FEM: materials: some small changes in task panel and ccx writer

src/Mod/Fem/FemInputWriterCcx.py

@@ -155,12 +155,22 @@ class FemInputWriterCcx(FemInputWriter.FemInputWriter):
         f.write('** Materials\n')
         f.write('** written by {} function\n'.format(sys._getframe().f_code.co_name))
         f.write('** Young\'s modulus unit is MPa = N/mm2\n')
+        f.write('** Density\'s unit is t/mm^3\n')
         for femobj in self.material_objects:  # femobj --> dict, FreeCAD document object is femobj['Object']
             mat_obj = femobj['Object']
-            # get material properties
+            # get material properties - Currently in SI units: M/kg/s/Kelvin
-            YM = FreeCAD.Units.Quantity(mat_obj.Material['YoungsModulus'])
+            YM_in_MPa = 1
-            YM_in_MPa = YM.getValueAs('MPa')
+            PR = 1
-            PR = float(mat_obj.Material['PoissonRatio'])
+            density_in_tonne_per_mm3 = 1
+            try:
+                YM = FreeCAD.Units.Quantity(mat_obj.Material['YoungsModulus'])
+                YM_in_MPa = YM.getValueAs('MPa')
+            except:
+                FreeCAD.Console.PrintError("No YoungsModulus defined for material: default used\n")
+            try:
+                PR = float(mat_obj.Material['PoissonRatio'])
+            except:
+                FreeCAD.Console.PrintError("No PoissonRatio defined for material: default used\n")
             mat_info_name = mat_obj.Material['Name']
             mat_name = mat_obj.Name
             # write material properties
@@ -168,10 +178,13 @@ class FemInputWriterCcx(FemInputWriter.FemInputWriter):
             f.write('*MATERIAL, NAME=' + mat_name + '\n')
             f.write('*ELASTIC \n')
             f.write('{0},  {1:.3f}\n'.format(YM_in_MPa, PR))
-            density = FreeCAD.Units.Quantity(mat_obj.Material['Density'])
+            try:
-            density_in_tone_per_mm3 = float(density.getValueAs('t/mm^3'))
+                density = FreeCAD.Units.Quantity(mat_obj.Material['Density'])
+                density_in_tonne_per_mm3 = float(density.getValueAs('t/mm^3'))
+            except:
+                FreeCAD.Console.PrintError("No Density defined for material: default used\n")
             f.write('*DENSITY \n')
-            f.write('{0:.3e}, \n'.format(density_in_tone_per_mm3))
+            f.write('{0:.3e}, \n'.format(density_in_tonne_per_mm3))
 
     def write_femelementsets(self, f):
         f.write('\n***********************************************************\n')

src/Mod/Fem/TaskPanelMechanicalMaterial.ui

@@ -93,7 +93,7 @@
       </size>
      </property>
      <property name="title">
-      <string>Properties</string>
+      <string>Material Properties</string>
      </property>
      <layout class="QVBoxLayout" name="verticalLayout_7">
       <item>
@@ -122,6 +122,9 @@
             <height>20</height>
            </size>
           </property>
+          <property name="text">
+           <string>200 GPa</string>
+          </property>
           <property name="alignment">
            <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
           </property>
@@ -176,7 +179,7 @@
            <double>0.100000000000000</double>
           </property>
           <property name="value">
-           <double>0.000000000000000</double>
+           <double>0.300000000000000</double>
           </property>
          </widget>
         </item>
@@ -202,7 +205,7 @@
            </size>
           </property>
           <property name="text">
-           <string/>
+           <string>8000 kg/m^3</string>
           </property>
           <property name="alignment">
            <set>Qt::AlignRight|Qt::AlignTrailing|Qt::AlignVCenter</set>
@@ -214,7 +217,7 @@
            <double>2000000000.000000000000000</double>
           </property>
           <property name="unit" stdset="0">
-           <string notr="true">kg/mm^3</string>
+           <string notr="true">kg/m^3</string>
           </property>
           <property name="decimals" stdset="0">
            <number>3</number>

src/Mod/Fem/_TaskPanelMechanicalMaterial.py

@@ -122,7 +122,7 @@ class _TaskPanelMechanicalMaterial:
     def ym_changed(self, value):
         import Units
         # FreeCADs standard unit for stress is kPa
-        old_ym = Units.Quantity(self.material['YoungsModulus'])
+        old_ym = Units.Quantity(self.material['YoungsModulus']).getValueAs("kPa")
         variation = 0.001
         if value:
             if not (1 - variation < float(old_ym) / value < 1 + variation):
@@ -134,15 +134,14 @@ class _TaskPanelMechanicalMaterial:
     def density_changed(self, value):
         import Units
         # FreeCADs standard unit for density is kg/mm^3
-        old_density = Units.Quantity(self.material['Density'])
+        old_density = Units.Quantity(self.material['Density']).getValueAs("kg/m^3")
         variation = 0.001
         if value:
             if not (1 - variation < float(old_density) / value < 1 + variation):
                 # density has changed
                 material = self.material
                 value_in_kg_per_m3 = value * 1e9
-                material['Density'] = unicode(value_in_kg_per_m3) + " kg/m^3"
+                material['Density'] = unicode(value_in_kg_per_m3) + " kg/m^3"  # SvdW:Keep density in SI units for easier readability
-                # material['Density'] = unicode(value) + " kg/mm^3"
                 self.material = material
 
     def pr_changed(self, value):