e84dd55788
Also add FEM preferences option to define working ccx directory Signed-off-by: Przemo Firszt <przemo@firszt.eu>
369 lines
18 KiB
Python
369 lines
18 KiB
Python
import FemGui
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import FreeCAD
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import os
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import time
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import sys
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class inp_writer:
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def __init__(self, analysis_obj, mesh_obj, mat_obj, fixed_obj, force_obj, pressure_obj, dir_name=None):
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self.dir_name = dir_name
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self.mesh_object = mesh_obj
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self.material_objects = mat_obj
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self.fixed_objects = fixed_obj
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self.force_objects = force_obj
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self.pressure_objects = pressure_obj
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if not dir_name:
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self.dir_name = FreeCAD.ActiveDocument.TransientDir.replace('\\', '/') + '/FemAnl_' + analysis_obj.Uid[-4:]
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if not os.path.isdir(self.dir_name):
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os.mkdir(self.dir_name)
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self.base_name = self.dir_name + '/' + self.mesh_object.Name
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self.file_name = self.base_name + '.inp'
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print 'CalculiX .inp file will be written to: ', self.file_name
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def write_calculix_input_file(self):
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print 'write_calculix_input_file'
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self.mesh_object.FemMesh.writeABAQUS(self.file_name)
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# reopen file with "append" and add the analysis definition
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inpfile = open(self.file_name, 'a')
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inpfile.write('\n\n')
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self.write_material_element_sets(inpfile)
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self.write_fixed_node_sets(inpfile)
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self.write_load_node_sets(inpfile)
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self.write_materials(inpfile)
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self.write_step_begin(inpfile)
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self.write_constraints_fixed(inpfile)
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self.write_constraints_force(inpfile)
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self.write_face_load(inpfile)
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self.write_outputs_types(inpfile)
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self.write_step_end(inpfile)
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self.write_footer(inpfile)
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inpfile.close()
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return self.base_name
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def write_material_element_sets(self, f):
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f.write('\n***********************************************************\n')
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f.write('** Element sets for materials\n')
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f.write('** written by {} function\n'.format(sys._getframe().f_code.co_name))
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for m in self.material_objects:
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mat_obj = m['Object']
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mat_obj_name = mat_obj.Name
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mat_name = mat_obj.Material['Name'][:80]
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print mat_obj_name, ': ', mat_name
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f.write('*ELSET,ELSET=' + mat_obj_name + '\n')
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if len(self.material_objects) == 1:
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f.write('Eall\n')
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else:
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if mat_obj_name == 'MechanicalMaterial':
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f.write('Eall\n')
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def write_fixed_node_sets(self, f):
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f.write('\n***********************************************************\n')
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f.write('** Node set for fixed constraint\n')
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f.write('** written by {} function\n'.format(sys._getframe().f_code.co_name))
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for fobj in self.fixed_objects:
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fix_obj = fobj['Object']
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print fix_obj.Name
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f.write('*NSET,NSET=' + fix_obj.Name + '\n')
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for o, elem in fix_obj.References:
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fo = o.Shape.getElement(elem)
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n = []
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if fo.ShapeType == 'Face':
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print ' Face Support (fixed face) on: ', elem
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n = self.mesh_object.FemMesh.getNodesByFace(fo)
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elif fo.ShapeType == 'Edge':
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print ' Line Support (fixed edge) on: ', elem
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n = self.mesh_object.FemMesh.getNodesByEdge(fo)
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elif fo.ShapeType == 'Vertex':
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print ' Point Support (fixed vertex) on: ', elem
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n = self.mesh_object.FemMesh.getNodesByVertex(fo)
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for i in n:
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f.write(str(i) + ',\n')
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def write_load_node_sets(self, f):
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f.write('\n***********************************************************\n')
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f.write('** Node sets for loads\n')
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f.write('** written by {} function\n'.format(sys._getframe().f_code.co_name))
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for fobj in self.force_objects:
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frc_obj = fobj['Object']
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print frc_obj.Name
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f.write('*NSET,NSET=' + frc_obj.Name + '\n')
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NbrForceNodes = 0
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for o, elem in frc_obj.References:
