/
boxanalysis.py
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/
boxanalysis.py
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# ***************************************************************************
# * Copyright (c) 2019 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. *
# * *
# * FreeCAD 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 FreeCAD; 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 import boxanalysis as box
box.setup_base()
box.setup_static()
box.setup_frequency()
"""
import FreeCAD
import ObjectsFem
import Fem
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 setup_base(doc=None, solvertype="ccxtools"):
# setup box base model
if doc is None:
doc = init_doc()
# part
box_obj = doc.addObject("Part::Box", "Box")
box_obj.Height = box_obj.Width = box_obj.Length = 10
doc.recompute()
if FreeCAD.GuiUp:
import FreeCADGui
FreeCADGui.ActiveDocument.activeView().viewAxonometric()
FreeCADGui.SendMsgToActiveView("ViewFit")
# analysis
analysis = ObjectsFem.makeAnalysis(doc, "Analysis")
# material
material_object = analysis.addObject(
ObjectsFem.makeMaterialSolid(doc, "MechanicalMaterial")
)[0]
mat = material_object.Material
mat["Name"] = "Steel-Generic"
mat["YoungsModulus"] = "200000 MPa"
mat["PoissonRatio"] = "0.30"
mat["Density"] = "7900 kg/m^3"
material_object.Material = mat
# mesh
from .meshes.mesh_boxanalysis_tetra10 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(
doc.addObject("Fem::FemMeshObject", mesh_name)
)[0]
femmesh_obj.FemMesh = fem_mesh
doc.recompute()
return doc
def setup_static(doc=None, solvertype="ccxtools"):
# setup box static, add a fixed, force and a pressure constraint
doc = setup_base(doc, solvertype)
box_obj = doc.Box
analysis = doc.Analysis
# solver
if solvertype == "calculix":
solver_object = analysis.addObject(
ObjectsFem.makeSolverCalculix(doc, "SolverCalculiX")
)[0]
elif solvertype == "ccxtools":
solver_object = analysis.addObject(
ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiXccxTools")
)[0]
solver_object.WorkingDir = u""
elif solvertype == "elmer":
analysis.addObject(ObjectsFem.makeSolverElmer(doc, "SolverElmer"))
elif solvertype == "z88":
analysis.addObject(ObjectsFem.makeSolverZ88(doc, "SolverZ88"))
if solvertype == "calculix" or solvertype == "ccxtools":
solver_object.SplitInputWriter = False
solver_object.AnalysisType = "static"
solver_object.GeometricalNonlinearity = "linear"
solver_object.ThermoMechSteadyState = False
solver_object.MatrixSolverType = "default"
solver_object.IterationsControlParameterTimeUse = False
# fixed_constraint
fixed_constraint = analysis.addObject(
ObjectsFem.makeConstraintFixed(doc, name="FemConstraintFixed")
)[0]
fixed_constraint.References = [(box_obj, "Face1")]
# force_constraint
force_constraint = analysis.addObject(
ObjectsFem.makeConstraintForce(doc, name="FemConstraintForce")
)[0]
force_constraint.References = [(box_obj, "Face6")]
force_constraint.Force = 40000.0
force_constraint.Direction = (box_obj, ["Edge5"])
force_constraint.Reversed = True
# pressure_constraint
pressure_constraint = analysis.addObject(
ObjectsFem.makeConstraintPressure(doc, name="FemConstraintPressure")
)[0]
pressure_constraint.References = [(box_obj, "Face2")]
pressure_constraint.Pressure = 1000.0
pressure_constraint.Reversed = False
doc.recompute()
return doc
def setup_frequency(doc=None, solvertype="ccxtools"):
# setup box frequency, change solver attributes
doc = setup_base(doc, solvertype)
analysis = doc.Analysis
# solver
if solvertype == "calculix":
solver_object = analysis.addObject(
ObjectsFem.makeSolverCalculix(doc, "SolverCalculiX")
)[0]
elif solvertype == "ccxtools":
solver_object = analysis.addObject(
ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiXccxTools")
)[0]
solver_object.WorkingDir = u""
if solvertype == "calculix" or solvertype == "ccxtools":
solver_object.AnalysisType = "frequency"
solver_object.GeometricalNonlinearity = "linear"
solver_object.ThermoMechSteadyState = False
solver_object.MatrixSolverType = "default"
solver_object.IterationsControlParameterTimeUse = False
solver_object.EigenmodesCount = 10
solver_object.EigenmodeHighLimit = 1000000.0
solver_object.EigenmodeLowLimit = 0.01
doc.recompute()
return doc