197 lines
7.1 KiB
Python
197 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 BOPTools import SplitFeatures
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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": "Mystran Plate",
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"meshtype": "face",
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"meshelement": "Quad4",
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"constraints": ["fixed", "force"],
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"solvers": ["calculix", "ccxtools", "elmer", "mystran"],
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"material": "solid",
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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.buckling_platebuckling 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=60320&start=10#p517884
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This version here uses some real value for the Young's Modulus
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The CalculiX steel is used
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plate 10 mm x 10 mm * 0.3 mm
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one each mesh node on one edge 100 N tension force
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Does not work on Z88 because Z88 does not support quad4 elements
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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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plate = doc.addObject("Part::Plane", "Plate")
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plate.Width = 10
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plate.Length = 10
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force_pt1 = doc.addObject("Part::Vertex", "ForcePT1")
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force_pt1.X = 10
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force_pt1.Y = 2
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force_pt2 = doc.addObject("Part::Vertex", "ForcePT2")
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force_pt2.X = 10
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force_pt2.Y = 4
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force_pt3 = doc.addObject("Part::Vertex", "ForcePT3")
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force_pt3.X = 10
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force_pt3.Y = 6
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force_pt4 = doc.addObject("Part::Vertex", "ForcePT4")
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force_pt4.X = 10
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force_pt4.Y = 8
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doc.recompute()
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# all geom boolean fragment
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geom_obj = SplitFeatures.makeBooleanFragments(name='ThePointPlate')
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geom_obj.Objects = [plate, force_pt1, force_pt2, force_pt3, force_pt4]
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doc.recompute()
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if FreeCAD.GuiUp:
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plate.ViewObject.hide()
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force_pt1.ViewObject.hide()
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force_pt2.ViewObject.hide()
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force_pt3.ViewObject.hide()
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force_pt4.ViewObject.hide()
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doc.recompute()
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if FreeCAD.GuiUp:
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geom_obj.ViewObject.PointSize = 10
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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_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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elif solvertype == "elmer":
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solver_obj = ObjectsFem.makeSolverElmer(doc, "SolverElmer")
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ObjectsFem.makeEquationElasticity(doc, solver_obj)
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elif solvertype == "mystran":
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solver_obj = ObjectsFem.makeSolverMystran(doc, "SolverMystran")
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elif solvertype == "z88":
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solver_obj = ObjectsFem.makeSolverZ88(doc, "SolverZ88")
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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.SplitInputWriter = False
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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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analysis.addObject(solver_obj)
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# shell thickness
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thickness_obj = ObjectsFem.makeElementGeometry2D(doc, 0.3, 'Thickness')
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analysis.addObject(thickness_obj)
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# material
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material_obj = ObjectsFem.makeMaterialSolid(doc, "FemMaterial")
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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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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 = [(geom_obj, "Edge1")]
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analysis.addObject(con_fixed)
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# constraint force
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con_force = ObjectsFem.makeConstraintForce(doc, "ConstraintForce")
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con_force.References = [
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(geom_obj, "Vertex7"),
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(geom_obj, "Vertex1"),
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(geom_obj, "Vertex2"),
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(geom_obj, "Vertex3"),
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(geom_obj, "Vertex4"),
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(geom_obj, "Vertex8"),
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]
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con_force.Force = 600 # 600 N on six nodes == 100 N/Node
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con_force.Reversed = False
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con_force.Direction = (geom_obj, ["Edge2"])
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analysis.addObject(con_force)
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# mesh
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from .meshes.mesh_plate_mystran_quad4 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 = "1.0 mm"
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femmesh_obj.ElementDimension = "2D"
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femmesh_obj.ElementOrder = "1st"
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doc.recompute()
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return doc
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