FEM: examples, add shell contact

src/Mod/Fem/CMakeLists.txt

@@ -37,6 +37,7 @@ SET(FemExamples_SRCS
     femexamples/__init__.py
     femexamples/boxanalysis.py
     femexamples/ccx_cantilever_std.py
+    femexamples/contact_shell_shell.py
     femexamples/manager.py
     femexamples/material_multiple_twoboxes.py
     femexamples/material_nl_platewithhole.py
@@ -50,6 +51,7 @@ SET(FemExampleMeshes_SRCS
     femexamples/meshes/mesh_boxanalysis_tetra10.py
     femexamples/meshes/mesh_boxes_2_vertikal_tetra10.py
     femexamples/meshes/mesh_canticcx_tetra10.py
+    femexamples/meshes/mesh_contact_tube_tube_tria3.py
     femexamples/meshes/mesh_rc_wall_2d_tria6.py
     femexamples/meshes/mesh_platewithhole_tetra10.py
     femexamples/meshes/mesh_thermomech_flow1d_seg3.py

src/Mod/Fem/femexamples/contact_shell_shell.py

@@ -0,0 +1,184 @@
+# ***************************************************************************
+# *   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.                                 *
+# *                                                                         *
+# *   FreeCAD 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 FreeCAD; if not, write to the Free Software        *
+# *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  *
+# *   USA                                                                   *
+# *                                                                         *
+# ***************************************************************************
+
+
+# contact example shell to shell elements
+# https://forum.freecadweb.org/viewtopic.php?f=18&t=42228
+# based on https://forum.freecadweb.org/viewtopic.php?f=18&t=42228#p359488
+
+import FreeCAD
+import ObjectsFem
+import Fem
+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 setup(doc=None, solvertype="ccxtools"):
+    # setup model
+
+    if doc is None:
+        doc = init_doc()
+
+    # parts
+    # TODO turn circle of upper tube to have the line on the other side
+    # make a boolean fragment of them to be sure there is a mesh point on remesh
+    # but as long as we do not remesh it works without the boolean fragment too
+    # tubes
+    tube_radius = 25
+    tube_length = 500
+    sh_lower_circle = Part.Wire(Part.makeCircle(tube_radius))
+    sh_lower_tube = sh_lower_circle.extrude(FreeCAD.Vector(0, 0, tube_length))
+    lower_tube = doc.addObject("Part::Feature", "Lower_tube")
+    lower_tube.Shape = sh_lower_tube
+
+    sh_upper_circle = Part.Wire(Part.makeCircle(tube_radius))
+    sh_upper_tube = sh_upper_circle.extrude(FreeCAD.Vector(0, 0, tube_length))
+    upper_tube = doc.addObject("Part::Feature", "Upper_tube")
+    upper_tube.Shape = sh_upper_tube
+    upper_tube.Placement = FreeCAD.Placement(
+        FreeCAD.Vector(-25, 51, 475),
+        FreeCAD.Rotation(90, 0, 90),
+        FreeCAD.Vector(0, 0, 0),
+    )
+
+    # point for load
+    v_force_pt = FreeCAD.Vector(0, 76, 475)
+    sh_force_point = Part.Vertex(v_force_pt)
+    force_point = doc.addObject("Part::Feature", "Load_place_point")
+    force_point.Shape = sh_force_point
+    if FreeCAD.GuiUp:
+        force_point.ViewObject.PointSize = 10.0
+        force_point.ViewObject.PointColor = (1.0, 0.0, 0.0)
+
+    # line for load direction
+    sh_load_line = Part.makeLine(v_force_pt, FreeCAD.Vector(0, 150, 475))
+    load_line = doc.addObject("Part::Feature", "Load_direction_line")
+    load_line.Shape = sh_load_line
+    if FreeCAD.GuiUp:
+        load_line.ViewObject.LineWidth = 5.0
+        load_line.ViewObject.LineColor = (1.0, 0.0, 0.0)
