278 lines
10 KiB
Python
278 lines
10 KiB
Python
# ***************************************************************************
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# * Copyright (c) 2020 Sudhanshu Dubey <sudhanshu.thethunder@gmail.com> *
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# * Copyright (c) 2020 Bernd Hahnebach <bernd@bimstatik.org> *
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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_section_print import setup
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setup()
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"""
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# constraint section print with volume elements
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# https://forum.freecadweb.org/viewtopic.php?t=43044
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import math
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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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import Sketcher
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from BOPTools.SplitFeatures import makeBooleanFragments
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from BOPTools.SplitFeatures import makeSlice
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from CompoundTools.CompoundFilter import makeCompoundFilter
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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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return {
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"name": "Constraint Section Print",
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"meshtype": "solid",
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"meshelement": "Tet10",
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"constraints": ["section_print", "fixed", "pressure"],
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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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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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# geometric objects
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# the part sketch
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arc_sketch = doc.addObject("Sketcher::SketchObject", "Arc_Sketch")
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arc_sketch.Placement = FreeCAD.Placement(
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Vector(0, 0, 0),
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Rotation(0, 0, 0, 1)
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)
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arc_sketch.MapMode = "Deactivated"
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# not the exact geometry which makes a closed wire
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# exact geometry will be made by the constraints
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# the order is important for the constraints definition
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geoList = [
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Part.ArcOfCircle(
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Part.Circle(Vector(0, 0, 0), Vector(0, 0, 1), 47),
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0,
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math.pi
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),
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Part.ArcOfCircle(
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Part.Circle(Vector(-19, -22, 0), Vector(0, 0, 1), 89),
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math.pi / 12,
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math.pi / 1.1
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),
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Part.LineSegment(Vector(-105, 0, 0), Vector(-47, 0, 0)),
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Part.LineSegment(Vector(47, 0, 0), Vector(67, 0, 0))
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]
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arc_sketch.addGeometry(geoList, False)
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# https://wiki.freecadweb.org/Sketcher_ConstrainCoincident
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# but the best way is to add a constraint is watching
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# FreeCAD python console while create this one by the Gui
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conList = [
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Sketcher.Constraint("Coincident", 0, 3, -1, 1),
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Sketcher.Constraint("PointOnObject", 0, 2, -1),
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Sketcher.Constraint("PointOnObject", 0, 1, -1),
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Sketcher.Constraint("PointOnObject", 1, 2, -1),
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Sketcher.Constraint("PointOnObject", 1, 1, -1),
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Sketcher.Constraint("Coincident", 2, 1, 0, 2),
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Sketcher.Constraint("Coincident", 2, 2, 1, 2),
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Sketcher.Constraint("Coincident", 3, 1, 1, 1),
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Sketcher.Constraint("Coincident", 3, 2, 0, 1),
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Sketcher.Constraint("DistanceX", 2, 2, 2, 1, 58),
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Sketcher.Constraint("DistanceX", 3, 2, 3, 1, 20),
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Sketcher.Constraint("Radius", 0, 47),
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Sketcher.Constraint("Radius", 1, 89)
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]
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arc_sketch.addConstraint(conList)
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# the part extrusion
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extrude_part = doc.addObject("Part::Extrusion", "ArcExtrude")
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extrude_part.Base = arc_sketch
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extrude_part.DirMode = "Custom"
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extrude_part.Dir = Vector(0.00, 0.00, 1.00)
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extrude_part.DirLink = None
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extrude_part.LengthFwd = 30.00
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extrude_part.LengthRev = 0.00
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extrude_part.Solid = True
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extrude_part.Reversed = False
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extrude_part.Symmetric = True
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extrude_part.TaperAngle = 0.00
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extrude_part.TaperAngleRev = 0.00
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# section plane sketch
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section_sketch = doc.addObject("Sketcher::SketchObject", "Section_Sketch")
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section_sketch.Placement = FreeCAD.Placement(
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Vector(0.000000, 0.000000, 0.000000),
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Rotation(0.000000, 0.000000, 0.000000, 1.000000)
