/
buckling_platebuckling.py
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/
buckling_platebuckling.py
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# ***************************************************************************
# * Copyright (c) 2021 Bernd Hahnebach <bernd@bimstatik.org> *
# * *
# * This file is part of the FreeCAD CAx development system. *
# * *
# * This program is free software; you can redistribute it and/or modify *
# * it under the terms of the GNU Lesser General Public License (LGPL) *
# * as published by the Free Software Foundation; either version 2 of *
# * the License, or (at your option) any later version. *
# * for detail see the LICENCE text file. *
# * *
# * This program is distributed in the hope that it will be useful, *
# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
# * GNU Library General Public License for more details. *
# * *
# * You should have received a copy of the GNU Library General Public *
# * License along with this program; if not, write to the Free Software *
# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
# * USA *
# * *
# ***************************************************************************
# to run the example use:
"""
from femexamples.buckling_platebuckling import setup
setup()
"""
# Forum discussion
# https://forum.freecadweb.org/viewtopic.php?f=18&t=20217&start=110#p509935
import FreeCAD
import Fem
import ObjectsFem
mesh_name = "Mesh" # needs to be Mesh to work with unit tests
def init_doc(doc=None):
if doc is None:
doc = FreeCAD.newDocument()
return doc
def get_information():
return {
"name": "Plate Buckling",
"meshtype": "face",
"meshelement": "Tria6",
"constraints": ["displacement", "force"],
"solvers": ["calculix"],
"material": "solid",
"equation": "buckling"
}
def setup(doc=None, solvertype="ccxtools"):
# init FreeCAD document
if doc is None:
doc = init_doc()
# geometric object
geom_obj = doc.addObject("Part::Plane", "Plate")
geom_obj.Width = 6000
geom_obj.Length = 8000
doc.recompute()
if FreeCAD.GuiUp:
geom_obj.ViewObject.Document.activeView().viewAxonometric()
geom_obj.ViewObject.Document.activeView().fitAll()
# analysis
analysis = ObjectsFem.makeAnalysis(doc, "Analysis")
# solver
if solvertype == "calculix":
solver_obj = ObjectsFem.makeSolverCalculix(doc, "SolverCalculiX")
elif solvertype == "ccxtools":
solver_obj = ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiXccxTools")
solver_obj.WorkingDir = u""
else:
FreeCAD.Console.PrintWarning(
"Not known or not supported solver type: {}. "
"No solver object was created.\n".format(solvertype)
)
if solvertype == "calculix" or solvertype == "ccxtools":
solver_obj.SplitInputWriter = False
solver_obj.AnalysisType = "buckling"
solver_obj.BucklingFactors = 10
solver_obj.GeometricalNonlinearity = "linear"
solver_obj.ThermoMechSteadyState = False
solver_obj.MatrixSolverType = "default"
solver_obj.IterationsControlParameterTimeUse = False
solver_obj.BucklingFactors = 1
analysis.addObject(solver_obj)
# shell thickness
thickness_obj = ObjectsFem.makeElementGeometry2D(doc, 50, 'Thickness')
analysis.addObject(thickness_obj)
# material
material_obj = ObjectsFem.makeMaterialSolid(doc, "Steel")
mat = material_obj.Material
mat["Name"] = "CalculiX-Steel"
mat["YoungsModulus"] = "210000 MPa"
mat["PoissonRatio"] = "0.30"
material_obj.Material = mat
analysis.addObject(material_obj)
# constraints displacement
con_disp_x = ObjectsFem.makeConstraintDisplacement(doc, "ConstraintDisplacement_X")
con_disp_x.References = [(geom_obj, "Edge1")]
con_disp_x.xFix = True
con_disp_x.xFree = False
analysis.addObject(con_disp_x)
con_disp_y = ObjectsFem.makeConstraintDisplacement(doc, "ConstraintDisplacement_Y")
con_disp_y.References = [(geom_obj, "Vertex1")]
con_disp_y.yFix = True
con_disp_y.yFree = False
analysis.addObject(con_disp_y)
con_disp_z = ObjectsFem.makeConstraintDisplacement(doc, "ConstraintDisplacement_Z")
con_disp_z.References = [
(geom_obj, "Edge1"),
(geom_obj, "Edge2"),
(geom_obj, "Edge3"),
(geom_obj, "Edge4"),
]
con_disp_z.zFix = True
con_disp_z.zFree = False
analysis.addObject(con_disp_z)
# constraint force
con_force = ObjectsFem.makeConstraintForce(doc, "ConstraintForce")
con_force.References = [(geom_obj, "Edge3")]
con_force.Force = 17162160 # 17'162.16 N
con_force.Reversed = True
con_force.Direction = (geom_obj, ["Edge2"])
analysis.addObject(con_force)
# mesh
from .meshes.mesh_buckling_plate_tria6 import create_nodes, create_elements
fem_mesh = Fem.FemMesh()
control = create_nodes(fem_mesh)
if not control:
FreeCAD.Console.PrintError("Error on creating nodes.\n")
control = create_elements(fem_mesh)
if not control:
FreeCAD.Console.PrintError("Error on creating elements.\n")
femmesh_obj = analysis.addObject(ObjectsFem.makeMeshGmsh(doc, mesh_name))[0]
femmesh_obj.FemMesh = fem_mesh
femmesh_obj.Part = geom_obj
femmesh_obj.SecondOrderLinear = False
femmesh_obj.CharacteristicLengthMax = "300.0 mm"
femmesh_obj.ElementDimension = "2D"
doc.recompute()
return doc