Comments by "Shades_of_Midknight Shades / Knight" (@shades_of_midknight) on "OceanGate Titan Hull - Hundreds of Ill-advised Carbon Fiber Grind Spots" video.

@claysweetser4106 that is precisely the strength of a carbon fiber The Continuous distribution of load across the length of *The Continuous* fiber... the moment you break the fiber in any manner be it scoring, sanding or pressure buckling... it can no longer sustain any load and thus the load transfers to the surrounding fibers. And that's why the idea of the hull continuously making snapping sounds every time they used it, and literally doing no more monitoring of the hull than once again just listening to the thing degrading... made it this outcome beyond Thanos level inevitable...
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Who else began screaming No No No when they said that they Ground Down The Carbon Fiber to get rid of wrinkles...?
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@nickthegardener.1120 This borderline feels like when Russians say their word for Innovation when they glue four AK-47s together as an anti drone weapon that fails to save one person... especially the operator...
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07:26 😱 I thought that was a covering!!! They had THAT LEVEL of irregularities!?!?!
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If you want to know why Stockton Rush dismissed the idea of the 45° Plies based purely off of there being no torsion in the sea... all you need to do is look up his actual education... he's an aerospace engineer... he is thinking torsion on carbon fiber wings that you experience in flight due to turbulence... he has no comprehension of cyclic fatigue or the fact that each of these fibers is going to be continuously under crushing pressure whenever they are at depth and thus they will have fibers that fail... which he even admits to but fails to understand that when you only have 0-90 wraps... each failed strand will cause the fibers beside it and under it to suffer the additional load... by not having that 45° ply, it is literally like smashing down through stacked balsa wood blocks with their easy to break grain lined up...
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7:00 Each time they ground through both a radial and axial layer they effectively created a failure point. It is honestly no different than the carbon fiber snapping during use except this is before it's even used... Each broken fiber is one step closer to the entire whole failing because carbon fiber is only strong as a unified continuous material... grinding into it like this is no different than making a ball of string that you've cut a thousand times and then expect it to hold together...
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As an individual that used to do macroscopic weld analysis for a quality control lab utilizing computer programs to measure down to micrometer level and Below sizes... I can tell you right now that representative sample that they had from the cutoff end probably was if anything... better than what the center of the hull would look like... So if anything your calculations are far Kinder than I could ever condone in any of my testing, and it is STILL A HORROR SHOW!
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05:05 Given what I saw from The Limited shots of the first Hull... I wouldn't trust Spencer Composites to tell me it was bright outside when the sun was out... seriously they managed to make a carbon fiber and resin Matrix that looked more like a piece of an Aero chocolate bar... and that is seriously just chocolate foam!
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The fact that they didn't have glue press out or any means by which to actually ensure that all air pockets and so forth were properly pulled from that interface showed me that these guys were not real Engineers or serious about what the f@ck they were doing... I've seen car speakers installed with better care and attention to detail.
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Non homogeneous materials like any composite are basically famous for being incredibly hard to model in computers... we would genuinely need to achieve a fleet of fully functioning Quantum supercomputers to properly calculate out the likelihood of failure when you introduce thousands upon thousands of fiber discontinuities like this into anything let alone a pressure vessel for human occupancy... the fact that he sold everybody on the idea of his real-time acoustic monitoring system is fundamentally gross negligence if not False Advertisement and thus voids his convenient little liability waiver...
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15:05 The other thing is given the fact that they even state in the hearings that issues tend to compound with each wrap, one of those red circles you indicate likely also meant that a new lump would develop in that same area and would also likely need to be ground down... at this point they've made their hull out of perforated paper...
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Ultrasonic examination of materials is inherently limited by the amount of Sonic energy you can push thru the material without damaging it. The amount of energy you would wind up needing to pump through 5 inches of carbon fiber and resin would result in too many harmonics issues (loss of image resolution) if not potentially compromising the structural Integrity of the thing you're working on examining considering certain frequencies of ultrasound are used to break up kidney stones...
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@solareclipsetimer I'm willing to bet they never investigated why they were getting the wrinkles in the first place so they had no methodology for preventing them when they made a new layer... I'm willing to bet this was the dog chasing its tail as far as creating surface imperfections
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05:25 My question is did they say that it had to be done that way in order to achieve that thickness or to ensure the proper performance of the carbon fiber and if they had any data at all about the effect this would have on the hull... my guess is no on the data and that they were simply told to make it 5 inches thick and so they made it that thick with no care beyond that.
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From everything that I understand about working with resins and various fibers, I can never understand why they thought simply winding up a lot of carbon fiber like it was string on a spool and then adding 90° Loops the same d@mn way would actually result in anything approaching a strong enough material to withstand Oceanic depth... Seriously this is made the same way that you spool up thread for sowing machines...
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10:27 Do translate the face that that poor engineer just made to English... no I'm going to have to use bad English for this to make sure that the point is properly conveyed... "No the Fuck it isn't a normal sort of goddamn thing you do with carbon fiber... nicking or scratching thru carbon fiber in the center of a product can make it worthless as far as structurally speaking... so no... intentionally grinding 10% of the way through one of the layers of your Hull and then just acting like nothing happened is not standard practice..."
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@shroomzzz I also remember watching somebody that was doing a bit on the interfacing glue. They actually used an aviation grade glue that had a aluminum filler within it and if you know anything about galvanic corrosion which occurs in the ocean, having aluminum in close proximity to Noble metal like titanium and the fact that carbon fiber is also electrical conductive... them utilizing the glue that they did pretty much guaranteed it was going to degrade over time.
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They actually already had a method of stripping the exterior surface to have a good mechanical bond, they called it a peal ply, more or less a kind of rind that they would strip off and then apply a layer of glue and then apply a winding. The wrinkles would actually come about after doing the process of autoclaving by having the atmosphere inside the oven pumped out as it was heated, all of the air pockets or discontinuities in the amount and location of resin would sort themselves out in totally uncontrolled patterns influenced by any number of tiny and I do mean tiny surface defects, from hair having fallen onto it, to any time the pre-preg carbon fiber had a bit more resin clinging to the fibers... Add in the factor that they utilized a sheet of glue that would be wrapped around the entire surface by hand before applying a new winding... You can get an idea of how many Errors were easily introduced on every single layer. They hardly even bother to prototype, let alone test for a better method of ensuring a quality manufactured product. The entire operation was more slapdash than some at-home, Budweiser and Bondo repair jobs I'm sure you have seen my friend.
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@fishanhunter it genuinely is rather haunting isn't it? How many people were inches away from death...
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@solareclipsetimer indeed, such was my point, I could tell you were being as generous as possible and even then you were coming to the same conclusion that I did... that this was swiss cheese, not a pressure vessel.
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@solareclipsetimer My God, did they do anything in accordance with recommendations of experts?
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Okay, I have a serious question here... why would those lumps in the surface on the final wrap not also prove to be stress point concentrations? Like imagine some of those lumps were the results of the previous layer being incompletely or in perfectly ground meaning that that area already has a matrix discontinuity so adding additional pressure by having there be an external lump would all but guarantee a failure in that area....
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@solareclipsetimer Given the porosity that was found, the failure of the glue joints between the various layers, the discontinuities that would happen by mixing both pre-preg and wet wound carbon fibers, and the fact that Ocean Gate seemingly did not have a methodology for calculating even an idea of cyclic fatigue life expectancy for a hull... the total lack of care shown throughout every single step of this... it is no surprise that people died.
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