That looks so simple...now I just need to find a source of titanium handy so we can do that in lab.
And I'm a little afraid of the rust remover because I read an article about hydrofluoric acid's dangers a while back.
But that really does look like something I could achieve.
I wonder what colors you can get...
Oh, thanks.
I like that the music choice for the video. The beat is a little propulsive but isn't overpowering, and the groove over top of the beat is smooth enough that it can play for nearly seven minutes without becoming repetitive or annoying.
By the by, I came upon this video because my wife and I were watching a video about the making of an apple tart in which the youtuber referred to his process as being kind of like making plywood. He's correct in that he had a rotary cutter slice off lengths of apple - as the rotary cutter slices off lengths of the tree - and then reassembles the apply lengths as the tree slides are reassembled (though he went for a round tart rather than the flat plywood.)
It's interesting to see how many people were needed for making plywood in 1954 and how few are needed in modern manufacturing.
Robots? They took our jobs, am I right?
All hail the YouTube algorithm for bringing this four-year-old video to me.
There isn't much too this demonstration. The thin aluminum top of a pop can is pressed upon back and forth a few times, and the can tab 'explodes' outward...loudly.
I assume this works because the designed failure point around the can tab is relatively weak - weaker than the rest of the solid top - and the pressing back and forth on metal stresses that point causing the failure.
Neat trick and one I think I'll give a try.
I feel bad for this youtuber having to broadcast to us from some sort of white void with bad lighting or white balance without understanding how low quality his image is compared to the quality of the images that he's sharing 'behind' him. And I don't know why he won't make eye contact with me. He keeps looking at something above and in front of me that I can't see.
Sorry for the snarkiness.
I've been watching a lot of very professionally made YouTube videos recently, and it's easy to see how much better those look than this more amateurishly produced videos, but I will admit that this guy gives a great explanation of why epoxy coated rebar is used (corrosion prevention), the problems with it (the epoxy rubs off unless the rebar is handled very gently before sealing it in concrete leading to pitting corrosion and debonding), and pros and cons of possible solutions (high costs due to scale production and lack of building code acceptance).
It's easy to think that simple solutions (just paint the rebar) won't lead to secondary problems (the paint rubbing off).
(Oh, and respect to BadLandsKid who had the top comment on this video when I accessed it most recently, "Very galvanizing topic. While it’s not set in stone, it reinforced my views on rebar.")
I warn you in advance that the actual material science content in the above video is contained very tightly between 0:33 and 2:14. The rest of the video is (at the beginning) an advertisement for a future video (the glitterbomb series is actually worth watching...begins as frivolous revenge and morphs into a serious examination of global criminal capitalism...but it's not about matsci) and (at the end) an advertisement for Rober's $249 online engineering class).
But that 0:33-2:14 shows a fun application of thermal expansion in which Rober built what he's calling an ice cream 'safe'. It's simply a metal sleeve and cap for an ice cream pint. The bottom of the sleeve is made of stainless steel, and the top is made of anodized aluminum. As Rober explains, the two fit together snugly at room temp, and the aluminum contracts 50% more at cold temperatures than does the stainless steel, locking the two parts together.
Simplicity itself, and a thing I would totally buy to demonstrate in my class...if only Rober would sell them.
I have searched the web for other, similar products thinking that somebody would have produced them, but I couldn't find one. Maybe the materials and machining precision make them cost-prohibitive.
If anybody comes across one of these for sale, could you send the info my way, please?
