# Unit test for the FEM module #*************************************************************************** #* Copyright (c) 2015 - FreeCAD Developers * #* Author: Przemo Firszt * #* * #* 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 * #* * #***************************************************************************/ import Fem import FemTools import FreeCAD import MechanicalAnalysis import csv import tempfile import unittest mesh_name = 'Mesh' static_analysis_dir = tempfile.gettempdir() + '/FEM_static/' frequency_analysis_dir = tempfile.gettempdir() + '/FEM_frequency/' static_analysis_inp_file = FreeCAD.getHomePath() + 'Mod/Fem/static_analysis.inp' frequency_analysis_inp_file = FreeCAD.getHomePath() + 'Mod/Fem/frequency_analysis.inp' mesh_points_file = FreeCAD.getHomePath() + 'Mod/Fem/mesh_points.csv' mesh_volumes_file = FreeCAD.getHomePath() + 'Mod/Fem/mesh_volumes.csv' class FemTest(unittest.TestCase): def setUp(self): try: FreeCAD.setActiveDocument("FemTest") except: FreeCAD.newDocument("FemTest") finally: FreeCAD.setActiveDocument("FemTest") self.active_doc = FreeCAD.ActiveDocument self.box = self.active_doc.addObject("Part::Box", "Box") self.active_doc.recompute() def create_new_analysis(self): self.analysis = MechanicalAnalysis.makeMechanicalAnalysis('MechanicalAnalysis') self.active_doc.recompute() def create_new_mesh(self): self.mesh_object = self.active_doc.addObject('Fem::FemMeshObject', mesh_name) self.mesh = Fem.FemMesh() with open(mesh_points_file, 'r') as points_file: reader = csv.reader(points_file) for p in reader: self.mesh.addNode(float(p[0]), float(p[1]), float(p[2]), int(p[3])) with open(mesh_volumes_file, 'r') as volumes_file: reader = csv.reader(volumes_file) for _v in reader: v = [int(x) for x in _v] self.mesh.addVolume([v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8], v[9]]) self.mesh_object.FemMesh = self.mesh self.active_doc.recompute() def create_new_material(self): self.new_material_object = self.active_doc.addObject("App::MaterialObjectPython", 'MechanicalMaterial') mat = self.new_material_object.Material mat['Name'] = "Test Material" mat['YoungsModulus'] = "20000 MPa" mat['PoissonRatio'] = "0.36" mat['Density'] = "1000 kg/m^3" self.new_material_object.Material = mat def create_fixed_constraint(self): self.fixed_constraint = self.active_doc.addObject("Fem::ConstraintFixed", "FemConstraintFixed") self.fixed_constraint.References = [(self.box, "Face1")] def create_force_constraint(self): self.force_constraint = self.active_doc.addObject("Fem::ConstraintForce", "FemConstraintForce") self.force_constraint.References = [(self.box, "Face3")] self.force_constraint.Force = 10.000000 self.force_constraint.Direction = (self.box, ["Edge12"]) self.force_constraint.Reversed = True def create_pressure_constraint(self): self.pressure_constraint = self.active_doc.addObject("Fem::ConstraintPressure", "FemConstraintPressure") self.pressure_constraint.References = [(self.box, "Face4")] self.pressure_constraint.Pressure = 10.000000 self.pressure_constraint.Reversed = True def compare_inp_files(self, file_name1, file_name2): file1 = open(file_name1, 'r') file2 = open(file_name2, 'r') f1 = file1.readlines() f2 = file2.readlines() lf1 = [l for l in f1 if not l.startswith('**')] lf2 = [l for l in f2 if not l.startswith('**')] import difflib diff = difflib.unified_diff(lf1, lf2, n=0) result = '' for l in diff: result += l file1.close() file2.close() return result def test_new_analysis(self): FreeCAD.Console.PrintMessage('\nChecking FEM new analysis...\n') self.create_new_analysis() self.assertTrue(self.analysis, "FemTest of new analysis failed") FreeCAD.Console.PrintMessage('\nChecking FEM new mesh...\n') self.create_new_mesh() self.assertTrue(self.mesh, "FemTest of new mesh failed") self.analysis.Member = self.analysis.Member + [self.mesh_object] FreeCAD.Console.PrintMessage('\nChecking FEM new material...\n') self.create_new_material() self.assertTrue(self.new_material_object, "FemTest of new material failed") self.analysis.Member = self.analysis.Member + [self.new_material_object] FreeCAD.Console.PrintMessage('\nChecking FEM new fixed constraint...\n') self.create_fixed_constraint() self.assertTrue(self.fixed_constraint, "FemTest of new fixed constraint failed") self.analysis.Member = self.analysis.Member + [self.fixed_constraint] FreeCAD.Console.PrintMessage('\nChecking FEM new force constraint...\n') self.create_force_constraint() self.assertTrue(self.force_constraint, "FemTest of new force constraint failed") self.analysis.Member = self.analysis.Member + [self.force_constraint] FreeCAD.Console.PrintMessage('\nChecking FEM new pressure constraint...\n') self.create_pressure_constraint() self.assertTrue(self.pressure_constraint, "FemTest of new pressure constraint failed") self.analysis.Member = self.analysis.Member + [self.pressure_constraint] fea = FemTools.FemTools(self.analysis) FreeCAD.Console.PrintMessage('\nChecking FEM inp file prerequisites...\n') error = fea.check_prerequisites() self.assertFalse(error, "FemTools check_prerequisites returned error message: {}".format(error)) FreeCAD.Console.PrintMessage('\nChecking FEM inp file write...\n') fea.setup_working_dir(static_analysis_dir) FreeCAD.Console.PrintMessage('\nWriting {}/{}.inp for static analysis\n'.format(static_analysis_dir, mesh_name)) error = fea.write_inp_file() FreeCAD.Console.PrintMessage('\nComparing {} to {}/{}.inp\n'.format(static_analysis_inp_file, static_analysis_dir, mesh_name)) ret = self.compare_inp_files(static_analysis_inp_file, static_analysis_dir + "/" + mesh_name + '.inp') self.assertFalse(ret, "FemTools write_inp_file test failed.\n{}".format(ret)) fea.set_analysis_type("frequency") fea.setup_working_dir(frequency_analysis_dir) FreeCAD.Console.PrintMessage('\nWriting {}/{}.inp for frequency analysis\n'.format(frequency_analysis_dir, mesh_name)) error = fea.write_inp_file() FreeCAD.Console.PrintMessage('\nComparing {} to {}/{}.inp\n'.format(frequency_analysis_inp_file, frequency_analysis_dir, mesh_name)) ret = self.compare_inp_files(frequency_analysis_inp_file, frequency_analysis_dir + "/" + mesh_name + '.inp') self.assertFalse(ret, "FemTools write_inp_file test failed.\n{}".format(ret)) def tearDown(self): FreeCAD.closeDocument("FemTest") pass