# *************************************************************************** # * 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 BOPTools import SplitFeatures 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": "Truss 3D circle cs, seg3 elements", "meshtype": "edge", "meshelement": "Seg3", "constraints": ["fixed", "force"], "solvers": ["calculix", "ccxtools"], "material": "solid", "equations": ["mechanical"] } def get_explanation(header=""): return header + """ # To run the example from Python console use, # (works even after an edit without restart of FreeCAD): import importlib import femexamples.truss_3d_cs_circle_ele_seg3 as example importlib.reload(example) example.setup() See forum topic post: https://forum.freecad.org/viewtopic.php?f=18&t=23318&start=20#p521050 https://forum.freecad.org/viewtopic.php?f=13&t=59239&start=100#p521220 Z88 official example 2, crane beam - nonsway (on x deformation on both support) - in practical engineering one would let the truss breathe on one side - max deflection CalxuliX: 8.22 mm # but it needs four seg3 elements foreach bar - max deflection Mystran : x.xx mm - max deflection Z88 : 8.19 mm # one seg2 truss element foreach bar """ 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 object # load line load_line = doc.addObject("Part::Line", "LoadLine") load_line.X1 = 0 load_line.Y1 = 0 load_line.Z1 = 1000 load_line.X2 = 0 load_line.Y2 = 0 load_line.Z2 = 0 if FreeCAD.GuiUp: load_line.ViewObject.hide() # commands were generated by Python out of the original Z88 Mesh obj data v1 = vec(0.0, 2000.0, 0.0) v2 = vec(0.0, 0.0, 0.0) v3 = vec(1000.0, 1000.0, 2000.0) v4 = vec(2000.0, 2000.0, 0.0) v5 = vec(2000.0, 0.0, 0.0) v6 = vec(3000.0, 1000.0, 2000.0) v7 = vec(4000.0, 2000.0, 0.0) v8 = vec(4000.0, 0.0, 0.0) v9 = vec(5000.0, 1000.0, 2000.0) v10 = vec(6000.0, 2000.0, 0.0) v11 = vec(6000.0, 0.0, 0.0) v12 = vec(7000.0, 1000.0, 2000.0) v13 = vec(8000.0, 2000.0, 0.0) v14 = vec(8000.0, 0.0, 0.0) v15 = vec(9000.0, 1000.0, 2000.0) v16 = vec(10000.0, 2000.0, 0.0) v17 = vec(10000.0, 0.0, 0.0) v18 = vec(11000.0, 1000.0, 2000.0) v19 = vec(12000.0, 2000.0, 0.0) v20 = vec(12000.0, 0.0, 0.0) line1 = makeLine(v1, v2) line2 = makeLine(v4, v5) line3 = makeLine(v7, v8) line4 = makeLine(v10, v11) line5 = makeLine(v13, v14) line6 = makeLine(v16, v17) line7 = makeLine(v19, v20) line8 = makeLine(v1, v4) line9 = makeLine(v2, v5) line10 = makeLine(v4, v7) line11 = makeLine(v5, v8) line12 = makeLine(v7, v10) line13 = makeLine(v8, v11) line14 = makeLine(v10, v13) line15 = makeLine(v11, v14) line16 = makeLine(v13, v16) line17 = makeLine(v14, v17) line18 = makeLine(v16, v19) line19 = makeLine(v17, v20) line20 = makeLine(v1, v3) line21 = makeLine(v4, v6) line22 = makeLine(v7, v9) line23 = makeLine(v10, v12) line24 = makeLine(v13, v15) line25 = makeLine(v16, v18) line26 = makeLine(v2, v3) line27 = makeLine(v5, v6) line28 = makeLine(v8, v9) line29 = makeLine(v11, v12) line30 = makeLine(v14, v15) line31 = makeLine(v17, v18) line32 = makeLine(v3, v4) line33 = makeLine(v6, v7) line34 = makeLine(v9, v10) line35 = makeLine(v12, v13) line36 = makeLine(v15, v16) line37 = makeLine(v18, v19) line38 = makeLine(v3, v5) line39 = makeLine(v6, v8) line40 = makeLine(v9, v11) line41 = makeLine(v12, v14) line42 = makeLine(v15, v17) line43 = makeLine(v18, v20) line44 = makeLine(v3, v6) line45 = makeLine(v6, v9) line46 = makeLine(v9, v12) line47 = makeLine(v12, v15) line48 = makeLine(v15, v18) line49 = makeLine(v2, v4) line50 = makeLine(v5, v7) line51 = makeLine(v8, v10) line52 = makeLine(v11, v13) line53 = makeLine(v14, v16) line54 = makeLine(v17, v19) obj_line1 = doc.addObject("Part::Feature", "Line1") obj_line1.Shape = line1 obj_line2 = doc.addObject("Part::Feature", "Line2") obj_line2.Shape = line2 obj_line3 = doc.addObject("Part::Feature", "Line3") obj_line3.Shape = line3 obj_line4 = doc.addObject("Part::Feature", "Line4") obj_line4.Shape = line4 obj_line5 = doc.addObject("Part::Feature", "Line5") obj_line5.Shape = line5 obj_line6 = doc.addObject("Part::Feature", "Line6") obj_line6.Shape = line6 obj_line7 = doc.addObject("Part::Feature", "Line7") obj_line7.Shape = line7 obj_line8 = doc.addObject("Part::Feature", "Line8") obj_line8.Shape = line8 obj_line9 = doc.addObject("Part::Feature", "Line9") obj_line9.Shape = line9 obj_line10 = doc.addObject("Part::Feature", "Line10") obj_line10.Shape = line10 obj_line11 = doc.addObject("Part::Feature", "Line11") obj_line11.Shape = line11 obj_line12 = doc.addObject("Part::Feature", "Line12") obj_line12.Shape = line12 obj_line13 = doc.addObject("Part::Feature", "Line13") obj_line13.Shape = line13 obj_line14 = doc.addObject("Part::Feature", "Line14") obj_line14.Shape = line14 obj_line15 = doc.addObject("Part::Feature", "Line15") obj_line15.Shape = line15 obj_line16 = doc.addObject("Part::Feature", "Line16") obj_line16.Shape = line16 obj_line17 = doc.addObject("Part::Feature", "Line17") obj_line17.Shape = line17 obj_line18 = doc.addObject("Part::Feature", "Line18") obj_line18.Shape = line18 obj_line19 = doc.addObject("Part::Feature", "Line19") obj_line19.Shape = line19 obj_line20 = doc.addObject("Part::Feature", "Line20") obj_line20.Shape = line20 obj_line21 = doc.addObject("Part::Feature", "Line21") obj_line21.Shape = line21 obj_line22 = doc.addObject("Part::Feature", "Line22") obj_line22.Shape = line22 obj_line23 = doc.addObject("Part::Feature", "Line23") obj_line23.Shape = line23 obj_line24 = doc.addObject("Part::Feature", "Line24") obj_line24.Shape = line24 obj_line25 = doc.addObject("Part::Feature", "Line25") obj_line25.Shape = line25 obj_line26 = doc.addObject("Part::Feature", "Line26") obj_line26.Shape = line26 obj_line27 = doc.addObject("Part::Feature", "Line27") obj_line27.Shape = line27 obj_line28 = doc.addObject("Part::Feature", "Line28") obj_line28.Shape = line28 obj_line29 = doc.addObject("Part::Feature", "Line29") obj_line29.Shape = line29 obj_line30 = doc.addObject("Part::Feature", "Line30") obj_line30.Shape = line30 obj_line31 = doc.addObject("Part::Feature", "Line31") obj_line31.Shape = line31 obj_line32 = doc.addObject("Part::Feature", "Line32") obj_line32.Shape = line32 obj_line33 = doc.addObject("Part::Feature", "Line33") obj_line33.Shape = line33 obj_line34 = doc.addObject("Part::Feature", "Line34") obj_line34.Shape = line34 obj_line35 = doc.addObject("Part::Feature", "Line35") obj_line35.Shape = line35 obj_line36 = doc.addObject("Part::Feature", "Line36") obj_line36.Shape = line36 obj_line37 = doc.addObject("Part::Feature", "Line37") obj_line37.Shape = line37 obj_line38 = doc.addObject("Part::Feature", "Line38") obj_line38.Shape = line38 obj_line39 = doc.addObject("Part::Feature", "Line39") obj_line39.Shape = line39 obj_line40 = doc.addObject("Part::Feature", "Line40") obj_line40.Shape = line40 obj_line41 = doc.addObject("Part::Feature", "Line41") obj_line41.Shape = line41 obj_line42 = doc.addObject("Part::Feature", "Line42") obj_line42.Shape = line42 obj_line43 = doc.addObject("Part::Feature", "Line43") obj_line43.Shape = line43 obj_line44 = doc.addObject("Part::Feature", "Line44") obj_line44.Shape = line44 obj_line45 = doc.addObject("Part::Feature", "Line45") obj_line45.Shape = line45 obj_line46 = doc.addObject("Part::Feature", "Line46") obj_line46.Shape = line46 obj_line47 = doc.addObject("Part::Feature", "Line47") obj_line47.Shape = line47 obj_line48 = doc.addObject("Part::Feature", "Line48") obj_line48.Shape = line48 obj_line49 = doc.addObject("Part::Feature", "Line49") obj_line49.Shape = line49 obj_line50 = doc.addObject("Part::Feature", "Line50") obj_line50.Shape = line50 obj_line51 = doc.addObject("Part::Feature", "Line51") obj_line51.Shape = line51 obj_line52 = doc.addObject("Part::Feature", "Line52") obj_line52.Shape = line52 obj_line53 = doc.addObject("Part::Feature", "Line53") obj_line53.Shape = line53 obj_line54 = doc.addObject("Part::Feature", "Line54") obj_line54.Shape = line54 