FEM: examples, add section print

src/Mod/Fem/CMakeLists.txt

@@ -50,6 +50,7 @@ SET(FemExamples_SRCS
     femexamples/ccx_cantilever_prescribeddisplacement.py
     femexamples/constraint_contact_shell_shell.py
     femexamples/constraint_contact_solid_solid.py
+    femexamples/constraint_section_print.py
     femexamples/constraint_tie.py
     femexamples/manager.py
     femexamples/material_multiple_twoboxes.py
@@ -70,6 +71,7 @@ SET(FemExampleMeshes_SRCS
     femexamples/meshes/mesh_contact_box_halfcylinder_tetra10.py
     femexamples/meshes/mesh_contact_tube_tube_tria3.py
     femexamples/meshes/mesh_rc_wall_2d_tria6.py
+    femexamples/meshes/mesh_section_print_tetra10.py
     femexamples/meshes/mesh_platewithhole_tetra10.py
     femexamples/meshes/mesh_thermomech_bimetall_tetra10.py
     femexamples/meshes/mesh_thermomech_flow1d_seg3.py

src/Mod/Fem/femexamples/constraint_section_print.py

@@ -0,0 +1,272 @@
+# ***************************************************************************
+# *   Copyright (c) 2020 Sudhanshu Dubey <sudhanshu.thethunder@gmail.com>   *
+# *   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_section_print import setup
+setup()
+
+"""
+
+# constraint section print with volume elements
+# https://forum.freecadweb.org/viewtopic.php?t=43044
+
+import math
+
+import FreeCAD
+from FreeCAD import Rotation
+from FreeCAD import Vector
+
+import Fem
+import ObjectsFem
+import Part
+import Sketcher
+from BOPTools.SplitFeatures import makeBooleanFragments
+from BOPTools.SplitFeatures import makeSlice
+from CompoundTools.CompoundFilter import makeCompoundFilter
+
+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"):
+
+    if doc is None:
+        doc = init_doc()
+
+    # geometry object
+
+    # the part sketch
+    arc_sketch = doc.addObject('Sketcher::SketchObject', 'Arc_Sketch')
+    arc_sketch.Placement = FreeCAD.Placement(
+        Vector(0, 0, 0),
+        Rotation(0, 0, 0, 1)
+    )
+    arc_sketch.MapMode = "Deactivated"
+    # not the exact geometry which makes a closed wire
+    # exact geometry will be made by the constraints
+    # the order is important for the constraints definition
+    geoList = [
+        Part.ArcOfCircle(
+            Part.Circle(Vector(0, 0, 0), Vector(0, 0, 1), 47),
+            0,
+            math.pi
+        ),
+        Part.ArcOfCircle(
+            Part.Circle(Vector(-19, -22, 0), Vector(0, 0, 1), 89),
+            math.pi / 12,
+            math.pi / 1.1
+        ),
+        Part.LineSegment(Vector(-105, 0, 0), Vector(-47, 0, 0)),
+        Part.LineSegment(Vector(47, 0, 0), Vector(67, 0, 0))
+    ]
+    arc_sketch.addGeometry(geoList, False)
+    # https://wiki.freecadweb.org/Sketcher_ConstrainCoincident
+    # but the best way is to add a constraint is watching
+    # FreeCAD python console while create this one by the Gui
+    conList = [
+        Sketcher.Constraint('Coincident', 0, 3, -1, 1),
+        Sketcher.Constraint('PointOnObject', 0, 2, -1),
+        Sketcher.Constraint('PointOnObject', 0, 1, -1),
+        Sketcher.Constraint('PointOnObject', 1, 2, -1),
+        Sketcher.Constraint('PointOnObject', 1, 1, -1),
+        Sketcher.Constraint('Coincident', 2, 1, 0, 2),
+        Sketcher.Constraint('Coincident', 2, 2, 1, 2),
+        Sketcher.Constraint('Coincident', 3, 1, 1, 1),
+        Sketcher.Constraint('Coincident', 3, 2, 0, 1),
+        Sketcher.Constraint('DistanceX', 2, 2, 2, 1, 58),
+        Sketcher.Constraint('DistanceX', 3, 2, 3, 1, 20),
+        Sketcher.Constraint('Radius', 0, 47),
+        Sketcher.Constraint('Radius', 1, 89)
+    ]
+    arc_sketch.addConstraint(conList)
+
+    # the part extrusion
+    extrude_part = doc.addObject('Part::Extrusion', 'ArcExtrude')
+    extrude_part.Base = arc_sketch
+    extrude_part.DirMode = "Custom"
+    extrude_part.Dir = Vector(0.00, 0.00, 1.00)
+    extrude_part.DirLink = None
+    extrude_part.LengthFwd = 30.00
+    extrude_part.LengthRev = 0.00
+    extrude_part.Solid = True
+    extrude_part.Reversed = False
+    extrude_part.Symmetric = True
+    extrude_part.TaperAngle = 0.00
+    extrude_part.TaperAngleRev = 0.00
+
+    # section plane sketch
+    section_sketch = doc.addObject('Sketcher::SketchObject', 'Section_Sketch')
+    section_sketch.Placement = FreeCAD.Placement(
+        Vector(0.000000, 0.000000, 0.000000),
+        Rotation(0.000000, 0.000000, 0.000000, 1.000000)
+    )
