Hey, tin whiskers! I haven’t seen this happen in person since my Jerry rigged Celeron 333A killed itself. I’d created a monstrous homebrew cooler with raw bar stock aluminum as an IHS with a big fat peltier cooler and a huge heatsink so I could run the thing at 550mhz. The aluminum eventually grew a tin whisker after the machine had been running in my closet for a good 4 or so years and shorted the Celeron carrier board.
Apparently this was a pretty big problem in aerospace back in the early days, their electronics were particularly prone to this failure mode.
I’m not as tech minded as others on this platform. I think you said you were building a space ship in your closet that grew whiskers, and comitted suicide.
That seems like the kind of thing Disney would make an animated film about in the 60s. A child sized rocket thats grown depressed. So instead of flying to space with a kid inside, it instead goes into the closet for so long that it grows whiskers, and then ends it all.
It would be like that scene where bambis mom dies. It’s ONLY there to traumatize kids, and punish parents who now have to deal with a crying kid.
Tin whiskers usually don’t occur with most solders, are solders are formulated to prevent them. Perhaps this is defective solder, or there was a high thermal gradient, or repeated heat cycling has fractionated the alloy?
I didn’t take the photo, I like WMF projects (such as Wikipedia, Wikicommons, Wiktionary, Wikiquotes, Wikisource, and Wikiversity (for the Wikidebates), and I know it’s open licensed. 🙂
Stress is a measure of the force applied per unit of area of a cross section of the beam. Like how much force does a part of the beam “feel” passing through it.
Strain is a measure of relative deformation.
In the graphic above strain is visualized with the color scale, and you can see that the more a part of the beam has moved relative to its original state (unloaded, dark blue), the more the color of the part goes up the scale on the side.
It’s clearly an animated mode of a eigen value analysis. Therefore it’s “displacements” that a structure experience when subject to a vibration at it’s natural frequency. However the actual maginitude of these displacements have no meaning it is only to represent type of deformation shape one would see. If it were stress or strain you would see colors close to the base (support) of the beam.
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