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fo = o.Shape.getElement(elem)
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n = []
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if fo.ShapeType == 'Edge':
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print ' Line Load (edge load) on: ', elem
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n = self.mesh_object.FemMesh.getNodesByEdge(fo)
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elif fo.ShapeType == 'Vertex':
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print ' Point Load (vertex load) on: ', elem
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n = self.mesh_object.FemMesh.getNodesByVertex(fo)
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for i in n:
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f.write(str(i) + ',\n')
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NbrForceNodes = NbrForceNodes + 1 # NodeSum of mesh-nodes of ALL reference shapes from force_object
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# calculate node load
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if NbrForceNodes == 0:
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print 'No Line Loads or Point Loads in the model'
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else:
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fobj['NodeLoad'] = (frc_obj.Force) / NbrForceNodes
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# FIXME this method is incorrect, but we don't have anything else right now
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# Please refer to thread "CLOAD and DLOAD for the detailed description
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# http://forum.freecadweb.org/viewtopic.php?f=18&t=10692
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f.write('** concentrated load [N] distributed on all mesh nodes of the given shapes\n')
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f.write('** ' + str(frc_obj.Force) + ' N / ' + str(NbrForceNodes) + ' Nodes = ' + str(fobj['NodeLoad']) + ' N on each node\n')
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if frc_obj.Force == 0:
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print ' Warning --> Force = 0'
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def write_materials(self, f):
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f.write('\n***********************************************************\n')
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f.write('** Materials\n')
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f.write('** written by {} function\n'.format(sys._getframe().f_code.co_name))
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f.write('** Young\'s modulus unit is MPa = N/mm2\n')
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for m in self.material_objects:
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mat_obj = m['Object']
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# get material properties
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YM = FreeCAD.Units.Quantity(mat_obj.Material['YoungsModulus'])
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YM_in_MPa = YM.getValueAs('MPa')
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PR = float(mat_obj.Material['PoissonRatio'])
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mat_obj_name = mat_obj.Name
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mat_name = mat_obj.Material['Name'][:80]
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# write material properties
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f.write('*MATERIAL, NAME=' + mat_name + '\n')
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f.write('*ELASTIC \n')
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f.write('{}, '.format(YM_in_MPa))
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f.write('{0:.3f}\n'.format(PR))
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# write element properties
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if len(self.material_objects) == 1:
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f.write('*SOLID SECTION, ELSET=' + mat_obj_name + ', MATERIAL=' + mat_name + '\n')
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else:
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if mat_obj_name == 'MechanicalMaterial':
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f.write('*SOLID SECTION, ELSET=' + mat_obj_name + ', MATERIAL=' + mat_name + '\n')
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def write_step_begin(self, f):
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f.write('\n***********************************************************\n')
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f.write('** One step is needed to calculate the mechanical analysis of FreeCAD\n')
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f.write('** loads are applied quasi-static, means without involving the time dimension\n')
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f.write('** written by {} function\n'.format(sys._getframe().f_code.co_name))
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f.write('*STEP\n')
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f.write('*STATIC\n')
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def write_constraints_fixed(self, f):
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f.write('\n***********************************************************\n')
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f.write('** Constaints\n')
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f.write('** written by {} function\n'.format(sys._getframe().f_code.co_name))
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for fixed_object in self.fixed_objects:
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fix_obj_name = fixed_object['Object'].Name
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f.write('*BOUNDARY\n')
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f.write(fix_obj_name + ',1\n')
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f.write(fix_obj_name + ',2\n')
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f.write(fix_obj_name + ',3\n\n')
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def write_constraints_force(self, f):
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def getTriangleArea(P1, P2, P3):
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vec1 = P2 - P1
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vec2 = P3 - P1
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vec3 = vec1.cross(vec2)
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return 0.5 * vec3.Length
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f.write('\n***********************************************************\n')
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f.write('** Node loads\n')
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f.write('** written by {} function\n'.format(sys._getframe().f_code.co_name))
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for fobj in self.force_objects:
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frc_obj = fobj['Object']
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if 'NodeLoad' in fobj:
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node_load = fobj['NodeLoad']
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frc_obj_name = frc_obj.Name
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vec = frc_obj.DirectionVector
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f.write('*CLOAD\n')
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f.write('** force: ' + str(node_load) + ' N, direction: ' + str(vec) + '\n')
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v1 = "{:.13E}".format(vec.x * node_load)