+    section_sketch.MapMode = "Deactivated"
+    section_sketch.addGeometry(
+        Part.LineSegment(Vector(-6.691961, -16.840161, 0), Vector(75.156087, 79.421394, 0)),
+        False
+    )
+    # section_sketch.ExternalGeometry = extrude_part
+
+    # section plane extrusion
+    extrude_section_plane = doc.addObject('Part::Extrusion', 'SectionPlaneExtrude')
+    extrude_section_plane.Base = section_sketch
+    extrude_section_plane.DirMode = "Custom"
+    extrude_section_plane.Dir = Vector(0.00, 0.00, -1.00)
+    extrude_section_plane.DirLink = None
+    extrude_section_plane.LengthFwd = 40.00
+    extrude_section_plane.LengthRev = 0.00
+    extrude_section_plane.Solid = False
+    extrude_section_plane.Reversed = False
+    extrude_section_plane.Symmetric = True
+    extrude_section_plane.TaperAngle = 0.00
+    extrude_section_plane.TaperAngleRev = 0.00
+
+    # TODO the extrusions could be done with much less code, see BOLTS
+
+    if FreeCAD.GuiUp:
+        arc_sketch.ViewObject.hide()
+        section_sketch.ViewObject.hide()
+        extrude_part.ViewObject.hide()
+        extrude_section_plane.ViewObject.hide()
+
+    Slice = makeSlice(name='Slice')
+    Slice.Base = extrude_part
+    Slice.Tools = extrude_section_plane
+    Slice.Mode = 'Split'
+    # Slice.Proxy.execute(Slice)
+    Slice.purgeTouched()
+
+    # compound filter to get the solids of the slice
+    solid_one = makeCompoundFilter(name='SolidOne')
+    solid_one.Base = Slice
+    solid_one.FilterType = "specific items"
+    solid_one.items = "0"
+    # solid_one.Proxy.execute(solid_one)
+    solid_one.purgeTouched()
+    solid_one.Base.ViewObject.hide()
+
+    solid_two = makeCompoundFilter(name='SolidTwo')
+    solid_two.Base = Slice
+    solid_two.FilterType = "specific items"
+    solid_two.items = "1"
+    # solid_two.Proxy.execute(solid_two)
+    solid_two.purgeTouched()
+    solid_two.Base.ViewObject.hide()
+
+    # CompSolid out of the two solids
+    geom_obj = makeBooleanFragments(name='BooleanFragments')
+    geom_obj.Objects = [solid_one, solid_two]
+    geom_obj.Mode = 'CompSolid'
+    # geom_obj.Proxy.execute(geom_obj)
+    geom_obj.purgeTouched()
+
+    if FreeCAD.GuiUp:
+        solid_one.ViewObject.hide()
+        solid_two.ViewObject.hide()
+    doc.recompute()
+
+    if FreeCAD.GuiUp:
+        geom_obj.ViewObject.Transparency = 50
+        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""
+    elif solvertype == "elmer":
+        analysis.addObject(ObjectsFem.makeSolverElmer(doc, "SolverElmer"))
+    elif solvertype == "z88":
+        analysis.addObject(ObjectsFem.makeSolverZ88(doc, "SolverZ88"))
+    if solvertype == "calculix" or solvertype == "ccxtools":
+        solver_object.SplitInputWriter = False
+        solver_object.AnalysisType = "static"
+        solver_object.GeometricalNonlinearity = "linear"
+        solver_object.ThermoMechSteadyState = False
+        solver_object.MatrixSolverType = "default"
+        solver_object.IterationsControlParameterTimeUse = False
+
+    # material
+    material_object = analysis.addObject(
+        ObjectsFem.makeMaterialSolid(doc, "Material")
+    )[0]
+    mat = material_object.Material
+    mat["Name"] = "CalculiX-Steel"
+    mat["YoungsModulus"] = "210000 MPa"
+    mat["PoissonRatio"] = "0.30"
+    material_object.Material = mat
+
+    # constraint fixed
+    fixed_constraint = analysis.addObject(
+        ObjectsFem.makeConstraintFixed(doc, name="ConstraintFixed")
+    )[0]
+    fixed_constraint.References = [(geom_obj, "Face9")]
+
+    # constraint pressure
+    pressure_constraint = analysis.addObject(
+        ObjectsFem.makeConstraintPressure(doc, name="ConstraintPressure")
+    )[0]
+    pressure_constraint.References = [(geom_obj, "Face1")]
+    pressure_constraint.Pressure = 100.0
+    pressure_constraint.Reversed = False
+
+    # constraint section print
+    section_constraint = analysis.addObject(
+        ObjectsFem.makeConstraintSectionPrint(doc, name="ConstraintSectionPrint")
+    )[0]
+    section_constraint.References = [(geom_obj, "Face6")]
+
+    # mesh
+    from .meshes.mesh_section_print_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(
+        ObjectsFem.makeMeshGmsh(doc, mesh_name)
+    )[0]
+    femmesh_obj.FemMesh = fem_mesh
+    femmesh_obj.Part = geom_obj
+    femmesh_obj.SecondOrderLinear = False
+
+    doc.recompute()
+    return doc