205 lines
7.4 KiB
Python
205 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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# to run the example use:
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"""
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from femexamples.constraint_contact_solid_solid import setup
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setup()
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"""
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# constraint contact for solid to solid mesh
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# https://forum.freecadweb.org/viewtopic.php?f=18&t=20276
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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 Fem
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import ObjectsFem
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import Part
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mesh_name = "Mesh" # needs to be Mesh to work with unit tests
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def init_doc(doc=None):
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if doc is None:
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doc = FreeCAD.newDocument()
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return doc
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def get_information():
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info = {"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": ["calculix"],
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"material": "solid",
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"equation": "mechanical"
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}
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return info
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def setup(doc=None, solvertype="ccxtools"):
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# setup model
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if doc is None:
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doc = init_doc()
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# geometry 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.freecadweb.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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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 == "calculix":
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solver_object = analysis.addObject(
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ObjectsFem.makeSolverCalculix(doc, "SolverCalculiX")
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)[0]
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elif solvertype == "ccxtools":
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solver_object = analysis.addObject(
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ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiXccxTools")
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)[0]
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solver_object.WorkingDir = u""
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else:
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FreeCAD.Console.PrintWarning(
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"Not known or not supported solver type: {}. "
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"No solver object was created.\n".format(solvertype)
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)
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if solvertype == "calculix" or solvertype == "ccxtools":
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solver_object.AnalysisType = "static"
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solver_object.GeometricalNonlinearity = "linear"
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solver_object.ThermoMechSteadyState = False
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solver_object.MatrixSolverType = "default"
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solver_object.IterationsControlParameterTimeUse = False
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solver_object.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_object.IterationsControlParameterTimeUse = True
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solver_object.IterationsControlParameterCutb = '0.25,0.5,0.75,0.85,,,1.5,'
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solver_object.IterationsControlParameterIter = '4,8,9,200,10,400,,200,,'
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solver_object.IterationsUserDefinedTimeStepLength = True
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solver_object.TimeInitialStep = 0.1
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solver_object.TimeEnd = 1.0
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solver_object.IterationsUserDefinedIncrementations = True # parameter DIRECT
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"""
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# material
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material_obj = analysis.addObject(
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ObjectsFem.makeMaterialSolid(doc, "MechanicalMaterial")
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)[0]
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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 = analysis.addObject(
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ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
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)[0]
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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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# constraint pressure
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con_pressure = analysis.addObject(
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ObjectsFem.makeConstraintPressure(doc, name="ConstraintPressure")
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)[0]
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con_pressure.References = [(geom_obj, "Face10")]
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con_pressure.Pressure = 100.0 # Pa ? = 100 Mpa ?
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con_pressure.Reversed = False
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# constraint contact
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con_contact = doc.Analysis.addObject(
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ObjectsFem.makeConstraintContact(doc, name="ConstraintContact")
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)[0]
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con_contact.References = [
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(geom_obj, "Face7"), # first seams slave face, TODO proof in writer code!
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(geom_obj, "Face3"), # second seams master face, TODO proof in writer code!
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]
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con_contact.Friction = 0.0
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con_contact.Slope = 1000000.0 # contact stiffness 1000000.0 kg/(mm*s^2)
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# mesh
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from .meshes.mesh_contact_box_halfcylinder_tetra10 import create_nodes, create_elements
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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(
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ObjectsFem.makeMeshGmsh(doc, mesh_name)
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)[0]
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femmesh_obj.FemMesh = fem_mesh
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femmesh_obj.Part = 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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