FEM: constraint contact: add implementation for solver CalculiX

src/Mod/Fem/FemInputWriter.py

@@ -45,6 +45,7 @@ def __init__(self,
                  analysis_obj, solver_obj,
                  mesh_obj, mat_obj,
                  fixed_obj, displacement_obj,
+                 contact_obj,
                  selfweight_obj, force_obj, pressure_obj,
                  beamsection_obj, shellthickness_obj,
                  analysis_type, eigenmode_parameters,
@@ -56,6 +57,7 @@ def __init__(self,
         self.material_objects = mat_obj
         self.fixed_objects = fixed_obj
         self.displacement_objects = displacement_obj
+        self.contact_objects = contact_obj
         self.selfweight_objects = selfweight_obj
         self.force_objects = force_obj
         self.pressure_objects = pressure_obj

src/Mod/Fem/FemInputWriterCcx.py

@@ -40,6 +40,7 @@ def __init__(self,
                  analysis_obj, solver_obj,
                  mesh_obj, mat_obj,
                  fixed_obj, displacement_obj,
+                 contact_obj,
                  selfweight_obj, force_obj, pressure_obj,
                  beamsection_obj, shellthickness_obj,
                  analysis_type=None, eigenmode_parameters=None,
@@ -49,6 +50,7 @@ def __init__(self,
                                                analysis_obj, solver_obj,
                                                mesh_obj, mat_obj,
                                                fixed_obj, displacement_obj,
+                                               contact_obj,
                                                selfweight_obj, force_obj, pressure_obj,
                                                beamsection_obj, shellthickness_obj,
                                                analysis_type, eigenmode_parameters,
@@ -69,8 +71,12 @@ def write_calculix_input_file(self):
             self.write_node_sets_constraints_fixed(inpfile)
         if self.displacement_objects:
             self.write_node_sets_constraints_displacement(inpfile)
+        if self.contact_objects:
+            self.write_surfaces_contraints_contact(inpfile)
         self.write_materials(inpfile)
         self.write_femelementsets(inpfile)
+        if self.contact_objects:
+            self.write_constraints_contact(inpfile)
         self.write_step_begin(inpfile)
         if self.fixed_objects:
             self.write_constraints_fixed(inpfile)
@@ -152,6 +158,30 @@ def write_node_sets_constraints_displacement(self, f):
             for n in femobj['Nodes']:
                 f.write(str(n) + ',\n')
 
+    def write_surfaces_contraints_contact(self, f):
+        # get surface nodes and write them to file
+        f.write('\n***********************************************************\n')
+        f.write('** Surfaces for contact constraint\n')
+        f.write('** written by {} function\n'.format(sys._getframe().f_code.co_name))
+        obj = 0
+        for femobj in self.contact_objects:  # femobj --> dict, FreeCAD document object is femobj['Object']
+            contact_obj = femobj['Object']
+            cnt = 0
+            obj = obj + 1
+            for o, elem_tup in contact_obj.References:
+                for elem in elem_tup:
+                    ref_shape = o.Shape.getElement(elem)
+                    cnt = cnt + 1
+                    if ref_shape.ShapeType == 'Face':
+                        if cnt == 1:
+                            name = "DEP" + str(obj)
+                        else:
+                            name = "IND" + str(obj)
+                        f.write('*SURFACE, NAME =' + name + '\n')
+                        v = self.mesh_object.FemMesh.getccxVolumesByFace(ref_shape)
+                        for i in v:
+                            f.write("{},S{}\n".format(i[0], i[1]))
+
     def write_materials(self, f):
         f.write('\n***********************************************************\n')
         f.write('** Materials\n')
@@ -286,6 +316,28 @@ def write_constraints_displacement(self, f):
                     f.write(disp_obj_name + ',6,6,' + str(disp_obj.zRotation) + '\n')
         f.write('\n')
 
