Comment on Aluminum

moshankey@lemmy.world ⁨1⁩ ⁨year⁩ ago

• Damage@feddit.it ⁨1⁩ ⁨year⁩ ago

  not to defend Alluminium (bleh), but that’s likely a production error, bad hydroforming, bad welds… at least it’s not CF!

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  • moshankey@lemmy.world ⁨1⁩ ⁨year⁩ ago

    It was the early 90’s and Raleigh had a line called Technium. The tubes were bonded to the lugs. Not really welded. More pinned and “glued” I guess. The frame broke at either the top or down tube and there went the fork, and my buddy’s face. Screw aluminum. Steel has memory. I found that out the hard way. I’m far from a metallurgist. This is the extent of my elementary teacher brain.

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• Eheran@lemmy.world ⁨1⁩ ⁨year⁩ ago

  having no fatigue limit is a bitch.

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  • mnemonicmonkeys@sh.itjust.works ⁨1⁩ ⁨year⁩ ago

    While I agree, I do have to clarify rhat there is a fatigue limit, it’s mainly that the limit for steel increases so fast that few people are willing to put in the testing for billions of cycles to model ultra-high cycle fatigue

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    • Eheran@lemmy.world ⁨1⁩ ⁨year⁩ ago

      Where is that limit supposed to be? The line does not flatten, unlike that of steel. Which is a flat line from 1 million to 1 billion cycles. During the same number of cycles, aluminium drops from 25 to 14 ski, a loss of 44 %.

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      • mnemonicmonkeys@sh.itjust.works ⁨1⁩ ⁨year⁩ ago

        First off, referring to it as a “limit” is incorrect. In engineering you have what’s called an S-N diagram, which plots out the average time to failure based on average cyclic stress. Basically, a lower avaerage stress results in a higher average life. Also, this plot uses a logarithmic scale for both axis, because then all of the plots are straight lines.

        For steel, the S-N diagram has what’s called the “knee”, which is where you have two distinct lines in the S-N curve: one horizontal and one at an angle, with the two intersecting at 1 million cycles. Referring to the knee as a limit (like in the article) is wrong because it’s not a limit; it’s the threshold where if you design a part to last beyond that (aka less cyclic stress than would get 1 million cycles) then it practically lasts forever.

        In reality, the part won’t actually last forever, since the S-N curve beyond 1 million cycles isn’t perfectly horizontal. It’s just that reducing your cyclic stress quickly increases your predicted life into billions or even trillions of cycles. This is known as ultra-high cycle fatigue, and it’s generally impractical to do all the testing required to model because each sample would take months to test on the low end. Plus, there’s little demand for such models in the industry, though there are a handful of PhD students and post-docs working on it

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• Maalus@lemmy.world ⁨1⁩ ⁨year⁩ ago

  Aluminium doesn’t get stronger on the welds like steel does, it gets weaker. So if you screw them up, you end up with a two part bike

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  • MightyCuriosity@sh.itjust.works ⁨1⁩ ⁨year⁩ ago

    Weaker or more brittle?

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    • Maalus@lemmy.world ⁨1⁩ ⁨year⁩ ago

      Weaker, by like 50%. Welding aluminium isn’t worth it most of the time, just use steel if you need that. Otherwise bolt it together.

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• BastingChemina@slrpnk.net ⁨1⁩ ⁨year⁩ ago

  I love my steel bike, it’s great on the road, on gravel or for a quick grocery shop.

  I’m not gonna win any competition with it but it is honestly such a fun bike.

  And with care it should last forever.

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• tissek@sopuli.xyz ⁨1⁩ ⁨year⁩ ago

  And now I’m back to looking at steel (and titanium) adventure hardtails…

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