FEM: examples, add edge load calculation on twisted hollow profile

src/Mod/Fem/CMakeLists.txt

@@ -60,6 +60,7 @@ SET(FemExamples_SRCS
     femexamples/material_multiple_tensionrod_twoboxes.py
     femexamples/material_nl_platewithhole.py
     femexamples/rc_wall_2d.py
+    femexamples/square_pipe_end_twisted_edgeforces.py
     femexamples/thermomech_bimetall.py
     femexamples/thermomech_flow1d.py
     femexamples/thermomech_spine.py
@@ -76,10 +77,11 @@ SET(FemExampleMeshes_SRCS
     femexamples/meshes/mesh_contact_tube_tube_tria3.py
     femexamples/meshes/mesh_multibodybeam_tetra10.py
     femexamples/meshes/mesh_multibodybeam_tria6.py
+    femexamples/meshes/mesh_platewithhole_tetra10.py
     femexamples/meshes/mesh_rc_wall_2d_tria6.py
     femexamples/meshes/mesh_section_print_tetra10.py
     femexamples/meshes/mesh_selfweight_cantilever_tetra10.py
-    femexamples/meshes/mesh_platewithhole_tetra10.py
+    femexamples/meshes/mesh_square_pipe_end_twisted_tria6.py
     femexamples/meshes/mesh_thermomech_bimetall_tetra10.py
     femexamples/meshes/mesh_thermomech_flow1d_seg3.py
     femexamples/meshes/mesh_thermomech_spine_tetra10.py

src/Mod/Fem/femexamples/square_pipe_end_twisted_edgeforces.py

@@ -0,0 +1,180 @@
+# ***************************************************************************
+# *   Copyright (c) 2020 Sudhanshu Dubey <sudhanshu.thethunder@gmail.com>   *
+# *                                                                         *
+# *   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.square_pipe_end_twisted_edgeforces import setup
+setup()
+"""
+
+import FreeCAD
+from FreeCAD import Vector
+
+import Fem
+import ObjectsFem
+import Part
+
+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": "Square Pipe End Twisted Edgeforces",
+            "meshtype": "solid",
+            "meshelement": "Tria6",
+            "constraints": ["force", "fixed"],
+            "solvers": ["calculix"],
+            "material": "Solid",
+            "equation": "mechanical"
+            }
+    return info
+
+
+def setup(doc=None, solvertype="ccxtools"):
+
+    if doc is None:
+        doc = init_doc()
+
+    # geometry object
+    # name is important because the other method in this module use obj name
+    l1 = Part.makeLine((-142.5, -142.5, 0), (142.5, -142.5, 0))
+    l2 = Part.makeLine((142.5, -142.5, 0), (142.5, 142.5, 0))
+    l3 = Part.makeLine((142.5, 142.5, 0), (-142.5, 142.5, 0))
+    l4 = Part.makeLine((-142.5, 142.5, 0), (-142.5, -142.5, 0))
+    wire = Part.Wire([l1, l2, l3, l4])
+    shape = wire.extrude(Vector(0, 0, 1000))
+    geom_obj = doc.addObject('Part::Feature', 'SquareTube')
+    geom_obj.Shape = shape
+    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
+
+    # shell thickness
+    thickness = analysis.addObject(
+        ObjectsFem.makeElementGeometry2D(doc, 0, "ShellThickness")
+    )[0]
+    thickness.Thickness = 15.0
+
+    # material
+    material_object = analysis.addObject(
+        ObjectsFem.makeMaterialSolid(doc, "FemMaterial")
+    )[0]
+    mat = material_object.Material
+    mat["Name"] = "Steel-Generic"
+    mat["YoungsModulus"] = "200000 MPa"
+    mat["PoissonRatio"] = "0.30"
+    mat["Density"] = "7900 kg/m^3"
+    material_object.Material = mat
+
+    # fixed_constraint
+    fixed_constraint = analysis.addObject(
+        ObjectsFem.makeConstraintFixed(doc, name="ConstraintFixed"))[0]
+    fixed_constraint.References = [
+        (doc.SquareTube, "Edge4"),
+        (doc.SquareTube, "Edge7"),
+        (doc.SquareTube, "Edge10"),
+        (doc.SquareTube, "Edge12")]
+
+    # force_constraint1
+    force_constraint1 = analysis.addObject(
+        ObjectsFem.makeConstraintForce(doc, name="ConstraintForce1"))[0]
+    force_constraint1.References = [(doc.SquareTube, "Edge9")]
+    force_constraint1.Force = 100000.00
+    force_constraint1.Direction = (doc.SquareTube, ["Edge9"])
+    force_constraint1.Reversed = True
+
+    # force_constraint2
+    force_constraint2 = analysis.addObject(
+        ObjectsFem.makeConstraintForce(doc, name="ConstraintForce2"))[0]
+    force_constraint2.References = [(doc.SquareTube, "Edge3")]
+    force_constraint2.Force = 100000.00
+    force_constraint2.Direction = (doc.SquareTube, ["Edge3"])
+    force_constraint2.Reversed = True
+
+    # force_constraint3
+    force_constraint3 = analysis.addObject(
+        ObjectsFem.makeConstraintForce(doc, name="ConstraintForce3"))[0]
+    force_constraint3.References = [(doc.SquareTube, "Edge11")]
+    force_constraint3.Force = 100000.00
+    force_constraint3.Direction = (doc.SquareTube, ["Edge11"])
+    force_constraint3.Reversed = True
+
+    # force_constraint4
+    force_constraint4 = analysis.addObject(
+        ObjectsFem.makeConstraintForce(doc, name="ConstraintForce4"))[0]
+    force_constraint4.References = [(doc.SquareTube, "Edge6")]
+    force_constraint4.Force = 100000.00
+    force_constraint4.Direction = (doc.SquareTube, ["Edge6"])
+    force_constraint4.Reversed = True
+
+    # mesh
+    from .meshes.mesh_square_pipe_end_twisted_tria6 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