FEM: examples and unit tests calculix solver, add ccx cantilever with quad8 elements

src/Mod/Fem/femexamples/ccx_cantilever_ele_quad8.py

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+# ***************************************************************************
+# *   Copyright (c) 2021 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                                                                   *
+# *                                                                         *
+# ***************************************************************************
+
+import FreeCAD
+
+import Fem
+
+from . import manager
+from .ccx_cantilever_base_face import setup_cantilever_base_face
+from .manager import get_meshname
+from .manager import init_doc
+
+
+def get_information():
+    return {
+        "name": "CCX cantilever quad8 face elements",
+        "meshtype": "face",
+        "meshelement": "Quad8",
+        "constraints": ["fixed", "force"],
+        "solvers": ["calculix"],
+        "material": "solid",
+        "equation": "mechanical"
+    }
+
+
+def get_explanation(header=""):
+    return header + """
+
+To run the example from Python console use:
+from femexamples.ccx_cantilever_ele_quad8 import setup
+setup()
+
+
+See forum topic post:
+
+
+CalculiX cantilever modeled with quad8 face elements
+
+"""
+
+
+def setup(doc=None, solvertype="ccxtools"):
+
+    # init FreeCAD document
+    if doc is None:
+        doc = init_doc()
+
+    # explanation object
+    # just keep the following line and change text string in get_explanation method
+    manager.add_explanation_obj(doc, get_explanation(manager.get_header(get_information())))
+
+    # setup CalculiX cantilever
+    doc = setup_cantilever_base_face(doc, solvertype)
+    femmesh_obj = doc.getObject(get_meshname())
+
+    # load the quad8 mesh
+    from .meshes.mesh_canticcx_quad8 import create_nodes, create_elements
+    new_fem_mesh = Fem.FemMesh()
+    control = create_nodes(new_fem_mesh)
+    if not control:
+        FreeCAD.Console.PrintError("Error on creating nodes.\n")
+    control = create_elements(new_fem_mesh)
+    if not control:
+        FreeCAD.Console.PrintError("Error on creating elements.\n")
+
+    # overwrite mesh with the quad8 mesh
+    femmesh_obj.FemMesh = new_fem_mesh
+
+    # set mesh obj parameter
+    femmesh_obj.SecondOrderLinear = False
+    femmesh_obj.ElementDimension = "2D"
+    femmesh_obj.ElementOrder = "1st"
+    femmesh_obj.CharacteristicLengthMax = "4000.0 mm"
+    femmesh_obj.CharacteristicLengthMin = "4000.0 mm"
+    femmesh_obj.RecombinationAlgorithm = "Blossom full-quad"
+    femmesh_obj.RecombineAll = True
+
+    doc.recompute()
+    return doc

src/Mod/Fem/femexamples/meshes/mesh_canticcx_quad8.py

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+def create_nodes(femmesh):
+    # nodes
+    femmesh.addNode(0.0, 500.0, 0.0, 1)
+    femmesh.addNode(0.0, 500.00000000000324, 1000.0, 2)
+    femmesh.addNode(8000.0, 500.0, 0.0, 3)
+    femmesh.addNode(8000.0, 500.00000000000324, 1000.0, 4)
+    femmesh.addNode(0.0, 500.0000000000001, 500.0, 5)
+    femmesh.addNode(0.0, 500.00000000000006, 250.0, 6)
+    femmesh.addNode(0.0, 500.00000000000017, 750.0, 7)
+    femmesh.addNode(4000.0, 500.0, 0.0, 8)
+    femmesh.addNode(2000.0, 500.0, 0.0, 9)
+    femmesh.addNode(6000.0, 500.0, 0.0, 10)
+    femmesh.addNode(8000.0, 500.0000000000001, 500.0, 11)
+    femmesh.addNode(8000.0, 500.00000000000006, 250.0, 12)
+    femmesh.addNode(8000.0, 500.00000000000017, 750.0, 13)
+    femmesh.addNode(4000.0, 500.0000000000002, 1000.0, 14)
+    femmesh.addNode(2000.0, 500.0000000000002, 1000.0, 15)
+    femmesh.addNode(6000.0, 500.0000000000002, 1000.0, 16)
+    femmesh.addNode(4000.0, 500.0000000000001, 500.0, 17)
+    femmesh.addNode(2000.0, 500.0000000000001, 500.0, 18)
+    femmesh.addNode(4000.0, 500.00000000000017, 750.0, 19)
+    femmesh.addNode(2000.0, 500.00000000000017, 750.0, 20)
+    femmesh.addNode(6000.0, 500.0000000000001, 500.0, 21)
+    femmesh.addNode(6000.0, 500.00000000000017, 750.0, 22)
+    femmesh.addNode(4000.0, 500.00000000000006, 250.0, 23)
+    femmesh.addNode(6000.0, 500.00000000000006, 250.0, 24)
+    femmesh.addNode(2000.0, 500.00000000000006, 250.0, 25)
+    return True
+
+
+def create_elements(femmesh):
+    # elements
+    femmesh.addFace([1, 5, 17, 8, 6, 18, 23, 9], 1)
+    femmesh.addFace([5, 2, 14, 17, 7, 15, 19, 18], 2)
+    femmesh.addFace([17, 14, 4, 11, 19, 16, 13, 21], 3)
+    femmesh.addFace([8, 17, 11, 3, 23, 21, 12, 10], 4)
+    return True