xoxoxoBruce Friday Jan 20 09:00 PMJan 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 AMThat was dirty pool putting that blue sky background up there.
Snakeadelic Saturday Jan 21 08:23 AMMy 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 AMI creeped myself out anticipating that the answer was a close-up view of human skin... Sorry - gross!
footfootfoot Saturday Jan 21 03:25 PMYet 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 PMfrom a closed bridge over the Delaware?
BigV Saturday Jan 21 09:27 PMSuch 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.
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From here.
Gravdigr Sunday Jan 22 12:21 AMI dare ya to say that aga--Oh, you already did.
Undertoad Sunday Jan 22 10:43 AMEddies in the space time continuum.
"Is he." - Arthur Dent
BigV Sunday Jan 22 11:35 AMderp
Beest Monday Jan 23 10:32 AMYes, 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 AMBigV would that be the same as "Magnafluxing"?
footfootfoot Wednesday Jan 25 05:27 PM
Quote:
Originally Posted by footfootfoot
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.
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Didn't find them, I'm afraid I tossed them during a "purge" Bummer, they were cool.
Your reply here?
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