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May 30th, 2017: More Pottery

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May 27th, 2017: China Moon
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   xoxoxoBruce  Friday Jan 20 09:00 PM

Jan 21st, 2017: Crack

Grand Canyon? Nope, too narrow.
Another counties canyon? Nope.
Maybe a crack on Mars? Nope.



It's a teeny tiny micro-crack in a piece of steel viewed through an electron microscope.
Beest can explain, this is his forte.



Gravdigr  Saturday Jan 21 02:41 AM

That was dirty pool putting that blue sky background up there.



Snakeadelic  Saturday Jan 21 08:23 AM

My first thought was SEM image, but I would've guessed some kind of mineral, not metal. Makes me wonder what the false-color separation is based on, since it's my understanding that SEM images come back black and white. For instance:
https://timedotcom.files.wordpress.c...lity=85&w=1100

Meet the Ebola virus in what is probably the first SEM image to identify it. Most renditions of this image are false-colored, with the virus appearing yellowish on a light-purple background.

'Scanning electron microscopy' is a keyword string that can rabbit-hole an entire afternoon!



MtnDsrt  Saturday Jan 21 10:46 AM

I creeped myself out anticipating that the answer was a close-up view of human skin... Sorry - gross!



footfootfoot  Saturday Jan 21 03:25 PM

Yet another bunch of photos I need to retrieve from the archives, a friend of mine was a metallurgist for GE and she made a bunch of electron microscope images of a broken Campagnolo crank arm at different magnifications.

I will look.



Griff  Saturday Jan 21 06:47 PM

from a closed bridge over the Delaware?



BigV  Saturday Jan 21 09:27 PM

Such cracks are a source of eddy current variations.

Quote:
Eddy current testing detects variations in electromagnetically induced currents in metals. Because it is sensitive to surface defects, eddy current testing is a preferred method for detecting cracks.Eddy current testing detects variations in electromagnetically induced currents in metals. Because it is sensitive to surface defects, eddy current testing is a preferred method for detecting cracks.
From here.


Gravdigr  Sunday Jan 22 12:21 AM

I dare ya to say that aga--Oh, you already did.



Undertoad  Sunday Jan 22 10:43 AM

Eddies in the space time continuum.

"Is he." - Arthur Dent



BigV  Sunday Jan 22 11:35 AM

derp



Beest  Monday Jan 23 10:32 AM

Yes, SEM images are intrinsically monochrome, that picture has been specifically taken at that angle and colorized for that effect. Other angles would provide better technical information.
We have a gallery of pretty pictures that cycles on a 60" TV above our SEM for visitors to gawp at.
There is one I have been meaning to colorize as it looks like a meatball.



SPUCK  Wednesday Jan 25 05:10 AM

BigV would that be the same as "Magnafluxing"?



footfootfoot  Wednesday Jan 25 05:27 PM

Quote:
Originally Posted by footfootfoot View Post
Yet another bunch of photos I need to retrieve from the archives, a friend of mine was a metallurgist for GE and she made a bunch of electron microscope images of a broken Campagnolo crank arm at different magnifications.

I will look.
Didn't find them, I'm afraid I tossed them during a "purge" Bummer, they were cool.


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