doc.recompute() geom_obj = SplitFeatures.makeBooleanFragments(name="CraneTruss") geom_obj.Objects = [ obj_line1, obj_line2, obj_line3, obj_line4, obj_line5, obj_line6, obj_line7, obj_line8, obj_line9, obj_line10, obj_line11, obj_line12, obj_line13, obj_line14, obj_line15, obj_line16, obj_line17, obj_line18, obj_line19, obj_line20, obj_line21, obj_line22, obj_line23, obj_line24, obj_line25, obj_line26, obj_line27, obj_line28, obj_line29, obj_line30, obj_line31, obj_line32, obj_line33, obj_line34, obj_line35, obj_line36, obj_line37, obj_line38, obj_line39, obj_line40, obj_line41, obj_line42, obj_line43, obj_line44, obj_line45, obj_line46, obj_line47, obj_line48, obj_line49, obj_line50, obj_line51, obj_line52, obj_line53, obj_line54, ] if FreeCAD.GuiUp: obj_line1.ViewObject.hide() obj_line2.ViewObject.hide() obj_line3.ViewObject.hide() obj_line4.ViewObject.hide() obj_line5.ViewObject.hide() obj_line6.ViewObject.hide() obj_line7.ViewObject.hide() obj_line8.ViewObject.hide() obj_line9.ViewObject.hide() obj_line10.ViewObject.hide() obj_line11.ViewObject.hide() obj_line12.ViewObject.hide() obj_line13.ViewObject.hide() obj_line14.ViewObject.hide() obj_line15.ViewObject.hide() obj_line16.ViewObject.hide() obj_line17.ViewObject.hide() obj_line18.ViewObject.hide() obj_line19.ViewObject.hide() obj_line20.ViewObject.hide() obj_line21.ViewObject.hide() obj_line22.ViewObject.hide() obj_line23.ViewObject.hide() obj_line24.ViewObject.hide() obj_line25.ViewObject.hide() obj_line26.ViewObject.hide() obj_line27.ViewObject.hide() obj_line28.ViewObject.hide() obj_line29.ViewObject.hide() obj_line30.ViewObject.hide() obj_line31.ViewObject.hide() obj_line32.ViewObject.hide() obj_line33.ViewObject.hide() obj_line34.ViewObject.hide() obj_line35.ViewObject.hide() obj_line36.ViewObject.hide() obj_line37.ViewObject.hide() obj_line38.ViewObject.hide() obj_line39.ViewObject.hide() obj_line40.ViewObject.hide() obj_line41.ViewObject.hide() obj_line42.ViewObject.hide() obj_line43.ViewObject.hide() obj_line44.ViewObject.hide() obj_line45.ViewObject.hide() obj_line46.ViewObject.hide() obj_line47.ViewObject.hide() obj_line48.ViewObject.hide() obj_line49.ViewObject.hide() obj_line50.ViewObject.hide() obj_line51.ViewObject.hide() obj_line52.ViewObject.hide() obj_line53.ViewObject.hide() obj_line54.ViewObject.hide() 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"" elif solvertype == "z88": solver_obj = ObjectsFem.makeSolverZ88(doc, "SolverZ88") 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.SplitInputWriter = False solver_obj.AnalysisType = "static" solver_obj.GeometricalNonlinearity = "linear" solver_obj.ThermoMechSteadyState = False solver_obj.MatrixSolverType = "default" solver_obj.IterationsControlParameterTimeUse = False analysis.addObject(solver_obj) # beam section beamsection_obj = ObjectsFem.makeElementGeometry1D( doc, sectiontype="Circular", height=25.0, name="CrossSectionCircular" ) analysis.addObject(beamsection_obj) # material material_obj = ObjectsFem.makeMaterialSolid(doc, "MechanicalMaterial") mat = material_obj.Material mat["Name"] = "Steel" mat["YoungsModulus"] = "200000 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, ("Vertex1", "Vertex2", "Vertex13", "Vertex14"))] analysis.addObject(con_fixed) # constraint force con_force = ObjectsFem.makeConstraintForce(doc, "ConstraintForce") con_force.References = [(geom_obj, ("Vertex5", "Vertex6"))] con_force.Force = 60000.0 # 30 kN on each Node con_force.Direction = (load_line, ["Edge1"]) con_force.Reversed = False analysis.addObject(con_force) # mesh from .meshes.mesh_truss_crane_seg3 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.ElementDimension = "1D" # four elements for each bar femmesh_obj.CharacteristicLengthMax = "1500.0 mm" femmesh_obj.CharacteristicLengthMin = "1500.0 mm" if FreeCAD.GuiUp: femmesh_obj.ViewObject.DisplayMode = "Faces, Wireframe & Nodes" femmesh_obj.ViewObject.PointColor = (1.0, 0.0, 0.5, 0.0) doc.recompute() return doc