167 lines
6.1 KiB
Python
167 lines
6.1 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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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": "Plate Buckling",
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"meshtype": "face",
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"meshelement": "Tria6",
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"constraints": ["displacement", "force"],
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"solvers": ["calculix", "ccxtools"],
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"material": "solid",
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"equation": "buckling"
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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=20217&start=110#p509935
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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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geom_obj = doc.addObject("Part::Plane", "Plate")
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geom_obj.Width = 6000
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geom_obj.Length = 8000
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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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# 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.SplitInputWriter = False
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solver_obj.AnalysisType = "buckling"
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solver_obj.BucklingFactors = 10
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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.BucklingFactors = 1
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analysis.addObject(solver_obj)
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# shell thickness
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thickness_obj = ObjectsFem.makeElementGeometry2D(doc, 50, 'Thickness')
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analysis.addObject(thickness_obj)
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# material
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material_obj = ObjectsFem.makeMaterialSolid(doc, "Steel")
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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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# constraints displacement
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con_disp_x = ObjectsFem.makeConstraintDisplacement(doc, "ConstraintDisplacement_X")
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con_disp_x.References = [(geom_obj, "Edge1")]
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con_disp_x.xFix = True
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con_disp_x.xFree = False
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analysis.addObject(con_disp_x)
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con_disp_y = ObjectsFem.makeConstraintDisplacement(doc, "ConstraintDisplacement_Y")
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con_disp_y.References = [(geom_obj, "Vertex1")]
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con_disp_y.yFix = True
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con_disp_y.yFree = False
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analysis.addObject(con_disp_y)
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con_disp_z = ObjectsFem.makeConstraintDisplacement(doc, "ConstraintDisplacement_Z")
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con_disp_z.References = [
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(geom_obj, "Edge1"),
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(geom_obj, "Edge2"),
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(geom_obj, "Edge3"),
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(geom_obj, "Edge4"),
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]
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con_disp_z.zFix = True
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con_disp_z.zFree = False
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analysis.addObject(con_disp_z)
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# constraint force
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con_force = ObjectsFem.makeConstraintForce(doc, "ConstraintForce")
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con_force.References = [(geom_obj, "Edge3")]
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con_force.Force = 17162160 # 17'162.16 N
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con_force.Reversed = True
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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_buckling_plate_tria6 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 = "300.0 mm"
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femmesh_obj.ElementDimension = "2D"
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doc.recompute()
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return doc
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