There is a mechanical property of metals that most of the
qualities in a rod is concentrated in the narrow section
of the rim.

Wrong.


Another idiot who calls himself an engineer who has never heard of
Timoshenko's Strength of Materials.



That's mechanical and or civil engineering. Electrical engineers aren't
usually taught this stuff. The closest I came to this stuff was a
"strength of materials" 3 credit class sophomore year, and that was just
things like weights bending solid rods and such. The prof always said
"what's the first thing we do? A: Make a free body diagram"...

Maybe things are different in Europe than the USA....