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)
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section_sketch.MapMode = "Deactivated"
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section_sketch.addGeometry(
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Part.LineSegment(Vector(-6.691961, -16.840161, 0), Vector(75.156087, 79.421394, 0)),
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False
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)
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# section_sketch.ExternalGeometry = extrude_part
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# section plane extrusion
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extrude_section_plane = doc.addObject("Part::Extrusion", "SectionPlaneExtrude")
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extrude_section_plane.Base = section_sketch
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extrude_section_plane.DirMode = "Custom"
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extrude_section_plane.Dir = Vector(0.00, 0.00, -1.00)
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extrude_section_plane.DirLink = None
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extrude_section_plane.LengthFwd = 40.00
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extrude_section_plane.LengthRev = 0.00
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extrude_section_plane.Solid = False
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extrude_section_plane.Reversed = False
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extrude_section_plane.Symmetric = True
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extrude_section_plane.TaperAngle = 0.00
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extrude_section_plane.TaperAngleRev = 0.00
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# TODO the extrusions could be done with much less code, see BOLTS
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if FreeCAD.GuiUp:
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arc_sketch.ViewObject.hide()
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section_sketch.ViewObject.hide()
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extrude_part.ViewObject.hide()
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extrude_section_plane.ViewObject.hide()
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Slice = makeSlice(name="Slice")
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Slice.Base = extrude_part
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Slice.Tools = extrude_section_plane
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Slice.Mode = "Split"
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# Slice.Proxy.execute(Slice)
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Slice.purgeTouched()
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# compound filter to get the solids of the slice
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solid_one = makeCompoundFilter(name="SolidOne")
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solid_one.Base = Slice
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solid_one.FilterType = "specific items"
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solid_one.items = "0"
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# solid_one.Proxy.execute(solid_one)
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solid_one.purgeTouched()
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if FreeCAD.GuiUp:
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solid_one.Base.ViewObject.hide()
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solid_two = makeCompoundFilter(name="SolidTwo")
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solid_two.Base = Slice
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solid_two.FilterType = "specific items"
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solid_two.items = "1"
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# solid_two.Proxy.execute(solid_two)
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solid_two.purgeTouched()
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if FreeCAD.GuiUp:
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solid_two.Base.ViewObject.hide()
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# CompSolid out of the two solids
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geom_obj = makeBooleanFragments(name="BooleanFragments")
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geom_obj.Objects = [solid_one, solid_two]
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geom_obj.Mode = "CompSolid"
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# geom_obj.Proxy.execute(geom_obj)
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geom_obj.purgeTouched()
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if FreeCAD.GuiUp:
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solid_one.ViewObject.hide()
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solid_two.ViewObject.hide()
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doc.recompute()
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if FreeCAD.GuiUp:
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geom_obj.ViewObject.Transparency = 50
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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_obj = ObjectsFem.makeSolverCalculix(doc, "SolverCalculiX")
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elif solvertype == "ccxtools":
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solver_obj = ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiXccxTools")
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solver_obj.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_obj.SplitInputWriter = False
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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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analysis.addObject(solver_obj)
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# material
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material_obj = ObjectsFem.makeMaterialSolid(doc, "Material")
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mat = material_obj.Material
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mat["Name"] = "CalculiX-Steel"
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mat["YoungsModulus"] = "210000 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 = [(geom_obj, "Face9")]
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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, "Face1")]
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con_pressure.Pressure = 100.0
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con_pressure.Reversed = False
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analysis.addObject(con_pressure)
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# constraint section print
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con_sectionpr = ObjectsFem.makeConstraintSectionPrint(doc, "ConstraintSectionPrint")
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con_sectionpr.References = [(geom_obj, "Face6")]
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analysis.addObject(con_sectionpr)
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# mesh
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from .meshes.mesh_section_print_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(ObjectsFem.makeMeshGmsh(doc, mesh_name))[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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