FEM: examples, add constraint transform torque example

src/Mod/Fem/CMakeLists.txt

@@ -59,6 +59,7 @@ SET(FemExamples_SRCS
     femexamples/constraint_selfweight_cantilever.py
     femexamples/constraint_tie.py
     femexamples/constraint_transform_beam_hinged.py
+    femexamples/constraint_transform_torque.py
     femexamples/examplesgui.py
     femexamples/elmer_nonguitutorial01_eigenvalue_of_elastic_beam.py
     femexamples/equation_electrostatics_capacitance_two_balls.py
@@ -104,6 +105,7 @@ SET(FemExampleMeshes_SRCS
     femexamples/meshes/mesh_thermomech_flow1d_seg3.py
     femexamples/meshes/mesh_thermomech_spine_tetra10.py
     femexamples/meshes/mesh_transform_beam_hinged_tetra10.py
+    femexamples/meshes/mesh_transform_torque_tetra10.py
 )
 
 SET(FemInOut_SRCS

src/Mod/Fem/femexamples/constraint_transform_torque.py

@@ -0,0 +1,172 @@
+# ***************************************************************************
+# *   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_transform_torque import setup()
+setup()
+
+"""
+
+# constraint transform with a constraint force
+# https://forum.freecadweb.org/viewtopic.php?t=19037
+# https://forum.freecadweb.org/viewtopic.php?t=18970
+
+import FreeCAD
+
+import Fem
+import ObjectsFem
+from Part import makeLine
+
+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 get_information():
+    info = {"name": "Constraint Transform Torque",
+            "meshtype": "solid",
+            "meshelement": "Tet10",
+            "constraints": ["fixed", "force", "transform"],
+            "solvers": ["calculix"],
+            "material": "solid",
+            "equation": "mechanical"
+            }
+    return info
+
+
+def setup(doc=None, solvertype="ccxtools"):
+
+    if doc is None:
+        doc = init_doc()
+
+    # line for load direction
+    sh_load_line = makeLine(FreeCAD.Vector(0, 0, 0), FreeCAD.Vector(0, 10, 0))
+    load_line = doc.addObject("Part::Feature", "Load_direction_line")
+    load_line.Shape = sh_load_line
+    doc.recompute()
+    if FreeCAD.GuiUp:
+        load_line.ViewObject.LineWidth = 5.0
+        load_line.ViewObject.LineColor = (1.0, 0.0, 0.0)
+
+    # geometry object
+    # name is important because the other method in this module use obj name
+    cylinder1 = doc.addObject("Part::Cylinder", "Cylinder1")
+    cylinder1.Height = "50 mm"
+    cylinder1.Radius = "5 mm"
+    cylinder2 = doc.addObject("Part::Cylinder", "Cylinder2")
+    cylinder2.Height = "50 mm"
+    cylinder2.Radius = "4 mm"
+    geom_obj = doc.addObject("Part::Cut", "Cut")
+    geom_obj.Base = cylinder1
+    geom_obj.Tool = cylinder2
+    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""
+    else:
+        FreeCAD.Console.PrintWarning(
+            "Not known or not supported solver type: {}. "
+            "No solver object was created.\n".format(solvertype)
+        )
+    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, "FemMaterial")
+    )[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, "Face3")]
+
+    # constraint force
+    force_constraint = doc.Analysis.addObject(
+        ObjectsFem.makeConstraintForce(doc, name="ConstraintForce")
+    )[0]
+    force_constraint.References = [(geom_obj, "Face1")]
+    force_constraint.Force = 100000.0
+    force_constraint.Direction = (load_line, ["Edge1"])
+    force_constraint.Reversed = True
+
+    # constraint transform
+    transform_constraint = doc.Analysis.addObject(
+        ObjectsFem.makeConstraintTransform(doc, name="ConstraintTransform")
+    )[0]
+    transform_constraint.References = [(geom_obj, "Face1")]
+    transform_constraint.TransformType = "Cylindrical"
+    transform_constraint.X_rot = 0.0
+    transform_constraint.Y_rot = 0.0
+    transform_constraint.Z_rot = 0.0
+
+    # mesh
+    from .meshes.mesh_transform_torque_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