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RE: Metal fatigue

yes:
My entrance to metalury was 25yrs as a semiconductor process guy in metals / thin films. I have a book on metalurgy for Bicycles here somewhere. That is in interesting read since it introduced me to some interesting insights about alloys.

Now, back to Aluminum. I don't know offhand if Aluminum self-passivates. IOW, will the oxide 'crust' on the surfact propgate thru the entire piece or shell over and become impervious to further oxygen incursion?
Silicon, for example, as used in semiconductors has a native oxide of 20 angstroms. That's IT at room temp. Steel...at least non-core10 alloys will simply eat all the way thru.....Look at that '56 Buick which spent a couple summers vacationing in Florida, for example...or a dozen winters in Chicago with salted roads.
I don't know where Aluminum lies on this scale.
The reason I bring this up is that The wires or ribbons of the panel itself are subject to lots of stress. I'd have to think thru whether it was mainly torsion or tension.....or as the ribbon flexes, it would be compressive on the bottom and tensile on the top? Anyway, Once you get micro flex cracks, is that IT, except for the time it takes to oxidize all the way thru? IF so, as the active conductor gets less and less cross sectional area, the current density goes UP as does the tendency to 'fuse' at very high levels......

And this is WAY beyond this thread, but do you thank Magnepan has some SEMs of ribbons or wires after extensive use ot answer nutty questions like that?
NOTE TO WENDEL::
Too much is never enough


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