I don't think you could find someone working on any nanomaterial that would tell you they are working on something that could take a machined titanium aerospace part and replace it with something that weighs half as much.
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Replying to @mchapiro @LauraDeming
present day carbon fiber composites can achieve this, So I’m assuming you’re talking about the shortfalls of existing macroscopic performance of pure nano based composites, on which I don’t dispute you, I just think that breakthroughs may be possible
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Replying to @DanielleFong @LauraDeming
They certainly cannot or those titanium parts would not be flying (you might have stiffness-dominated aluminum parts not yet replaced with a chopped fiber composites). Composite *laminate* structures are ill-equipped for intricate geometries with many fastener locations.
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Replying to @mchapiro @LauraDeming
not really "an efficient market" for mechanical components yet, but you're right that chopped fiber composites aren't great. Composite laminate structures are more limited yes but more complex geometries are possible Arevo Labs is doing remarkable things. https://arevo.com/ pic.twitter.com/yow46JIE9F
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Replying to @DanielleFong @LauraDeming
Well, yes, if you include stuff that's starting to get commercialized Mantis Composites estimates 70% typical weight savings over machined metals. Alas, Arevo does not know what it's doing and is cringeworthy. I can't go too much into their poor understanding of the markets...
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But I can point out that it is not much more than a new automated fiber placement (AFP) machine, something that already existed. It's not "3D printing". 3D printing requires tight turns for that millimeter scale manipulation and AFP doesn't offer that.
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Replying to @mchapiro @LauraDeming
Seems a little limiting but ok. Worth preserving 3d printing as a technical term rather than a marketing term lest it be the new "quantum" IIRC the idea behind Arevo is this laser heating of the filatment and then pressing it into the thermoplastic / fiber matrix. Seems newish?pic.twitter.com/3v6IEX1c1G
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Replying to @DanielleFong @LauraDeming
That has existed for a while. The version with wider (often 12 inch) spools is called automated tape laying and is used to make large aircraft structures. Thousands of references in Google Scholar, including use of lasers prior to 2015. https://scholar.google.com/scholar?q=automated+fiber+placement+laser+heating&hl=en&as_sdt=0%2C33&as_vis=1&as_ylo=&as_yhi=2015 …
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Replying to @mchapiro @LauraDeming
12 inch is pretty different! this is just my view, but the details of getting everything to work together in the system matters, can usually find aspects of past work in every breakthrough design / product. at the time I looked at it had not seen comparably fine structures
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Replying to @DanielleFong @LauraDeming
Slit width tape (down to ~1/8in iirc) existed as well. That's automated fiber placement. Automated tape laying is the one with 12 inch spools. The entire range was available to them. The reason people didn't try to make the sorts of things Arevo is making is that it's not useful.
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why is it not useful? This is a very hacker news conversation
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Replying to @DanielleFong @LauraDeming
Well I have character limits and confidential info as an excuse. The bicycle is one of their highlights. Now they are releasing an electric bicycle. Drag increases non-linearly and humans are most of the weight. A carbon fiber baby stroller?
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Replying to @mchapiro @LauraDeming
there’s a large market for carbon fiber bicycles. I agree that it’s fairly silly, most sports goods are, you get so much more for technique then equipment, but you can say the same thing about the automotive industry, or phones. my friends have laid up carbon fiber bikes by hand
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