType = "default"
solver_obj.IterationsControlParameterTimeUse = False
solver_obj.SplitInputWriter = False
analysis.addObject(solver_obj)
# materials
material_obj_scotty = ObjectsFem.makeMaterialSolid(doc, "Steel_Scotty")
mat = material_obj_scotty.Material
mat["Name"] = "Steel_Scotty"
mat["YoungsModulus"] = "210000 MPa"
mat["PoissonRatio"] = "0.30"
mat["Density"] = "4000 kg/m^3"
material_obj_scotty.Material = mat
material_obj_scotty.References = [(ring_bottom, "Solid1")]
analysis.addObject(material_obj_scotty)
material_obj_std = ObjectsFem.makeMaterialSolid(doc, "Steel_Std")
mat = material_obj_std.Material
mat["Name"] = "Steel_Std"
mat["YoungsModulus"] = "210000 MPa"
mat["PoissonRatio"] = "0.30"
mat["Density"] = "8000 kg/m^3"
material_obj_std.Material = mat
material_obj_std.References = [(ring_top, "Solid1")]
analysis.addObject(material_obj_std)
# constraint fixed
con_fixed = ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
con_fixed.References = [(geom_obj, ("Face4", "Face12"))]
analysis.addObject(con_fixed)
# constraint centrif
con_centrif = ObjectsFem.makeConstraintCentrif(doc, "ConstraintCentrif")
con_centrif.RotationFrequency = "100 Hz"
con_centrif.RotationAxis = [(axis_line, "Edge1")]
analysis.addObject(con_centrif)
# mesh
from .meshes.mesh_constraint_centrif_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.Part = geom_obj
femmesh_obj.SecondOrderLinear = False
femmesh_obj.CharacteristicLengthMax = "5.0 mm"
doc.recompute()
return doc