199 lines
7.2 KiB
Python
199 lines
7.2 KiB
Python
# ***************************************************************************
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# * Copyright (c) 2020 Sudhanshu Dubey <sudhanshu.thethunder@gmail.com> *
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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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# to run the example use:
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"""
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from femexamples.constraint_transform_beam_hinged import setup
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setup()
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"""
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# Constraint transform on a beam
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# https://forum.freecadweb.org/viewtopic.php?f=18&t=20238#p157643
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import FreeCAD
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from FreeCAD import Rotation
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from FreeCAD import Vector
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import Fem
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import ObjectsFem
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from CompoundTools import CompoundFilter
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mesh_name = "Mesh" # needs to be Mesh to work with unit tests
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def init_doc(doc=None):
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if doc is None:
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doc = FreeCAD.newDocument()
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return doc
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def get_information():
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info = {"name": "Constraint Transform Beam Hinged",
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"meshtype": "solid",
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"meshelement": "Tet10",
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"constraints": ["pressure", "displacement", "transform"],
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"solvers": ["calculix"],
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"material": "solid",
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"equation": "mechanical"
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}
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return info
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def setup(doc=None, solvertype="ccxtools"):
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# setup cylinder base model
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if doc is None:
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doc = init_doc()
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# geometry object
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# name is important because the other method in this module use obj name
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cube = doc.addObject("Part::Box", "Cube")
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cube.Height = "20 mm"
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cube.Length = "100 mm"
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cylinder = doc.addObject("Part::Cylinder", "Cylinder")
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cylinder.Height = "20 mm"
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cylinder.Radius = "6 mm"
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cylinder.Placement = FreeCAD.Placement(
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Vector(10, 12, 10), Rotation(0, 0, 90), Vector(0, 0, 0),
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)
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cut = doc.addObject("Part::Cut", "Cut")
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cut.Base = cube
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cut.Tool = cylinder
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# mirroring
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mirror = doc.addObject("Part::Mirroring", "Mirror")
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mirror.Source = cut
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mirror.Normal = (1, 0, 0)
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mirror.Base = (100, 100, 20)
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# fusing
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fusion = doc.addObject("Part::Fuse", "Fusion")
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fusion.Base = cut
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fusion.Tool = mirror
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fusion.Refine = True
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# compound filter
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geom_obj = CompoundFilter.makeCompoundFilter(name='CompoundFilter')
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geom_obj.Base = fusion
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geom_obj.FilterType = 'window-volume'
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doc.recompute()
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if FreeCAD.GuiUp:
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geom_obj.Base.ViewObject.hide()
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geom_obj.ViewObject.Document.activeView().viewAxonometric()
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geom_obj.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 == "calculix":
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solver_object = analysis.addObject(
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ObjectsFem.makeSolverCalculix(doc, "SolverCalculiX")
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)[0]
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elif solvertype == "ccxtools":
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solver_object = analysis.addObject(
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ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiXccxTools")
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)[0]
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solver_object.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_object.SplitInputWriter = False
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solver_object.AnalysisType = "static"
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solver_object.GeometricalNonlinearity = "linear"
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solver_object.ThermoMechSteadyState = False
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solver_object.MatrixSolverType = "default"
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solver_object.IterationsControlParameterTimeUse = False
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# material
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material_object = analysis.addObject(
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ObjectsFem.makeMaterialSolid(doc, "FemMaterial")
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)[0]
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mat = material_object.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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mat["Density"] = "7900 kg/m^3"
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mat["ThermalExpansionCoefficient"] = "0.012 mm/m/K"
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material_object.Material = mat
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# constraint pressure
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pressure_constraint = analysis.addObject(
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ObjectsFem.makeConstraintPressure(doc, name="FemConstraintPressure")
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)[0]
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pressure_constraint.References = [(geom_obj, "Face8")]
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pressure_constraint.Pressure = 10.0
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pressure_constraint.Reversed = False
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# constraint_displacement
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displacement_constraint = doc.Analysis.addObject(
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ObjectsFem.makeConstraintDisplacement(doc, name="FemConstraintDisplacment")
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)[0]
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displacement_constraint.References = [(geom_obj, "Face4"), (geom_obj, "Face5")]
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displacement_constraint.xFree = False
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displacement_constraint.xFix = True
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# constraint_transform_1
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transform_constraint1 = doc.Analysis.addObject(
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ObjectsFem.makeConstraintTransform(doc, name="FemConstraintTransform1")
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)[0]
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transform_constraint1.References = [(geom_obj, "Face4")]
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transform_constraint1.TransformType = "Cylindrical"
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transform_constraint1.X_rot = 0.0
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transform_constraint1.Y_rot = 0.0
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transform_constraint1.Z_rot = 0.0
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# constraint_transform_2
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transform_constraint2 = doc.Analysis.addObject(
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ObjectsFem.makeConstraintTransform(doc, name="FemConstraintTransform2")
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)[0]
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transform_constraint2.References = [(geom_obj, "Face5")]
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transform_constraint2.TransformType = "Cylindrical"
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transform_constraint2.X_rot = 0.0
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transform_constraint2.Y_rot = 0.0
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transform_constraint2.Z_rot = 0.0
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# mesh
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from .meshes.mesh_transform_beam_hinged_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(
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ObjectsFem.makeMeshGmsh(doc, mesh_name)
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)[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 = '7 mm'
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doc.recompute()
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return doc
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