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ccxInpWriter.py
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/
ccxInpWriter.py
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import FemGui
import FreeCAD
import os
import time
class inp_writer:
def __init__(self, dir_name, mesh_obj, mat_obj, fixed_obj, force_obj):
self.mesh_object = mesh_obj
self.material_objects = mat_obj
self.fixed_objects = fixed_obj
self.force_objects = force_obj
self.base_name = dir_name + '/' + self.mesh_object.Name
self.file_name = self.base_name + '.inp'
print 'CalculiX .inp file will be written to: ', self.file_name
def write_calculix_input_file(self):
print 'write_calculix_input_file'
self.mesh_object.FemMesh.writeABAQUS(self.file_name)
# reopen file with "append" and add the analysis definition
inpfile = open(self.file_name, 'a')
inpfile.write('\n\n')
# write material element sets
inpfile.write('\n\n***********************************************************\n')
inpfile.write('** element sets for materials\n')
for material_object in self.material_objects:
print material_object['Object'].Name, ': ', material_object['Object'].Material['Name']
inpfile.write('*ELSET,ELSET=' + material_object['Object'].Name + '\n')
if len(self.material_objects) == 1:
inpfile.write('Eall\n')
else:
if material_object['Object'].Name == 'MechanicalMaterial':
inpfile.write('Eall\n')
inpfile.write('\n\n')
# write fixed node sets
inpfile.write('\n\n***********************************************************\n')
inpfile.write('** node set for fixed constraint\n')
for fixed_object in self.fixed_objects:
print fixed_object['Object'].Name
inpfile.write('*NSET,NSET=' + fixed_object['Object'].Name + '\n')
for o, f in fixed_object['Object'].References:
fo = o.Shape.getElement(f)
n = []
if fo.ShapeType == 'Face':
print ' Face Support (fixed face) on: ', f
n = self.mesh_object.FemMesh.getNodesByFace(fo)
elif fo.ShapeType == 'Edge':
print ' Line Support (fixed edge) on: ', f
n = self.mesh_object.FemMesh.getNodesByEdge(fo)
elif fo.ShapeType == 'Vertex':
print ' Point Support (fixed vertex) on: ', f
n = self.mesh_object.FemMesh.getNodesByVertex(fo)
for i in n:
inpfile.write(str(i) + ',\n')
inpfile.write('\n\n')
# write load node sets and calculate node loads
inpfile.write('\n\n***********************************************************\n')
inpfile.write('** node sets for loads\n')
for force_object in self.force_objects:
print force_object['Object'].Name
inpfile.write('*NSET,NSET=' + force_object['Object'].Name + '\n')
NbrForceNodes = 0
for o, f in force_object['Object'].References:
fo = o.Shape.getElement(f)
n = []
if fo.ShapeType == 'Face':
print ' AreaLoad (face load) on: ', f
n = self.mesh_object.FemMesh.getNodesByFace(fo)
elif fo.ShapeType == 'Edge':
print ' Line Load (edge load) on: ', f
n = self.mesh_object.FemMesh.getNodesByEdge(fo)
elif fo.ShapeType == 'Vertex':
print ' Point Load (vertex load) on: ', f
n = self.mesh_object.FemMesh.getNodesByVertex(fo)
for i in n:
inpfile.write(str(i) + ',\n')
NbrForceNodes = NbrForceNodes + 1 # NodeSum of mesh-nodes of ALL reference shapes from force_object
# calculate node load
if NbrForceNodes == 0:
print ' Warning --> no FEM-Mesh-node to apply the load to was found?'
else:
force_object['NodeLoad'] = (force_object['Object'].Force) / NbrForceNodes
inpfile.write('** concentrated load [N] distributed on all mesh nodes of the given shapes\n')
inpfile.write('** ' + str(force_object['Object'].Force) + ' N / ' + str(NbrForceNodes) + ' Nodes = ' + str(force_object['NodeLoad']) + ' N on each node\n')
if force_object['Object'].Force == 0:
print ' Warning --> Force = 0'
inpfile.write('\n\n')
# write materials
inpfile.write('\n\n***********************************************************\n')
inpfile.write('** materials\n')
inpfile.write('** youngs modulus unit is MPa = N/mm2\n')
for material_object in self.material_objects:
# get material properties
YM = FreeCAD.Units.Quantity(material_object['Object'].Material['YoungsModulus'])
if YM.Unit.Type == '':
print 'Material "YoungsModulus" has no Unit, asuming kPa!'
