Jan 21st, 2017: Crack

xoxoxoBruce · 01-20-2017, 08:00 PM

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 · 01-21-2017, 01:41 AM

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

Snakeadelic · 01-21-2017, 07:23 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 · 01-21-2017, 09:46 AM

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

footfootfoot · 01-21-2017, 02:25 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 · 01-21-2017, 05:47 PM

from a closed bridge over the Delaware?

BigV · 01-21-2017, 08:27 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 · 01-21-2017, 11:21 PM

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

Undertoad · 01-22-2017, 09:43 AM

Eddies in the space time continuum.

"Is he." - Arthur Dent

BigV · 01-22-2017, 10:35 AM

derp

Beest · 01-23-2017, 09:32 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 · 01-25-2017, 04:10 AM

BigV would that be the same as "Magnafluxing"?

footfootfoot · 01-25-2017, 04:27 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.

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

01-20-2017, 08:00 PM	#1
xoxoxoBruce The future is unwritten Join Date: Oct 2002 Posts: 71,105	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. __________________ The descent of man ~ Nixon, Friedman, Reagan, Trump.

01-21-2017, 01:41 AM	#2
Gravdigr The Un-Tuckian Join Date: Apr 2007 Location: South Central...KY that is Posts: 39,517	That was dirty pool putting that blue sky background up there. __________________ These statements have not been evaluated by the FDA, EPA, FBI, DEA, CDC, or FDIC. These statements are not intended to diagnose, cause, treat, cure, or prevent any disease. If you feel you have been harmed/offended by, or, disagree with any of the above statements or images, please feel free to fuck right off.

01-21-2017, 02:25 PM	#5
footfootfoot To shreds, you say? Join Date: Aug 2004 Location: in the house and on the street-how many, many feet we meet! Posts: 18,449	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. __________________ The internet is a hateful stew of vomit you can never take completely seriously. - Her Fobs

01-21-2017, 05:47 PM	#6
Griff still says videotape Join Date: Feb 2001 Posts: 26,813	from a closed bridge over the Delaware? __________________ If you would only recognize that life is hard, things would be so much easier for you. - Louis D. Brandeis

01-21-2017, 11:21 PM	#8
Gravdigr The Un-Tuckian Join Date: Apr 2007 Location: South Central...KY that is Posts: 39,517	I dare ya to say that aga--Oh, you already did. __________________ These statements have not been evaluated by the FDA, EPA, FBI, DEA, CDC, or FDIC. These statements are not intended to diagnose, cause, treat, cure, or prevent any disease. If you feel you have been harmed/offended by, or, disagree with any of the above statements or images, please feel free to fuck right off.

01-21-2017, 07:23 AM	#3
Snakeadelic Banned Join Date: May 2015 Posts: 660	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!

01-21-2017, 09:46 AM	#4
MtnDsrt Lead Subordinate Join Date: Dec 2016 Posts: 15	I creeped myself out anticipating that the answer was a close-up view of human skin... Sorry - gross!

01-22-2017, 09:43 AM	#9
Undertoad Radical Centrist Join Date: Jan 2001 Location: Cottage of Prussia Posts: 31,423	Eddies in the space time continuum. "Is he." - Arthur Dent

01-22-2017, 10:35 AM	#10
BigV Goon Squad Leader Join Date: Nov 2004 Location: Seattle Posts: 27,063	derp __________________ Be Just and Fear Not.

01-23-2017, 09:32 AM	#11
Beest Adapt and Survive Join Date: Jan 2007 Location: Ann Arbor, Mi Posts: 957	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.

01-25-2017, 04:10 AM	#12
SPUCK Professor Join Date: Oct 2006 Posts: 1,911	BigV would that be the same as "Magnafluxing"?

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