fixes: CompositeGeometry had str in .geoms; stress_extractor now has …

src/sectionproperties_tools/extraction.py

@@ -77,20 +77,36 @@ def extract_properties(
         return props
 
 
-def envelope_stress_results(stress_post: StressPost) -> dict[str, dict]:
+def envelope_stress_results(stress_post: StressPost, single_material: bool = False) -> dict[str, dict]:
     """
     Returns the envelope (min/max/absmax) of the stress results.
+
+    The names (keys) of the stress results are modified to match the names
+    used in sectionproperties's stress plots. e.g. "sig_zz_mxx" becomes "mxx_zz".
+
+    If 'single_material' is True and the 'stress_post' object represents stresses
+    that only occur in a single material, then the results will not be keyed by 
+    material name unnecessarily. If either is False, then the returned dict
+    will be keyed by material.
     """
-    stress_results = stress_post.get_stress()[0]
-    stress_results.pop("material")
+    stress_results = stress_post.get_stress()
     stress_envelopes = {}
-    for stress_dir_name, stress_array in stress_results.items():
-        trimmed_stress_name = stress_dir_name.replace("sig_", "")
-        stress_envelopes.setdefault(trimmed_stress_name, {})
-        max_stress = np.max(stress_array)
-        min_stress = np.min(stress_array)
-        absmax_stress = np.max(np.abs(stress_array))
-        stress_envelopes[trimmed_stress_name].update({"max": max_stress})
-        stress_envelopes[trimmed_stress_name].update({"min": min_stress})
-        stress_envelopes[trimmed_stress_name].update({"absmax": absmax_stress})
+    nest_by_material = True
+    if len(stress_results) == 1 and single_material:
+        nest_by_material = False
+    for material_stresses in stress_results:
+        material_name = material_stresses.pop("material")
+        stress_acc = stress_envelopes
+        if nest_by_material:
+            stress_envelopes.setdefault(material_name, {})
+            stress_acc = stress_envelopes[material_name]
+        for stress_dir_name, stress_array in material_stresses.items():
+            trimmed_stress_name = "_".join(stress_dir_name.replace("sig_", "").split("_")[::-1])
+            stress_acc.setdefault(trimmed_stress_name, {})
+            max_stress = np.max(stress_array)
+            min_stress = np.min(stress_array)
+            absmax_stress = np.max(np.abs(stress_array))
+            stress_acc[trimmed_stress_name].update({"max": max_stress})
+            stress_acc[trimmed_stress_name].update({"min": min_stress})
+            stress_acc[trimmed_stress_name].update({"absmax": absmax_stress})
     return stress_envelopes

src/sectionproperties_tools/serialize.py

@@ -221,6 +221,7 @@ def to_sectionproperties(self):
         init_dict = self.to_init_dict()
         if "geoms" in init_dict:
             init_dict.update({"geoms": geom})
+        # if "geom" in init_dict:
         new_inst = sec_prop_class(**init_dict)
 
         for attr_name, attr_value in self:
@@ -231,6 +232,7 @@ def to_sectionproperties(self):
                 attr_value['triangles'] = np.array(attr_value['triangles'])
                 attr_value['triangle_attributes'] = np.array(attr_value['triangle_attributes'])
             setattr(new_inst, attr_name, attr_value)
+        new_inst.geom = geom
         return new_inst