YM = FreeCAD.Units.Quantity(YM.Value, FreeCAD.Units.Unit('Pa'))
else:
print 'YM unit: ', YM.Unit.Type
print 'YM = ', YM
PR = float(material_object['Object'].Material['PoissonRatio'])
print 'PR = ', PR
material_name = material_object['Object'].Material['Name'][:80]
# write material properties
inpfile.write('*MATERIAL, NAME=' + material_name + '\n')
inpfile.write('*ELASTIC \n')
inpfile.write('{0:.3f}, '.format(YM.Value * 1E-3))
inpfile.write('{0:.3f}\n'.format(PR))
# write element properties
if len(self.material_objects) == 1:
inpfile.write('*SOLID SECTION, ELSET=' + material_object['Object'].Name + ', MATERIAL=' + material_name + '\n\n')
else:
if material_object['Object'].Name == 'MechanicalMaterial':
inpfile.write('*SOLID SECTION, ELSET=' + material_object['Object'].Name + ', MATERIAL=' + material_name + '\n\n')
# write step begin
inpfile.write('\n\n\n\n***********************************************************\n')
inpfile.write('** one step is needed to calculate the mechanical analysis of FreeCAD\n')
inpfile.write('** loads are applied quasi-static, means without involving the time dimension\n')
inpfile.write('*STEP\n')
inpfile.write('*STATIC\n\n')
# write constaints
inpfile.write('\n** constaints\n')
for fixed_object in self.fixed_objects:
inpfile.write('*BOUNDARY\n')
inpfile.write(fixed_object['Object'].Name + ',1\n')
inpfile.write(fixed_object['Object'].Name + ',2\n')
inpfile.write(fixed_object['Object'].Name + ',3\n\n')
# write loads
inpfile.write('\n** loads\n')
inpfile.write('** node loads, see load node sets for how the value is calculated!\n')
for force_object in self.force_objects:
if 'NodeLoad' in force_object:
vec = force_object['Object'].DirectionVector
inpfile.write('*CLOAD\n')
inpfile.write('** force: ' + str(force_object['NodeLoad']) + ' N, direction: ' + str(vec) + '\n')
v1 = "{:.15}".format(repr(vec.x * force_object['NodeLoad']))
v2 = "{:.15}".format(repr(vec.y * force_object['NodeLoad']))
v3 = "{:.15}".format(repr(vec.z * force_object['NodeLoad']))
inpfile.write(force_object['Object'].Name + ',1,' + v1 + '\n')
inpfile.write(force_object['Object'].Name + ',2,' + v2 + '\n')
inpfile.write(force_object['Object'].Name + ',3,' + v3 + '\n\n')
# write outputs, both are needed by FreeCAD
inpfile.write('\n** outputs --> frd file\n')
inpfile.write('*NODE FILE\n')
inpfile.write('U\n')
inpfile.write('*EL FILE\n')
inpfile.write('S, E\n')
inpfile.write('** outputs --> dat file\n')
inpfile.write('*NODE PRINT , NSET=Nall \n')
inpfile.write('U \n')
inpfile.write('*EL PRINT , ELSET=Eall \n')
inpfile.write('S \n')
inpfile.write('\n\n')
# write step end
inpfile.write('*END STEP \n')
# write some informations
FcVersionInfo = FreeCAD.Version()
inpfile.write('\n\n\n\n***********************************************************\n')
inpfile.write('**\n')
inpfile.write('** CalculiX Inputfile\n')
inpfile.write('**\n')
inpfile.write('** written by --> FreeCAD ' + FcVersionInfo[0] + '.' + FcVersionInfo[1] + '.' + FcVersionInfo[2] + '\n')
inpfile.write('** written on --> ' + time.ctime() + '\n')
inpfile.write('** file name --> ' + os.path.basename(FreeCAD.ActiveDocument.FileName) + '\n')
inpfile.write('** analysis name --> ' + FemGui.getActiveAnalysis().Name + '\n')
inpfile.write('**\n')
inpfile.write('**\n')
inpfile.write('** Units\n')
inpfile.write('**\n')
inpfile.write('** Geometry (mesh data) --> mm\n')
inpfile.write("** Materials (Young's modulus) --> N/mm2 = MPa\n")
inpfile.write('** Loads (nodal loads) --> N\n')
inpfile.write('**\n')
inpfile.write('**\n')
inpfile.close()
return self.base_name