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A comment on Debris field found in search for missing submersible. Parent comment

Re:Debris field found in search for missing submersible by xattt on Thursday June 22, 2023 @12:55PM (#36435163)
> That's not true, they've successfully reached the Titanic several times over a dozen or so expeditions.

This is more concerning, given that metal fatigue is an understood phenomenon (1).

(1) https://www.faa.gov/lessons_learned/transport_airplane/accid...

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Re:Debris field found in search for missing submersible by histriosum on Thursday June 22, 2023 @01:08PM (#36435398)
It's a carbon fiber hull, for which I think we know alot less about repeated stress events...
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Re:Debris field found in search for missing submersible by KineticLensman on Thursday June 22, 2023 @03:46PM (#36437728)
> It's a carbon fiber hull

...With titanium hemispheres at each end, so some sort of poorly understood titanium carbon-fibre interface.

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Re:Debris field found in search for missing submersible by hef19898 on Thursday June 22, 2023 @04:24PM (#36438363)
I know first hand how hard it is to design carbon fibre preasure bulk heads, for aircraft with a much lower preasure delta (I wrote my first thesis about how to produce something like that). So, on the sirface, titanium makes sense. Using both, carbon fiber and titatium is just, well, not a good idea. Especially since I have the feeling this whole things wasn't properly calculated in the first place.
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