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FEM: constraint centrif, add example
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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 * | ||
# * * | ||
# *************************************************************************** | ||
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import FreeCAD | ||
from FreeCAD import Vector as vec | ||
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from BasicShapes import Shapes | ||
from Draft import clone | ||
from Part import makeLine | ||
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import Fem | ||
import ObjectsFem | ||
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from . import manager | ||
from .manager import get_meshname | ||
from .manager import init_doc | ||
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def get_information(): | ||
return { | ||
"name": "Constraint Centrif", | ||
"meshtype": "solid", | ||
"meshelement": "Tet10", | ||
"constraints": ["centrif", "fixed"], | ||
"solvers": ["calculix"], | ||
"material": "multimaterial", | ||
"equation": "mechanical" | ||
} | ||
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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 | ||
""" | ||
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def setup(doc=None, solvertype="ccxtools"): | ||
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# init FreeCAD document | ||
if doc is None: | ||
doc = init_doc() | ||
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# 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()))) | ||
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# 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() | ||
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fusion = doc.addObject("Part::MultiFuse", "Fusion") | ||
fusion.Shapes = [stiffener, circumference] | ||
doc.recompute() | ||
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centerhole = doc.addObject("Part::Cylinder", "CenterHole") | ||
centerhole.Radius = 3 | ||
centerhole.Height = 20 | ||
doc.recompute() | ||
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ring_bottom = doc.addObject("Part::Cut", "RingBottom") | ||
ring_bottom.Base = fusion | ||
ring_bottom.Tool = centerhole | ||
doc.recompute() | ||
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# standard ring | ||
ring_top = clone(ring_bottom, delta=vec(0, 0, 20)) | ||
ring_top.Label = "RingTop" | ||
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# compound of both rings | ||
geom_obj = doc.addObject("Part::Compound", "TheRingOfFire") | ||
geom_obj.Links = [ring_bottom, ring_top] | ||
doc.recompute() | ||
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if FreeCAD.GuiUp: | ||
geom_obj.ViewObject.Document.activeView().viewAxonometric() | ||
geom_obj.ViewObject.Document.activeView().fitAll() | ||
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# 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) | ||
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# analysis | ||
analysis = ObjectsFem.makeAnalysis(doc, "Analysis") | ||
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# 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) | ||
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# 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) | ||
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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) | ||
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# constraint fixed | ||
con_fixed = ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed") | ||
con_fixed.References = [(geom_obj, ("Face4", "Face12"))] | ||
analysis.addObject(con_fixed) | ||
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# constraint centrif | ||
con_centrif = ObjectsFem.makeConstraintCentrif(doc, "ConstraintCentrif") | ||
con_centrif.RotationFrequency = "100 Hz" | ||
con_centrif.RotationAxis = [(axis_line, "Edge1")] | ||
analysis.addObject(con_centrif) | ||
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# 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" | ||
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doc.recompute() | ||
return doc |
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