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# * Copyright (c) 2020 Sudhanshu Dubey <sudhanshu.thethunder@gmail.com> *
# * Copyright (c) 2020 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.constraint_transform_torque import setup()
setup()
"""
# constraint transform with a constraint force
# https://forum.freecad.org/viewtopic.php?t=19037
# https://forum.freecad.org/viewtopic.php?t=18970
import FreeCAD
import Fem
import ObjectsFem
from Part import makeLine
from . import manager
from .manager import get_meshname
from .manager import init_doc
def get_information():
return {
"name": "Constraint Transform Torque",
"meshtype": "solid",
"meshelement": "Tet10",
"constraints": ["fixed", "force", "transform"],
"solvers": ["ccxtools"],
"material": "solid",
"equations": ["mechanical"],
}
def get_explanation(header=""):
return (
header
+ """
To run the example from Python console use:
from femexamples.constraint_transform_torque import setup
setup()
See forum topic post:
https://forum.freecad.org/viewtopic.php?f=18&t=19037&start=10#p515447
https://forum.freecad.org/viewtopic.php?t=19037
https://forum.freecad.org/viewtopic.php?t=18970
constraint transform with a constraint force
"""
)
def setup(doc=None, solvertype="ccxtools"):
if doc is None:
doc = init_doc()
# explanation object
# just keep the following line and change text string in get_explanation method
manager.add_explanation_obj(doc, get_explanation(manager.get_header(get_information())))
# line for load direction
sh_load_line = makeLine(FreeCAD.Vector(0, 0, 0), FreeCAD.Vector(0, 10, 0))
load_line = doc.addObject("Part::Feature", "Load_direction_line")
load_line.Shape = sh_load_line
doc.recompute()
if FreeCAD.GuiUp:
load_line.ViewObject.LineWidth = 5.0
load_line.ViewObject.LineColor = (1.0, 0.0, 0.0)
# geometry object
# name is important because the other method in this module use obj name
cylinder1 = doc.addObject("Part::Cylinder", "Cylinder1")
cylinder1.Height = "50 mm"
cylinder1.Radius = "5 mm"
cylinder2 = doc.addObject("Part::Cylinder", "Cylinder2")
cylinder2.Height = "50 mm"
cylinder2.Radius = "4 mm"
geom_obj = doc.addObject("Part::Cut", "Cut")
geom_obj.Base = cylinder1
geom_obj.Tool = cylinder2
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 == "ccxtools":
solver_obj = ObjectsFem.makeSolverCalculiXCcxTools(doc, "CalculiXCcxTools")
solver_obj.WorkingDir = ""
else:
FreeCAD.Console.PrintWarning(
"Unknown or unsupported solver type: {}. "
"No solver object was created.\n".format(solvertype)
)
if solvertype == "ccxtools":
solver_obj.AnalysisType = "static"
solver_obj.GeometricalNonlinearity = "linear"
solver_obj.ThermoMechSteadyState = False
solver_obj.MatrixSolverType = "default"
solver_obj.IterationsControlParameterTimeUse = False
solver_obj.SplitInputWriter = False
analysis.addObject(solver_obj)
# material
material_obj = ObjectsFem.makeMaterialSolid(doc, "MechanicalMaterial")
mat = material_obj.Material
mat["Name"] = "Calculix-Steel"
mat["YoungsModulus"] = "210000 MPa"
mat["PoissonRatio"] = "0.30"
material_obj.Material = mat
analysis.addObject(material_obj)
# constraint fixed
con_fixed = ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
con_fixed.References = [(geom_obj, "Face3")]
analysis.addObject(con_fixed)
# constraint force
con_force = ObjectsFem.makeConstraintForce(doc, "ConstraintForce")
con_force.References = [(geom_obj, "Face1")]
con_force.Force = "2500.0 N" # 2.5 kN
con_force.Direction = (load_line, ["Edge1"])
con_force.Reversed = True
analysis.addObject(con_force)
# constraint transform
con_transform = ObjectsFem.makeConstraintTransform(doc, name="ConstraintTransform")
con_transform.References = [(geom_obj, "Face1")]
con_transform.TransformType = "Cylindrical"
analysis.addObject(con_transform)
# mesh
from .meshes.mesh_transform_torque_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(ObjectsFem.makeMeshGmsh(doc, get_meshname()))[0]
femmesh_obj.FemMesh = fem_mesh
femmesh_obj.Shape = geom_obj
femmesh_obj.SecondOrderLinear = False
doc.recompute()
return doc
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