# *************************************************************************** # * Copyright (c) 2021 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 * # * * # *************************************************************************** import FreeCAD from FreeCAD import Vector as vec from BasicShapes import Shapes from Draft import clone from Part import makeLine import Fem import ObjectsFem from . import manager from .manager import get_meshname from .manager import init_doc def get_information(): return { "name": "Constraint Centrif", "meshtype": "solid", "meshelement": "Tet10", "constraints": ["centrif", "fixed"], "solvers": ["calculix", "ccxtools"], "material": "multimaterial", "equations": ["mechanical"] } def get_explanation(header=""): return header + """ To run the example from Python console use: from femexamples.constraint_centrif import setup setup() See forum topic post: https://forum.freecad.org/viewtopic.php?f=18&t=57770 constraint centrif, concerning CENTRIF label from ccx's *DLOAD card """ 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()))) # geometric objects # ring stiffener = doc.addObject("Part::Box", "Stiffener") stiffener.Length = 10 stiffener.Width = 200 stiffener.Height = 10 stiffener.Placement.Base = (-5, -100, 0) circumference = Shapes.addTube(doc, "Circumference") circumference.Height = 10.0 circumference.InnerRadius = 97.5 circumference.OuterRadius = 102.5 doc.recompute() fusion = doc.addObject("Part::MultiFuse", "Fusion") fusion.Shapes = [stiffener, circumference] doc.recompute() centerhole = doc.addObject("Part::Cylinder", "CenterHole") centerhole.Radius = 3 centerhole.Height = 20 doc.recompute() ring_bottom = doc.addObject("Part::Cut", "RingBottom") ring_bottom.Base = fusion ring_bottom.Tool = centerhole doc.recompute() # standard ring ring_top = clone(ring_bottom, delta=vec(0, 0, 20)) ring_top.Label = "RingTop" # compound of both rings geom_obj = doc.addObject("Part::Compound", "TheRingOfFire") geom_obj.Links = [ring_bottom, ring_top] doc.recompute() if FreeCAD.GuiUp: geom_obj.ViewObject.Document.activeView().viewAxonometric() geom_obj.ViewObject.Document.activeView().fitAll() # line for centrif axis sh_axis_line = makeLine(vec(0, 0, 0), vec(0, 0, 31)) axis_line = doc.addObject("Part::Feature", "CentrifAxis") axis_line.Shape = sh_axis_line doc.recompute() if FreeCAD.GuiUp: axis_line.ViewObject.LineWidth = 5.0 axis_line.ViewObject.LineColor = (1.0, 0.0, 0.0) # 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) # materials material_obj_scotty = ObjectsFem.makeMaterialSolid(doc, "Steel_Scotty") mat = material_obj_scotty.Material mat["Name"] = "Steel_Scotty" mat["YoungsModulus"] = "210000 MPa" mat["PoissonRatio"] = "0.30" mat["Density"] = "4000 kg/m^3" material_obj_scotty.Material = mat material_obj_scotty.References = [(ring_bottom, "Solid1")] analysis.addObject(material_obj_scotty) material_obj_std = ObjectsFem.makeMaterialSolid(doc, "Steel_Std") mat = material_obj_std.Material mat["Name"] = "Steel_Std" mat["YoungsModulus"] = "210000 MPa" mat["PoissonRatio"] = "0.30" mat["Density"] = "8000 kg/m^3" material_obj_std.Material = mat material_obj_std.References = [(ring_top, "Solid1")] analysis.addObject(material_obj_std) # constraint fixed con_fixed = ObjectsFem.makeConstraintFixed(doc, "ConstraintFixed") con_fixed.References = [(geom_obj, ("Face4", "Face12"))] analysis.addObject(con_fixed) # constraint centrif con_centrif = ObjectsFem.makeConstraintCentrif(doc, "ConstraintCentrif") con_centrif.RotationFrequency = "100 Hz" con_centrif.RotationAxis = [(axis_line, "Edge1")] analysis.addObject(con_centrif) # mesh from .meshes.mesh_constraint_centrif_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 femmesh_obj.CharacteristicLengthMax = "5.0 mm" doc.recompute() return doc