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Joined 1 year ago
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Cake day: July 15th, 2023

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  • It really is basic engineering.

    Like.

    Probably not even 101. We’re talking about material selection…. And the properties aren’t exactly unknown and the necessary capabilities aren’t unknown.

    The only think that was really unknown is how many dived it had. (CF can be fickle. It’s almost certain there were Minor defects. That’s just something you engineer around, sure, but you never know how close those defects are to becoming not-minor, and it really doesn’t take much. A single micro crack in the wrong place and… well, it probably happened fast enough that they didn’t even know.)




  • That’s the problem with the carbon fiber.

    Composites like that have a limited lifespan, and they’re very hard to model- there’s a lot of assumptions going into the modeling like “the fibers are all laid perfectly” and “the resin-to-fiber ratio is perfect” and similar. It’s also super hard to check for defects.

    Normally, a lot of this is worked around by increasing the amount of CFC to provide a margin if error.

    The problem is that you eat up that margin of error as defects expand under the cyclic stress of going down and coming back up.

    Worse, they were not inspecting the pressure hull in a way that could detect the nano- and -micro-cracks so they could tell when it was time to take it out of service.

    (That kind of inspection is ridiculously expensive. Like. Yeah.)

    Well.

    Normally this is avoided by using (very expensive) materials like titanium alloys that are “strong” enough to not fatigue after a few trips. (Strong isn’t quite the right word.

    Or extremely expensive (to make) acrylic (PMMA,). It’s expensive to make because of some extremely exacting tolerances.

    Incidentally, one of the reasons acrylic is used a lot is its transparency makes it super easy to see defects like cracks. (Literally you can see them with no special equipment.)

    In any case while CF isn’t exactly cheap, it was less expensive than a titanium hull, or the acrylic bubble hull you see on the Triton subs; but the whole inspection thing got nixed because of greed.

    Fun fact; the only reason this hearing is happening is because two of the passengers were rich. Normal people don’t get this dog and pony show.

    Other fun fact: they signed liability waivers. Which makes this a very fun dog and pony show.



  • Greed. not “explorer passion”.

    The risks weren’t unknown. People have been building submersibles capable of reaching that depth for quite some time, most of the people involved are very willing to share their lessons learned and give feedback. They were consulting with NASA and Boeing, both dropped it (I suspect because of a distinct unwillingness to heed their advice and warnings.).

    OceanGate willfully ignored the risks, and the warnings, cut corners and found out. unfortunately four others found out, too. Though I only really feel bad for the kid.