# *************************************************************************** # * Copyright (c) 2020 Sudhanshu Dubey * # * Copyright (c) 2020 Bernd Hahnebach * # * * # * 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.freecad.org/viewtopic.php?t=19037 # https://forum.freecad.org/viewtopic.php?t=18970 import FreeCAD import Fem import ObjectsFem from Part import makeLine from . import manager from .manager import get_meshname from .manager import init_doc def get_information(): return { "name": "Constraint Transform Torque", "meshtype": "solid", "meshelement": "Tet10", "constraints": ["fixed", "force", "transform"], "solvers": ["calculix", "ccxtools"], "material": "solid", "equations": ["mechanical"] } def get_explanation(header=""): return header + """ To run the example from Python console use: from femexamples.constraint_transform_torque import setup setup() See forum topic post: https://forum.freecad.org/viewtopic.php?f=18&t=19037&start=10#p515447 https://forum.freecad.org/viewtopic.php?t=19037 https://forum.freecad.org/viewtopic.php?t=18970 constraint transform with a constraint force """ def setup(doc=None, solvertype="ccxtools"): 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()))) # 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_obj = ObjectsFem.makeSolverCalculix(doc, "SolverCalculiX") elif solvertype == "ccxtools": solver_obj = ObjectsFem.makeSolverCalculixCcxTools(doc, "CalculiXccxTools") solver_obj.WorkingDir = u"" else: FreeCAD.Console.PrintWarning( "Unknown or unsupported solver type: {}. " "No solver object was created.\n".format(solvertype) ) if solvertype == "calculix" or solvertype == "ccxtools": solver_obj.AnalysisType = "static" solver_obj.GeometricalNonlinearity = "linear" solver_obj.ThermoMechSteadyState = False solver_obj.MatrixSolverType = "default" solver_obj.IterationsControlParameterTimeUse = False solver_obj.SplitInputWriter = False analysis.addObject(solver_obj) # material material_obj = ObjectsFem.makeMaterialSolid(doc, "MechanicalMaterial") mat = material_obj.Material mat["Name"] = "Calculix-Steel" mat["YoungsModulus"] = "210000 MPa" mat["PoissonRatio"] = "0.30" material_obj.Material = mat analysis.addObject(material_obj) # constraint fixed con_fixed = ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed") con_fixed.References = [(geom_obj, "Face3")] analysis.addObject(con_fixed) # constraint force con_force = ObjectsFem.makeConstraintForce(doc, "ConstraintForce") con_force.References = [(geom_obj, "Face1")] con_force.Force = 2500.0 # 2500 N = 2.5 kN con_force.Direction = (load_line, ["Edge1"]) con_force.Reversed = True analysis.addObject(con_force) # constraint transform con_transform = ObjectsFem.makeConstraintTransform(doc, name="ConstraintTransform") con_transform.References = [(geom_obj, "Face1")] con_transform.TransformType = "Cylindrical" con_transform.X_rot = 0.0 con_transform.Y_rot = 0.0 con_transform.Z_rot = 0.0 analysis.addObject(con_transform) # 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, get_meshname()))[0] femmesh_obj.FemMesh = fem_mesh femmesh_obj.Part = geom_obj femmesh_obj.SecondOrderLinear = False doc.recompute() return doc