+
+    doc.recompute()
+
+    if FreeCAD.GuiUp:
+        import FreeCADGui
+        FreeCADGui.ActiveDocument.activeView().viewAxonometric()
+        FreeCADGui.SendMsgToActiveView("ViewFit")
+
+    # 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""
+    if solvertype == "calculix" or solvertype == "ccxtools":
+        solver_object.AnalysisType = "static"
+        solver_object.BeamShellResultOutput3D = True
+        solver_object.GeometricalNonlinearity = "linear"  # really?
+        # TODO iterations parameter !!!
+        solver_object.ThermoMechSteadyState = False
+        solver_object.MatrixSolverType = "default"
+        solver_object.IterationsControlParameterTimeUse = False
+
+    # shell thickness
+    analysis.addObject(ObjectsFem.makeElementGeometry2D(doc, 0.5, 'ShellThickness'))
+
+    # material
+    material_obj = analysis.addObject(
+        ObjectsFem.makeMaterialSolid(doc, "MechanicalMaterial")
+    )[0]
+    mat = material_obj.Material
+    mat["Name"] = "AlCuMgPb"
+    mat["YoungsModulus"] = "72000 MPa"
+    mat["PoissonRatio"] = "0.30"
+    material_obj.Material = mat
+    analysis.addObject(material_obj)
+
+    # fixed_constraint
+    fixed_constraint = analysis.addObject(
+        ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
+    )[0]
+    fixed_constraint.References = [
+        (lower_tube, "Edge2"),
+        (upper_tube, "Edge3"),
+    ]
+
+    # force_constraint
+    force_constraint = doc.Analysis.addObject(
+        ObjectsFem.makeConstraintForce(doc, name="ConstraintForce")
+    )[0]
+    # TODO use point of tube boolean fragment
+    force_constraint.References = [(force_point, "Vertex1")]
+    force_constraint.Force = 5000.0
+    force_constraint.Direction = (load_line, ["Edge1"])
+    force_constraint.Reversed = True
+
+    # contact constraint
+    contact_constraint = doc.Analysis.addObject(
+        ObjectsFem.makeConstraintContact(doc, name="ConstraintContact")
+    )[0]
+    contact_constraint.References = [
+        (lower_tube, "Face1"),
+        (upper_tube, "Face1"),
+    ]
+    contact_constraint.Friction = 0.0
+    # contact_constrsh_aint.Slope = "1000000.0 kg/(mm*s^2)"  # contact stiffness
+    contact_constraint.Slope = 1000000.0  # should be 1000000.0 kg/(mm*s^2)
+
+    # mesh
+    from .meshes.mesh_contact_tube_tube_tria3 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(
+        doc.addObject("Fem::FemMeshObject", mesh_name)
+    )[0]
+    femmesh_obj.FemMesh = fem_mesh
+
+    doc.recompute()
+    return doc
+
+
+"""
+from femexamples import contact_shell_shell as shellcontact
+shellcontact.setup()
+
+"""

src/Mod/Fem/femexamples/manager.py

@@ -148,6 +148,21 @@ def run_ccx_cantileverprescribeddisplacement(solver=None, base_name=None):
     return doc
 
 
+def run_contact_shell_shell(solver=None, base_name=None):
+
+    from .contact_shell_shell import setup
+    doc = setup()
+
+    if base_name is None:
+        base_name = "Contact_Shell_Shell"
+        if solver is not None:
+            base_name += "_" + solver
+    run_analysis(doc, base_name)
+    doc.recompute()
+
+    return doc
+
+
 def run_material_multiple_twoboxes(solver=None, base_name=None):
 
     from .material_multiple_twoboxes import setup
@@ -246,6 +261,7 @@ doc = run_boxanalysisfrequency()
 doc = run_ccx_cantileverfaceload()
 doc = run_ccx_cantilevernodeload()
 doc = run_ccx_cantileverprescribeddisplacement()
+doc = run_contact_shell_shell()
 doc = run_material_nl_platewithhole()
 doc = run_material_multiple_twoboxes()
 doc = run_rcwall2d()