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constraint_contact_solid_solid.py
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constraint_contact_solid_solid.py
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# ***************************************************************************
# * 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_contact_solid_solid import setup
setup()
"""
# constraint contact for solid to solid mesh
# https://forum.freecadweb.org/viewtopic.php?f=18&t=20276
import FreeCAD
from FreeCAD import Rotation
from FreeCAD import Vector
import Fem
import ObjectsFem
import Part
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(doc=None, solvertype="ccxtools"):
# setup model
if doc is None:
doc = init_doc()
# geometry objects
# bottom box
bottom_box_obj = doc.addObject("Part::Box", "BottomBox")
bottom_box_obj.Length = 100
bottom_box_obj.Width = 25
bottom_box_obj.Height = 500
bottom_box_obj.Placement = FreeCAD.Placement(
Vector(186, 0, -247),
Rotation(0, 0, 0),
Vector(0, 0, 0),
)
doc.recompute()
# top half cylinder, https://forum.freecadweb.org/viewtopic.php?f=18&t=43001#p366111
top_halfcyl_obj = doc.addObject("Part::Cylinder", "TopHalfCylinder")
top_halfcyl_obj.Radius = 30
top_halfcyl_obj.Height = 500
top_halfcyl_obj.Angle = 180
top_halfcyl_sh = Part.getShape(top_halfcyl_obj, '', needSubElement=False, refine=True)
top_halfcyl_obj.Shape = top_halfcyl_sh
top_halfcyl_obj.Placement = FreeCAD.Placement(
Vector(0, -42, 0),
Rotation(0, 90, 0),
Vector(0, 0, 0),
)
doc.recompute()
# all geom fusion
geom_obj = doc.addObject("Part::MultiFuse", "AllGeomFusion")
geom_obj.Shapes = [bottom_box_obj, top_halfcyl_obj]
if FreeCAD.GuiUp:
bottom_box_obj.ViewObject.hide()
top_halfcyl_obj.ViewObject.hide()
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_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 = "static"
solver_object.GeometricalNonlinearity = "linear"
solver_object.ThermoMechSteadyState = False
solver_object.MatrixSolverType = "default"
solver_object.IterationsControlParameterTimeUse = False
solver_object.SplitInputWriter = False
"""
# solver parameter from fandaL, but they are not needed (see forum topic)
solver_object.IterationsControlParameterTimeUse = True
solver_object.IterationsControlParameterCutb = '0.25,0.5,0.75,0.85,,,1.5,'
solver_object.IterationsControlParameterIter = '4,8,9,200,10,400,,200,,'
solver_object.IterationsUserDefinedTimeStepLength = True
solver_object.TimeInitialStep = 0.1
solver_object.TimeEnd = 1.0
solver_object.IterationsUserDefinedIncrementations = True # parameter DIRECT
"""
# material
material_obj = analysis.addObject(
ObjectsFem.makeMaterialSolid(doc, "MechanicalMaterial")
)[0]
mat = material_obj.Material
mat["Name"] = "Steel-Generic"
mat["YoungsModulus"] = "200000 MPa"
mat["PoissonRatio"] = "0.30"
material_obj.Material = mat
analysis.addObject(material_obj)
# constraint fixed
con_fixed = analysis.addObject(
ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
)[0]
con_fixed.References = [
(geom_obj, "Face5"),
(geom_obj, "Face6"),
(geom_obj, "Face8"),
(geom_obj, "Face9"),
]
# constraint pressure
con_pressure = analysis.addObject(
ObjectsFem.makeConstraintPressure(doc, name="ConstraintPressure")
)[0]
con_pressure.References = [(geom_obj, "Face10")]
con_pressure.Pressure = 100.0 # Pa ? = 100 Mpa ?
con_pressure.Reversed = False
# constraint contact
con_contact = doc.Analysis.addObject(
ObjectsFem.makeConstraintContact(doc, name="ConstraintContact")
)[0]
con_contact.References = [
(geom_obj, "Face7"), # first seams slave face, TODO proof in writer code!
(geom_obj, "Face3"), # second seams master face, TODO proof in writer code!
]
con_contact.Friction = 0.0
con_contact.Slope = 1000000.0 # contact stiffness 1000000.0 kg/(mm*s^2)
# mesh
from .meshes.mesh_contact_box_halfcylinder_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