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# * Copyright (c) 2020 Bernd Hahnebach <bernd@bimstatik.org> *
# * Copyright (c) 2020 Sudhanshu Dubey <sudhanshu.thethunder@gmail.com *
# * *
# * 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 *
# * *
# ***************************************************************************
import FreeCAD
import Part
from BOPTools import SplitFeatures
import Fem
import ObjectsFem
from . import manager
from .manager import get_meshname
from .manager import init_doc
def get_information():
return {
"name": "Constraint Contact Shell Shell",
"meshtype": "face",
"meshelement": "Tria3",
"constraints": ["displacement", "force", "contact"],
"solvers": ["ccxtools"],
"material": "solid",
"equations": ["mechanical"],
}
def get_explanation(header=""):
return (
header
+ """
To run the example from Python console use:
from femexamples.constraint_contact_shell_shell import setup
setup()
See forum topic post:
https://forum.freecad.org/viewtopic.php?f=18&t=42228
based on https://forum.freecad.org/viewtopic.php?f=18&t=42228#p359488
contact example shell to shell elements
"""
)
def setup(doc=None, solvertype="ccxtools"):
# init FreeCAD document
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())))
# geometric objects
# TODO: turn circle of upper tube to have the line on the other side
# make a boolean fragment of them to be sure there is a mesh point on remesh
# but as long as we do not remesh it works without the boolean fragment too
# tubes
tube_radius = 25
tube_length = 500
sh_lower_circle = Part.Wire(Part.makeCircle(tube_radius))
sh_lower_tube = sh_lower_circle.extrude(FreeCAD.Vector(0, 0, tube_length))
sh_lower_tube.reverse()
lower_tube = doc.addObject("Part::Feature", "Lower_tube")
lower_tube.Shape = sh_lower_tube
sh_upper_circle = Part.Wire(Part.makeCircle(tube_radius))
sh_upper_tube = sh_upper_circle.extrude(FreeCAD.Vector(0, 0, tube_length))
sh_upper_tube.reverse()
upper_tube = doc.addObject("Part::Feature", "Upper_tube")
upper_tube.Shape = sh_upper_tube
upper_tube.Placement = FreeCAD.Placement(
FreeCAD.Vector(-25, 51, 475),
FreeCAD.Rotation(90, 0, 90),
FreeCAD.Vector(0, 0, 0),
)
# point for load
v_force_pt = FreeCAD.Vector(0, 76, 475)
sh_force_point = Part.Vertex(v_force_pt)
force_point = doc.addObject("Part::Feature", "Load_place_point")
force_point.Shape = sh_force_point
if FreeCAD.GuiUp:
force_point.ViewObject.PointSize = 10.0
force_point.ViewObject.PointColor = (1.0, 0.0, 0.0)
# boolean fragment of upper tubo and force point
boolfrag = SplitFeatures.makeBooleanFragments(name="BooleanFragments")
boolfrag.Objects = [upper_tube, force_point]
if FreeCAD.GuiUp:
upper_tube.ViewObject.hide()
# compound out of bool frag and lower tube
geom_obj = doc.addObject("Part::Compound", "AllGeomCompound")
geom_obj.Links = [boolfrag, lower_tube]
doc.recompute()
if FreeCAD.GuiUp:
geom_obj.ViewObject.Document.activeView().viewAxonometric()
geom_obj.ViewObject.Document.activeView().fitAll()
# line for load direction
sh_load_line = Part.makeLine(v_force_pt, FreeCAD.Vector(0, 150, 475))
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)
# 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.BeamShellResultOutput3D = True
solver_obj.GeometricalNonlinearity = "linear" # really?
# TODO iterations parameter !!!
solver_obj.ThermoMechSteadyState = False
solver_obj.MatrixSolverType = "default"
solver_obj.IterationsControlParameterTimeUse = False
solver_obj.SplitInputWriter = False
analysis.addObject(solver_obj)
# shell thickness
shell_thick = ObjectsFem.makeElementGeometry2D(doc, 0.5, "ShellThickness")
analysis.addObject(shell_thick)
# material
material_obj = ObjectsFem.makeMaterialSolid(doc, "MechanicalMaterial")
mat = material_obj.Material
mat["Name"] = "AlCuMgPb"
mat["YoungsModulus"] = "72000 MPa"
mat["PoissonRatio"] = "0.30"
material_obj.Material = mat
analysis.addObject(material_obj)
# constraint displacement
con_displacement = ObjectsFem.makeConstraintDisplacement(doc, "ConstraintDisplacement")
con_displacement.References = [
(lower_tube, "Edge2"),
(upper_tube, "Edge3"),
]
con_displacement.xFree = False
con_displacement.yFree = False
con_displacement.zFree = False
analysis.addObject(con_displacement)
# constraint force
con_force = ObjectsFem.makeConstraintForce(doc, "ConstraintForce")
# TODO use point of tube boolean fragment
con_force.References = [(force_point, "Vertex1")]
con_force.Force = "5000.0 N"
con_force.Direction = (load_line, ["Edge1"])
con_force.Reversed = True
analysis.addObject(con_force)
# constraint contact
con_contact = ObjectsFem.makeConstraintContact(doc, "ConstraintContact")
con_contact.References = [
(lower_tube, "Face1"),
(upper_tube, "Face1"),
]
con_contact.Friction = False
con_contact.Slope = "1000000.0 GPa/m"
analysis.addObject(con_contact)
# mesh
from .meshes.mesh_contact_tube_tube_tria3 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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