219 lines
8.1 KiB
Python
219 lines
8.1 KiB
Python
# ***************************************************************************
|
|
# * 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 *
|
|
# * *
|
|
# ***************************************************************************
|
|
|
|
# to run the example use:
|
|
"""
|
|
from femexamples.constraint_contact_shell_shell import setup
|
|
setup()
|
|
|
|
"""
|
|
|
|
# contact example shell to shell elements
|
|
# https://forum.freecadweb.org/viewtopic.php?f=18&t=42228
|
|
# based on https://forum.freecadweb.org/viewtopic.php?f=18&t=42228#p359488
|
|
|
|
import FreeCAD
|
|
|
|
import Fem
|
|
import ObjectsFem
|
|
import Part
|
|
from BOPTools import SplitFeatures
|
|
|
|
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():
|
|
info = {"name": "Constraint Constact Shell Shell",
|
|
"meshtype": "solid",
|
|
"meshelement": "Tria3",
|
|
"constraints": ["fixed", "force", "contact"],
|
|
"solvers": ["calculix"],
|
|
"material": "solid",
|
|
"equation": "mechanical"
|
|
}
|
|
return info
|
|
|
|
|
|
def setup(doc=None, solvertype="ccxtools"):
|
|
# setup model
|
|
|
|
if doc is None:
|
|
doc = init_doc()
|
|
|
|
# geometry 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 == "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""
|
|
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_object.AnalysisType = "static"
|
|
solver_object.BeamShellResultOutput3D = True
|
|
solver_object.GeometricalNonlinearity = "linear" # really?
|
|
# TODO iterations parameter !!!
|
|
solver_object.ThermoMechSteadyState = False
|
|
solver_object.MatrixSolverType = "default"
|
|
solver_object.IterationsControlParameterTimeUse = False
|
|
solver_object.SplitInputWriter = False
|
|
|
|
# shell thickness
|
|
analysis.addObject(ObjectsFem.makeElementGeometry2D(doc, 0.5, 'ShellThickness'))
|
|
|
|
# material
|
|
material_obj = analysis.addObject(
|
|
ObjectsFem.makeMaterialSolid(doc, "MechanicalMaterial")
|
|
)[0]
|
|
mat = material_obj.Material
|
|
mat["Name"] = "AlCuMgPb"
|
|
mat["YoungsModulus"] = "72000 MPa"
|
|
mat["PoissonRatio"] = "0.30"
|
|
material_obj.Material = mat
|
|
analysis.addObject(material_obj)
|
|
|
|
# fixed_constraint
|
|
fixed_constraint = analysis.addObject(
|
|
ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
|
|
)[0]
|
|
fixed_constraint.References = [
|
|
(lower_tube, "Edge2"),
|
|
(upper_tube, "Edge3"),
|
|
]
|
|
|
|
# force_constraint
|
|
force_constraint = doc.Analysis.addObject(
|
|
ObjectsFem.makeConstraintForce(doc, name="ConstraintForce")
|
|
)[0]
|
|
# TODO use point of tube boolean fragment
|
|
force_constraint.References = [(force_point, "Vertex1")]
|
|
force_constraint.Force = 5000.0
|
|
force_constraint.Direction = (load_line, ["Edge1"])
|
|
force_constraint.Reversed = True
|
|
|
|
# contact constraint
|
|
contact_constraint = doc.Analysis.addObject(
|
|
ObjectsFem.makeConstraintContact(doc, name="ConstraintContact")
|
|
)[0]
|
|
contact_constraint.References = [
|
|
(lower_tube, "Face1"),
|
|
(upper_tube, "Face1"),
|
|
]
|
|
contact_constraint.Friction = 0.0
|
|
# contact_constrsh_aint.Slope = "1000000.0 kg/(mm*s^2)" # contact stiffness
|
|
contact_constraint.Slope = 1000000.0 # should be 1000000.0 kg/(mm*s^2)
|
|
|
|
# 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, mesh_name)
|
|
)[0]
|
|
femmesh_obj.FemMesh = fem_mesh
|
|
femmesh_obj.Part = geom_obj
|
|
femmesh_obj.SecondOrderLinear = False
|
|
|
|
doc.recompute()
|
|
return doc
|