198 lines
7.1 KiB
Python
198 lines
7.1 KiB
Python
# ***************************************************************************
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# * Copyright (c) 2021 Bernd Hahnebach <bernd@bimstatik.org> *
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# * *
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# * This file is part of the FreeCAD CAx development system. *
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# * *
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# * This program is free software; you can redistribute it and/or modify *
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# * it under the terms of the GNU Lesser General Public License (LGPL) *
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# * as published by the Free Software Foundation; either version 2 of *
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# * the License, or (at your option) any later version. *
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# * for detail see the LICENCE text file. *
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# * *
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# * This program is distributed in the hope that it will be useful, *
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# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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# * GNU Library General Public License for more details. *
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# * *
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# * You should have received a copy of the GNU Library General Public *
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# * License along with this program; if not, write to the Free Software *
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# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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# * USA *
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# * *
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# ***************************************************************************
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import FreeCAD
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from FreeCAD import Vector as vec
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from BasicShapes import Shapes
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from Draft import clone
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from Part import makeLine
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import Fem
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import ObjectsFem
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from . import manager
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from .manager import get_meshname
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from .manager import init_doc
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def get_information():
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return {
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"name": "Constraint Centrif",
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"meshtype": "solid",
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"meshelement": "Tet10",
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"constraints": ["centrif", "fixed"],
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"solvers": ["calculix", "ccxtools"],
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"material": "multimaterial",
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"equation": "mechanical"
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}
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def get_explanation(header=""):
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return header + """
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To run the example from Python console use:
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from femexamples.constraint_centrif import setup
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setup()
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See forum topic post:
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https://forum.freecadweb.org/viewtopic.php?f=18&t=57770
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constraint centrif, concerning CENTRIF label from ccx's *DLOAD card
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"""
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def setup(doc=None, solvertype="ccxtools"):
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# init FreeCAD document
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if doc is None:
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doc = init_doc()
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# explanation object
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# just keep the following line and change text string in get_explanation method
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manager.add_explanation_obj(doc, get_explanation(manager.get_header(get_information())))
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# geometric objects
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# ring
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stiffener = doc.addObject("Part::Box", "Stiffener")
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stiffener.Length = 10
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stiffener.Width = 200
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stiffener.Height = 10
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stiffener.Placement.Base = (-5, -100, 0)
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circumference = Shapes.addTube(doc, "Circumference")
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circumference.Height = 10.0
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circumference.InnerRadius = 97.5
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circumference.OuterRadius = 102.5
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doc.recompute()
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fusion = doc.addObject("Part::MultiFuse", "Fusion")
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fusion.Shapes = [stiffener, circumference]
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doc.recompute()
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centerhole = doc.addObject("Part::Cylinder", "CenterHole")
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centerhole.Radius = 3
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centerhole.Height = 20
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doc.recompute()
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ring_bottom = doc.addObject("Part::Cut", "RingBottom")
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ring_bottom.Base = fusion
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ring_bottom.Tool = centerhole
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doc.recompute()
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# standard ring
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ring_top = clone(ring_bottom, delta=vec(0, 0, 20))
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ring_top.Label = "RingTop"
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# compound of both rings
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geom_obj = doc.addObject("Part::Compound", "TheRingOfFire")
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geom_obj.Links = [ring_bottom, ring_top]
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doc.recompute()
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if FreeCAD.GuiUp:
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geom_obj.ViewObject.Document.activeView().viewAxonometric()
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geom_obj.ViewObject.Document.activeView().fitAll()
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# line for centrif axis
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sh_axis_line = makeLine(vec(0, 0, 0), vec(0, 0, 31))
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axis_line = doc.addObject("Part::Feature", "CentrifAxis")
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axis_line.Shape = sh_axis_line
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doc.recompute()
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if FreeCAD.GuiUp:
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axis_line.ViewObject.LineWidth = 5.0
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axis_line.ViewObject.LineColor = (1.0, 0.0, 0.0)
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# analysis
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analysis = ObjectsFem.makeAnalysis(doc, "Analysis")
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# solver
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if solvertype == "calculix":
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solver_obj = ObjectsFem.makeSolverCalculix(doc, "SolverCalculiX")
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elif solvertype == "ccxtools":
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solver_obj = ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiXccxTools")
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solver_obj.WorkingDir = u""
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else:
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FreeCAD.Console.PrintWarning(
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"Not known or not supported solver type: {}. "
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"No solver object was created.\n".format(solvertype)
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)
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if solvertype == "calculix" or solvertype == "ccxtools":
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solver_obj.AnalysisType = "static"
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solver_obj.GeometricalNonlinearity = "linear"
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solver_obj.ThermoMechSteadyState = False
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solver_obj.MatrixSolverType = "default"
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solver_obj.IterationsControlParameterTimeUse = False
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solver_obj.SplitInputWriter = False
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analysis.addObject(solver_obj)
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# materials
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material_obj_scotty = ObjectsFem.makeMaterialSolid(doc, "Steel_Scotty")
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mat = material_obj_scotty.Material
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mat["Name"] = "Steel_Scotty"
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mat["YoungsModulus"] = "210000 MPa"
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mat["PoissonRatio"] = "0.30"
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mat["Density"] = "4000 kg/m^3"
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material_obj_scotty.Material = mat
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material_obj_scotty.References = [(ring_bottom, "Solid1")]
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analysis.addObject(material_obj_scotty)
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material_obj_std = ObjectsFem.makeMaterialSolid(doc, "Steel_Std")
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mat = material_obj_std.Material
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mat["Name"] = "Steel_Std"
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mat["YoungsModulus"] = "210000 MPa"
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mat["PoissonRatio"] = "0.30"
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mat["Density"] = "8000 kg/m^3"
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material_obj_std.Material = mat
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material_obj_std.References = [(ring_top, "Solid1")]
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analysis.addObject(material_obj_std)
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# constraint fixed
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con_fixed = ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
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con_fixed.References = [(geom_obj, ("Face4", "Face12"))]
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analysis.addObject(con_fixed)
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# constraint centrif
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con_centrif = ObjectsFem.makeConstraintCentrif(doc, "ConstraintCentrif")
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con_centrif.RotationFrequency = "100 Hz"
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con_centrif.RotationAxis = [(axis_line, "Edge1")]
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analysis.addObject(con_centrif)
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# mesh
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from .meshes.mesh_constraint_centrif_tetra10 import create_nodes, create_elements
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fem_mesh = Fem.FemMesh()
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control = create_nodes(fem_mesh)
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if not control:
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FreeCAD.Console.PrintError("Error on creating nodes.\n")
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control = create_elements(fem_mesh)
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if not control:
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FreeCAD.Console.PrintError("Error on creating elements.\n")
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femmesh_obj = analysis.addObject(ObjectsFem.makeMeshGmsh(doc, get_meshname()))[0]
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femmesh_obj.FemMesh = fem_mesh
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femmesh_obj.Part = geom_obj
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femmesh_obj.SecondOrderLinear = False
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femmesh_obj.CharacteristicLengthMax = "5.0 mm"
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doc.recompute()
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return doc
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