FEM: add constraint contact solid solid example

src/Mod/Fem/CMakeLists.txt

@@ -37,6 +37,7 @@ SET(FemExamples_SRCS
     femexamples/__init__.py
     femexamples/boxanalysis.py
     femexamples/ccx_cantilever_std.py
+    femexamples/constraint_contact_solid_solid.py
     femexamples/contact_shell_shell.py
     femexamples/manager.py
     femexamples/material_multiple_twoboxes.py
@@ -51,6 +52,7 @@ 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_box_halfcylinder_tetra10.py
     femexamples/meshes/mesh_contact_tube_tube_tria3.py
     femexamples/meshes/mesh_rc_wall_2d_tria6.py
     femexamples/meshes/mesh_platewithhole_tetra10.py

src/Mod/Fem/femexamples/constraint_contact_solid_solid.py

@@ -0,0 +1,196 @@
+# ***************************************************************************
+# *   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                                                                   *
+# *                                                                         *
+# ***************************************************************************
+
+
+# connstraint contact for solid to solid mesh
+# https://forum.freecadweb.org/viewtopic.php?f=18&t=20276
+# to run the example use:
+"""
+from femexamples.constraint_contact_solid_solid import setup
+setup()
+
+"""
+
+
+import FreeCAD
+import ObjectsFem
+import Fem
+from FreeCAD import Vector, Rotation
+
+
+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
+    # bottom box
+    bottom_box_obj = doc.addObject("Part::Box", "TopBox")
+    bottom_box_obj.Length = 100
+    bottom_box_obj.Width = 25
+    bottom_box_obj.Height = 500
+    bottom_box_obj.Placement = FreeCAD.Placement(
+        Vector(186, 0, -247),
+        Rotation(0, 0, 0),
+        Vector(0, 0, 0),
+    )
+
+    # top half cylinder
+    top_cylinder_obj = doc.addObject("Part::Cylinder", "BottomCylinder")
+    top_cylinder_obj.Radius = 30
+    top_cylinder_obj.Height = 500
+    top_cylinder_obj.Placement = FreeCAD.Placement(
+        Vector(0, -42, 0),
+        Rotation(0, 90, 0),
+        Vector(0, 0, 0),
+    )
+    top_box_obj = doc.addObject("Part::Box", "BottomBox")
+    top_box_obj.Length = 600
+    top_box_obj.Width = 100
+    top_box_obj.Height = 100
+    top_box_obj.Placement = FreeCAD.Placement(
+        Vector(-10, -142, -52),
+        Rotation(0, 0, 0),
+        Vector(0, 0, 0),
+    )
+    top_halfcyl_obj = doc.addObject("Part::Cut", "BottomHalfCylinder")
+    top_halfcyl_obj.Base = top_cylinder_obj
+    top_halfcyl_obj.Tool = top_box_obj
+    if FreeCAD.GuiUp:
+        top_cylinder_obj.ViewObject.hide()
+        top_box_obj.ViewObject.hide()
+    doc.recompute()
+
+    # all geom fusion
+    all_geom_fusion_obj = doc.addObject("Part::MultiFuse", "AllGeomFusion")
+    all_geom_fusion_obj.Shapes = [bottom_box_obj, top_halfcyl_obj]
+    if FreeCAD.GuiUp:
+        bottom_box_obj.ViewObject.hide()
+        top_halfcyl_obj.ViewObject.hide()
+
+    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.GeometricalNonlinearity = "linear"
+        solver_object.ThermoMechSteadyState = False
+        solver_object.MatrixSolverType = "default"
+        solver_object.IterationsControlParameterTimeUse = False
+        solver_object.SplitInputWriter = False
+
+        """
+        # solver parameter from fandaL, but they are not needed (see forum topic)
+        solver_object.IterationsControlParameterTimeUse = True
+        solver_object.IterationsControlParameterCutb = '0.25,0.5,0.75,0.85,,,1.5,'
+        solver_object.IterationsControlParameterIter = '4,8,9,200,10,400,,200,,'
+        solver_object.IterationsUserDefinedTimeStepLength = True
+        solver_object.TimeInitialStep = 0.1
+        solver_object.TimeEnd = 1.0
+        solver_object.IterationsUserDefinedIncrementations = True  # parameter DIRECT
+        """
+
+    # material
+    material_obj = analysis.addObject(
+        ObjectsFem.makeMaterialSolid(doc, "MechanicalMaterial")
+    )[0]
+    mat = material_obj.Material
+    mat["Name"] = "Steel-Generic"
+    mat["YoungsModulus"] = "200000 MPa"
+    mat["PoissonRatio"] = "0.30"
+    material_obj.Material = mat
+    analysis.addObject(material_obj)
+
+    # constraint fixed
+    con_fixed = analysis.addObject(
+        ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed")
+    )[0]
+    con_fixed.References = [
+        (all_geom_fusion_obj, "Face5"),
+        (all_geom_fusion_obj, "Face6"),
+        (all_geom_fusion_obj, "Face8"),
+        (all_geom_fusion_obj, "Face10"),
+    ]
+
+    # constraint pressure
+    con_pressure = analysis.addObject(
+        ObjectsFem.makeConstraintPressure(doc, name="ConstraintPressure")
+    )[0]
+    con_pressure.References = [(all_geom_fusion_obj, "Face9")]
+    con_pressure.Pressure = 100.0  # Pa ? = 100 Mpa ?
+    con_pressure.Reversed = False
+
+    # constraint contact
+    con_contact = doc.Analysis.addObject(
+        ObjectsFem.makeConstraintContact(doc, name="ConstraintContact")
+    )[0]
+    con_contact.References = [
+        (all_geom_fusion_obj, "Face7"),  # first seams slave face, TODO proof in writer code!
+        (all_geom_fusion_obj, "Face3"),  # second seams master face, TODO proof in writer code!
+    ]
+    con_contact.Friction = 0.0
+    con_contact.Slope = 1000000.0  # contact stiffness 1000000.0 kg/(mm*s^2)
+
+    # mesh
+    from .meshes.mesh_contact_box_halfcylinder_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(
+        doc.addObject("Fem::FemMeshObject", mesh_name)
+    )[0]
+    femmesh_obj.FemMesh = fem_mesh
+
+    doc.recompute()
+    return doc

src/Mod/Fem/femexamples/manager.py

@@ -34,6 +34,7 @@ doc = run_ccx_cantileverfaceload()
 doc = run_ccx_cantilevernodeload()
 doc = run_ccx_cantileverprescribeddisplacement()
 doc = run_contact_shell_shell()
+doc = run_constraint_contact_solid_solid()
 doc = run_material_nl_platewithhole()
 doc = run_material_multiple_twoboxes()
 doc = run_rcwall2d()
@@ -189,6 +190,21 @@ def run_contact_shell_shell(solver=None, base_name=None):
     return doc
 
 
+def run_constraint_contact_solid_solid(solver=None, base_name=None):
+
+    from .constraint_contact_solid_solid import setup
+    doc = setup()
+
+    if base_name is None:
+        base_name = "Constraint_Contact_Solid_Solid"
+        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