206 lines
7.4 KiB
Python
206 lines
7.4 KiB
Python
# ***************************************************************************
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# * Copyright (c) 2020 Bernd Hahnebach <bernd@bimstatik.org> *
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# * Copyright (c) 2020 Sudhanshu Dubey <sudhanshu.thethunder@gmail.com *
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# * *
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# * This file is part of the FreeCAD CAx development system. *
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# * *
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# * This program is free software; you can redistribute it and/or modify *
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# * it under the terms of the GNU Lesser General Public License (LGPL) *
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# * as published by the Free Software Foundation; either version 2 of *
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# * the License, or (at your option) any later version. *
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# * for detail see the LICENCE text file. *
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# * *
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# * This program is distributed in the hope that it will be useful, *
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# * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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# * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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# * GNU Library General Public License for more details. *
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# * *
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# * You should have received a copy of the GNU Library General Public *
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# * License along with this program; if not, write to the Free Software *
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# * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 *
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# * USA *
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# * *
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# ***************************************************************************
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import FreeCAD
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from FreeCAD import Rotation
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from FreeCAD import Vector
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import Part
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import Fem
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import ObjectsFem
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from . import manager
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from .manager import get_meshname
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from .manager import init_doc
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def get_information():
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return {
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"name": "Constraint Contact Solid Solid",
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"meshtype": "solid",
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"meshelement": "Tet10",
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"constraints": ["fixed", "pressure", "contact"],
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"solvers": ["ccxtools"],
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"material": "solid",
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"equations": ["mechanical"],
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}
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def get_explanation(header=""):
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return (
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header
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+ """
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To run the example from Python console use:
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from femexamples.constraint_contact_solid_solid import setup
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setup()
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See forum topic post:
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https://forum.freecad.org/viewtopic.php?f=18&t=20276
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constraint contact for solid to solid mesh
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"""
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)
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def setup(doc=None, solvertype="ccxtools"):
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# init FreeCAD document
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if doc is None:
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doc = init_doc()
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# explanation object
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# just keep the following line and change text string in get_explanation method
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manager.add_explanation_obj(doc, get_explanation(manager.get_header(get_information())))
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# geometric objects
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# bottom box
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bottom_box_obj = doc.addObject("Part::Box", "BottomBox")
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bottom_box_obj.Length = 100
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bottom_box_obj.Width = 25
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bottom_box_obj.Height = 500
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bottom_box_obj.Placement = FreeCAD.Placement(
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Vector(186, 0, -247),
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Rotation(0, 0, 0),
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Vector(0, 0, 0),
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)
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doc.recompute()
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# top half cylinder, https://forum.freecad.org/viewtopic.php?f=18&t=43001#p366111
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top_halfcyl_obj = doc.addObject("Part::Cylinder", "TopHalfCylinder")
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top_halfcyl_obj.Radius = 30
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top_halfcyl_obj.Height = 500
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top_halfcyl_obj.Angle = 180
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top_halfcyl_sh = Part.getShape(top_halfcyl_obj, "", needSubElement=False, refine=True)
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top_halfcyl_obj.Shape = top_halfcyl_sh
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top_halfcyl_obj.Placement = FreeCAD.Placement(
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Vector(0, -42, 0),
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Rotation(0, 90, 0),
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Vector(0, 0, 0),
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)
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doc.recompute()
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# all geom fusion
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geom_obj = doc.addObject("Part::MultiFuse", "AllGeomFusion")
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geom_obj.Shapes = [bottom_box_obj, top_halfcyl_obj]
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geom_obj.Refine = True
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if FreeCAD.GuiUp:
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bottom_box_obj.ViewObject.hide()
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top_halfcyl_obj.ViewObject.hide()
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doc.recompute()
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if FreeCAD.GuiUp:
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geom_obj.ViewObject.Document.activeView().viewAxonometric()
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geom_obj.ViewObject.Document.activeView().fitAll()
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# analysis
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analysis = ObjectsFem.makeAnalysis(doc, "Analysis")
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# solver
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if solvertype == "ccxtools":
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solver_obj = ObjectsFem.makeSolverCalculiXCcxTools(doc, "CalculiXCcxTools")
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solver_obj.WorkingDir = ""
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else:
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FreeCAD.Console.PrintWarning(
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"Unknown or unsupported solver type: {}. "
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"No solver object was created.\n".format(solvertype)
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)
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if solvertype == "ccxtools":
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solver_obj.AnalysisType = "static"
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solver_obj.GeometricalNonlinearity = "linear"
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solver_obj.ThermoMechSteadyState = False
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solver_obj.MatrixSolverType = "default"
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solver_obj.IterationsControlParameterTimeUse = False
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solver_obj.SplitInputWriter = False
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"""
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# solver parameter from fandaL, but they are not needed (see forum topic)
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solver_obj.IterationsControlParameterTimeUse = True
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solver_obj.IterationsControlParameterCutb = '0.25,0.5,0.75,0.85,,,1.5,'
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solver_obj.IterationsControlParameterIter = '4,8,9,200,10,400,,200,,'
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solver_obj.IterationsUserDefinedTimeStepLength = True
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solver_obj.TimeInitialStep = 0.1
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solver_obj.TimeEnd = 1.0
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solver_obj.IterationsUserDefinedIncrementations = True # parameter DIRECT
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"""
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analysis.addObject(solver_obj)
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# material
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material_obj = ObjectsFem.makeMaterialSolid(doc, "MechanicalMaterial")
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mat = material_obj.Material
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mat["Name"] = "Steel-Generic"
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mat["YoungsModulus"] = "200000 MPa"
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mat["PoissonRatio"] = "0.30"
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material_obj.Material = mat
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analysis.addObject(material_obj)
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# constraint fixed
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con_fixed = ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
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con_fixed.References = [
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(geom_obj, "Face5"),
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(geom_obj, "Face6"),
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(geom_obj, "Face8"),
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(geom_obj, "Face9"),
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]
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analysis.addObject(con_fixed)
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# constraint pressure
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con_pressure = ObjectsFem.makeConstraintPressure(doc, "ConstraintPressure")
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con_pressure.References = [(geom_obj, "Face10")]
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con_pressure.Pressure = "100.0 MPa"
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con_pressure.Reversed = False
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analysis.addObject(con_pressure)
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# constraint contact
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con_contact = ObjectsFem.makeConstraintContact(doc, "ConstraintContact")
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con_contact.References = [
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(geom_obj, "Face7"), # first seems slave face, TODO proof in writer code!
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(geom_obj, "Face3"), # second seems master face, TODO proof in writer code!
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]
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con_contact.Friction = False
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con_contact.Slope = "1000000.0 GPa/m"
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analysis.addObject(con_contact)
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# mesh
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from .meshes.mesh_contact_box_halfcylinder_tetra10 import (
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create_nodes,
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create_elements,
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)
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fem_mesh = Fem.FemMesh()
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control = create_nodes(fem_mesh)
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if not control:
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FreeCAD.Console.PrintError("Error on creating nodes.\n")
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control = create_elements(fem_mesh)
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if not control:
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FreeCAD.Console.PrintError("Error on creating elements.\n")
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femmesh_obj = analysis.addObject(ObjectsFem.makeMeshGmsh(doc, get_meshname()))[0]
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femmesh_obj.FemMesh = fem_mesh
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femmesh_obj.Shape = geom_obj
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femmesh_obj.SecondOrderLinear = False
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doc.recompute()
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return doc
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