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v2 = "{:.13E}".format(vec.y * node_load)
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v3 = "{:.13E}".format(vec.z * node_load)
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f.write(frc_obj_name + ',1,' + v1 + '\n')
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f.write(frc_obj_name + ',2,' + v2 + '\n')
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f.write(frc_obj_name + ',3,' + v3 + '\n\n')
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# area load on faces of volume elements --> CLOAD is used
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sum_ref_face_area = 0
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sum_ref_face_node_area = 0
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sum_node_load = 0
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for o, elem in frc_obj.References:
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elem_o = o.Shape.getElement(elem)
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if elem_o.ShapeType == 'Face':
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sum_ref_face_area += elem_o.Area
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if sum_ref_face_area != 0:
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print frc_obj.Name, ', AreaLoad on faces, CLOAD is used'
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force_per_sum_ref_face_area = frc_obj.Force / sum_ref_face_area
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print ' force_per_sum_ref_face_area: ', force_per_sum_ref_face_area
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for o, elem in frc_obj.References:
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elem_o = o.Shape.getElement(elem)
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if elem_o.ShapeType == 'Face':
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ref_face = elem_o
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print ' ', o.Name, '.', elem,
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f.write('** ' + frc_obj.Name + '\n')
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f.write('*CLOAD\n')
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f.write('** node loads on element face: ' + o.Name + '.' + elem + '\n')
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volume_faces = self.mesh_object.FemMesh.getVolumesByFace(ref_face)
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face_table = {} # { meshfaceID : ( nodeID, ... , nodeID ) }
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for mv, mf in volume_faces:
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face_table[mf] = self.mesh_object.FemMesh.getElementNodes(mf)
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# calulate the appropriate node_areas for every node of every mesh face (mf)
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# G. Lakshmi Narasaiah, Finite Element Analysis, p206ff
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# [ (nodeID,Area), ... , (nodeID,Area) ] some nodes will have more than one entry
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node_area_table = []
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# { nodeID : Area, ... , nodeID:Area } AreaSum for each node, one entry for each node
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node_sumarea_table = {}
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mesh_face_area = 0
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for mf in face_table:
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# print ' ', mf, ' --> ', face_table[mf]
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if len(face_table[mf]) == 3: # 3 node mesh face triangle
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# corner_node_area = mesh_face_area / 3.0
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# P3
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# /\
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# / \
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# /____\
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# P1 P2
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P1 = self.mesh_object.FemMesh.Nodes[face_table[mf][0]]
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P2 = self.mesh_object.FemMesh.Nodes[face_table[mf][1]]
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P3 = self.mesh_object.FemMesh.Nodes[face_table[mf][2]]
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mesh_face_area = getTriangleArea(P1, P2, P3)
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corner_node_area = mesh_face_area / 3.0
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node_area_table.append((face_table[mf][0], corner_node_area))
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node_area_table.append((face_table[mf][1], corner_node_area))
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node_area_table.append((face_table[mf][2], corner_node_area))
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if len(face_table[mf]) == 6: # 6 node mesh face triangle
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# corner_node_area = 0
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# middle_node_area = mesh_face_area / 3.0
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# P3
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# /\
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# /t3\
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# / \
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# P6------P5
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# / \ t4 / \
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# /t1 \ /t2 \
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# /_____\/_____\
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# P1 P4 P2
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P1 = self.mesh_object.FemMesh.Nodes[face_table[mf][0]]
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P2 = self.mesh_object.FemMesh.Nodes[face_table[mf][1]]
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P3 = self.mesh_object.FemMesh.Nodes[face_table[mf][2]]
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P4 = self.mesh_object.FemMesh.Nodes[face_table[mf][3]]
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P5 = self.mesh_object.FemMesh.Nodes[face_table[mf][4]]
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P6 = self.mesh_object.FemMesh.Nodes[face_table[mf][5]]
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mesh_face_t1_area = getTriangleArea(P1, P4, P6)
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mesh_face_t2_area = getTriangleArea(P2, P5, P4)
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mesh_face_t3_area = getTriangleArea(P3, P6, P5)
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mesh_face_t4_area = getTriangleArea(P4, P5, P6)
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mesh_face_area = mesh_face_t1_area + mesh_face_t2_area + mesh_face_t3_area + mesh_face_t4_area
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middle_node_area = mesh_face_area / 3.0
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node_area_table.append((face_table[mf][0], 0))
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node_area_table.append((face_table[mf][1], 0))
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node_area_table.append((face_table[mf][2], 0))
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node_area_table.append((face_table[mf][3], middle_node_area))
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node_area_table.append((face_table[mf][4], middle_node_area))
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node_area_table.append((face_table[mf][5], middle_node_area))
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# node_sumarea_table
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for n, A in node_area_table:
