152 lines
5.3 KiB
Python
152 lines
5.3 KiB
Python
# SPDX-License-Identifier: LGPL-2.1-or-later
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# ***************************************************************************
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# * Copyright (c) 2025 Jakub Michalski <jakub.j.michalski[at]gmail.com> *
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# * *
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# * This file is part of FreeCAD. *
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# * *
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# * FreeCAD is free software: you can redistribute it and/or modify it *
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# * under the terms of the GNU Lesser General Public License as *
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# * published by the Free Software Foundation, either version 2.1 of the *
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# * License, or (at your option) any later version. *
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# * *
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# * FreeCAD is distributed in the hope that it will be useful, but *
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# * WITHOUT ANY WARRANTY; without even the implied warranty of *
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# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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# * Lesser General Public License for more details. *
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# * *
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# * You should have received a copy of the GNU Lesser General Public *
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# * License along with FreeCAD. If not, see *
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# * <https://www.gnu.org/licenses/>. *
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# * *
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# ***************************************************************************
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import FreeCAD as App
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import Part
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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": "Rigid body constraint",
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"meshtype": "solid",
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"meshelement": "Tet10",
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"constraints": ["fixed", "rigid body"],
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"solvers": ["ccxtools"],
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"material": "solid",
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"equations": ["mechanical"],
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}
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def get_explanation(header=""):
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return (
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header
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+ """
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To run the example from Python console use:
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from femexamples.ccx_rigid_body import setup
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setup()
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Analytical solution - max xz stress = 2.547 MPa = 2.547e6 Pa
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"""
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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 object
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ellipse = doc.addObject("Part::Ellipse", "Ellipse")
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ellipse.MajorRadius = "100,00 mm"
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ellipse.MinorRadius = "50,00 mm"
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ellipse.Angle1 = "0,00 °"
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ellipse.Angle2 = "360,00 °"
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ellipse.Placement = App.Placement(
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App.Vector(0.00, 0.00, 0.00), App.Rotation(App.Vector(0.00, 0.00, 1.00), 0.00)
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)
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extrude = doc.addObject("Part::Extrusion", "Extrude")
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extrude.Base = ellipse
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extrude.LengthFwd = 1000
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extrude.Solid = True
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ellipse.Visibility = False
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doc.recompute()
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if App.GuiUp:
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extrude.ViewObject.Document.activeView().viewAxonometric()
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extrude.ViewObject.Document.activeView().fitAll()
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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 == "ccxtools":
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solver_obj = ObjectsFem.makeSolverCalculiXCcxTools(doc, "CalculiXCcxTools")
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solver_obj.WorkingDir = ""
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else:
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FreeCAD.Console.PrintWarning(
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"Unknown or unsupported solver type: {}. "
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"No solver object was created.\n".format(solvertype)
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)
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if solvertype == "ccxtools":
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solver_obj.SplitInputWriter = False
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solver_obj.AnalysisType = "static"
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analysis.addObject(solver_obj)
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# material
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material_obj = ObjectsFem.makeMaterialSolid(doc, "MechanicalMaterial")
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mat = material_obj.Material
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mat["Name"] = "CalculiX-Steel"
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mat["YoungsModulus"] = "210000 MPa"
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mat["PoissonRatio"] = "0.30"
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material_obj.Material = mat
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material_obj.References = [(extrude, "Solid1")]
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analysis.addObject(material_obj)
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# constraint fixed
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con_fixed = ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
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con_fixed.References = [(extrude, "Face2")]
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analysis.addObject(con_fixed)
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# constraint rigid body
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con_rb = ObjectsFem.makeConstraintRigidBody(doc, "ConstraintRigidBody")
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con_rb.References = [(extrude, "Face3")]
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con_rb.ReferenceNode = App.Vector(0.000000, 0.000000, 1000.000000)
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con_rb.Rotation = App.Rotation(App.Vector(0.000000, 0.000000, 1.000000), Radian=0.000000)
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con_rb.MomentZ = "1,00 kJ"
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con_rb.RotationalModeZ = "Load"
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analysis.addObject(con_rb)
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# mesh
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femmesh_obj = analysis.addObject(ObjectsFem.makeMeshGmsh(doc, get_meshname()))[0]
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femmesh_obj.Shape = extrude
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femmesh_obj.ElementOrder = "2nd"
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femmesh_obj.CharacteristicLengthMax = "15 mm"
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femmesh_obj.ViewObject.Visibility = False
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# generate the mesh
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from femmesh import gmshtools
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gmsh_mesh = gmshtools.GmshTools(femmesh_obj, analysis)
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try:
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error = gmsh_mesh.create_mesh()
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except Exception:
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error = sys.exc_info()[1]
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FreeCAD.Console.PrintError(f"Unexpected error when creating mesh: {error}\n")
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doc.recompute()
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return doc
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