+    def write_constraints_contact(self, f):
+        f.write('\n***********************************************************\n')
+        f.write('** Contact Constraints\n')
+        f.write('** written by {} function\n'.format(sys._getframe().f_code.co_name))
+        obj = 0
+        for femobj in self.contact_objects:  # femobj --> dict, FreeCAD document object is femobj['Object']
+            obj = obj + 1
+            contact_obj = femobj['Object']
+            f.write('*CONTACT PAIR, INTERACTION=INT' + str(obj) + ',TYPE=SURFACE TO SURFACE\n')
+            ind_surf = "IND" + str(obj)
+            dep_surf = "DEP" + str(obj)
+            f.write(dep_surf + ',' + ind_surf + '\n')
+            f.write('*SURFACE INTERACTION, NAME=INT' + str(obj) + '\n')
+            f.write('*SURFACE BEHAVIOR,PRESSURE-OVERCLOSURE=LINEAR\n')
+            slope = contact_obj.Slope
+            f.write(str(slope) + ' \n')
+            friction = contact_obj.Friction
+            if friction > 0:
+                f.write('*FRICTION \n')
+                stick = (slope / 10.0)
+                f.write(str(friction) + ', ' + str(stick) + ' \n')
+
     def write_constraints_selfweight(self, f):
         f.write('\n***********************************************************\n')
         f.write('** Self weight\n')

src/Mod/Fem/FemInputWriterZ88.py

@@ -37,6 +37,7 @@ def __init__(self,
                  analysis_obj, solver_obj,
                  mesh_obj, mat_obj,
                  fixed_obj, displacement_obj,
+                 contact_obj,
                  selfweight_obj, force_obj, pressure_obj,
                  beamsection_obj, shellthickness_obj,
                  analysis_type=None, eigenmode_parameters=None,
@@ -46,6 +47,7 @@ def __init__(self,
                                                analysis_obj, solver_obj,
                                                mesh_obj, mat_obj,
                                                fixed_obj, displacement_obj,
+                                               contact_obj,
                                                selfweight_obj, force_obj, pressure_obj,
                                                beamsection_obj, shellthickness_obj,
                                                analysis_type, eigenmode_parameters,

src/Mod/Fem/FemTools.py

@@ -153,6 +153,7 @@ def update_objects(self):
         # [{'Object':pressure_constraints, 'xxxxxxxx':value}, {}, ...]
         # [{'Object':beam_sections, 'xxxxxxxx':value}, {}, ...]
         # [{'Object':shell_thicknesses, 'xxxxxxxx':value}, {}, ...]
+        # [{'Object':contact_constraints, 'xxxxxxxx':value}, {}, ...]
 
         ## @var mesh
         #  mesh of the analysis. Used to generate .inp file and to show results
@@ -189,6 +190,10 @@ def update_objects(self):
         # set of displacements for the analysis. Updated with update_objects
         # Individual displacement_constraints are Proxy.Type "FemConstraintDisplacement"
         self.displacement_constraints = []
+        ## @var contact_constraints
+        #  set of contact constraints from the analysis. Updated with update_objects
+        #  Individual constraints are "Fem::ConstraintContact" type
+        self.contact_constraints = []
 
         found_solver_for_use = False
         for m in self.analysis.Member:
@@ -235,6 +240,10 @@ def update_objects(self):
                 displacement_constraint_dict = {}
                 displacement_constraint_dict['Object'] = m
                 self.displacement_constraints.append(displacement_constraint_dict)
+            elif m.isDerivedFrom("Fem::ConstraintContact"):
+                contact_constraint_dict = {}
+                contact_constraint_dict['Object'] = m
+                self.contact_constraints.append(contact_constraint_dict)
             elif hasattr(m, "Proxy") and m.Proxy.Type == "FemBeamSection":
                 beam_section_dict = {}
                 beam_section_dict['Object'] = m

src/Mod/Fem/FemToolsCcx.py

@@ -92,6 +92,7 @@ def write_inp_file(self):
                                               self.analysis, self.solver,
                                               self.mesh, self.materials,
                                               self.fixed_constraints, self.displacement_constraints,
+                                              self.contact_constraints,
                                               self.selfweight_constraints, self.force_constraints, self.pressure_constraints,
                                               self.beam_sections, self.shell_thicknesses,
                                               self.analysis_type, self.eigenmode_parameters,

src/Mod/Fem/FemToolsZ88.py

@@ -84,6 +84,7 @@ def write_inp_file(self):
                                               self.analysis, self.solver,
                                               self.mesh, self.materials,
                                               self.fixed_constraints, self.displacement_constraints,
+                                              self.contact_constraints,
                                               self.selfweight_constraints, self.force_constraints, self.pressure_constraints,
                                               self.beam_sections, self.shell_thicknesses,
                                               self.analysis_type, None,