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# print n, ' --> ', A
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if n in node_sumarea_table:
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node_sumarea_table[n] = node_sumarea_table[n] + A
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else:
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node_sumarea_table[n] = A
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sum_node_areas = 0
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for n in node_sumarea_table:
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# print n, ' --> ', node_sumarea_table[n]
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sum_node_areas = sum_node_areas + node_sumarea_table[n]
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print ' sum_node_areas ', sum_node_areas, ' ref_face.Area: ', ref_face.Area
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sum_ref_face_node_area += sum_node_areas
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# write CLOAD lines to CalculiX file
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vec = frc_obj.DirectionVector
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for n in sorted(node_sumarea_table):
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node_load = node_sumarea_table[n] * force_per_sum_ref_face_area
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sum_node_load += node_load
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#print ' nodeID: ', n, ' nodeload: ', node_load
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if (vec.x != 0.0):
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v1 = "{:.13E}".format(vec.x * node_load)
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f.write(str(n) + ',1,' + v1 + '\n')
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if (vec.y != 0.0):
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v2 = "{:.13E}".format(vec.y * node_load)
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f.write(str(n) + ',2,' + v2 + '\n')
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if (vec.z != 0.0):
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v3 = "{:.13E}".format(vec.z * node_load)
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f.write(str(n) + ',3,' + v3 + '\n')
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f.write('\n')
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# print ' sum_ref_face_node_area: ', sum_ref_face_node_area
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# print ' sum_ref_face_area : ', sum_ref_face_area
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# print ' sum_ref_face_node_area * force_per_sum_ref_face_area: ', sum_ref_face_node_area * force_per_sum_ref_face_area
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# print ' sum_node_load: ', sum_node_load
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# print ' frc_obj.Force: ', frc_obj.Force
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f.write('\n')
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def write_face_load(self, f):
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f.write('\n***********************************************************\n')
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f.write('** Element + CalculiX face + load in [MPa]\n')
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f.write('** written by {} function\n'.format(sys._getframe().f_code.co_name))
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for fobj in self.pressure_objects:
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prs_obj = fobj['Object']
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f.write('*DLOAD\n')
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for o, e in prs_obj.References:
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rev = -1 if prs_obj.Reversed else 1
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elem = o.Shape.getElement(e)
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if elem.ShapeType == 'Face':
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v = self.mesh_object.FemMesh.getccxVolumesByFace(elem)
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f.write("** Load on face {}\n".format(e))
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for i in v:
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f.write("{},P{},{}\n".format(i[0], i[1], rev * prs_obj.Pressure))
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def write_outputs_types(self, f):
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f.write('\n***********************************************************\n')
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f.write('** Outputs --> frd file\n')
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f.write('** written by {} function\n'.format(sys._getframe().f_code.co_name))
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f.write('*NODE FILE\n')
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f.write('U\n')
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f.write('*EL FILE\n')
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f.write('S, E\n')
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f.write('** outputs --> dat file\n')
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f.write('*NODE PRINT , NSET=Nall \n')
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f.write('U \n')
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f.write('*EL PRINT , ELSET=Eall \n')
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f.write('S \n')
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def write_step_end(self, f):
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f.write('\n***********************************************************\n')
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f.write('** written by {} function\n'.format(sys._getframe().f_code.co_name))
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f.write('*END STEP \n')
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def write_footer(self, f):
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FcVersionInfo = FreeCAD.Version()
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f.write('\n***********************************************************\n')
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f.write('** CalculiX Input file\n')
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f.write('** written by {} function\n'.format(sys._getframe().f_code.co_name))
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f.write('**\n')
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f.write('** written by --> FreeCAD ' + FcVersionInfo[0] + '.' + FcVersionInfo[1] + '.' + FcVersionInfo[2] + '\n')
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f.write('** written on --> ' + time.ctime() + '\n')
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f.write('** file name --> ' + os.path.basename(FreeCAD.ActiveDocument.FileName) + '\n')
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f.write('** analysis name --> ' + FemGui.getActiveAnalysis().Name + '\n')
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f.write('**\n')
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f.write('**\n')
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f.write('** Units\n')
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f.write('**\n')
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f.write('** Geometry (mesh data) --> mm\n')
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f.write("** Materials (Young's modulus) --> N/mm2 = MPa\n")
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f.write('** Loads (nodal loads) --> N\n')
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f.write('**\n')
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