Titanic tourist sub goes missing sparking search

Re:Titanic tourist sub goes missing sparking search by Avlin67 on Monday June 19, 2023 @08:46PM (#36398330)

let me be naive : carbon fiber composite is about tensile stength, not compression strength ? what happens in the ocean ? compression...

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Re:Titanic tourist sub goes missing sparking search by johnwalkr on Tuesday June 20, 2023 @03:18AM (#36400725)

Individual fibres, yes. But the composite material is fibres and resin. Plus the vessel is surely pressurized.

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Re:Titanic tourist sub goes missing sparking search by rsaxvc on Tuesday June 20, 2023 @08:34AM (#36403105)

Probably not pressurized much in the scale of things.

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Re:Titanic tourist sub goes missing sparking search by jacquesm on Tuesday June 20, 2023 @06:21PM (#36411526)

With a pressure differential of 399 atmospheres I don't think that the vessel being pressurized is going to be much of a factor. It might as well be vacuum.

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Re:Titanic tourist sub goes missing sparking search by durundal on Tuesday June 20, 2023 @04:27PM (#36410008)

The fibers are strong in both tension and compression (not equally so, see figure 1: http://home.iitk.ac.in/~mohite/axial_compressive.pdf), but in compression their aspect ratio is very very very large so they buckle instantly… unless you glue them together so each strand is supporting the ones near it and the effective aspect ratio is much less. Aside from fiber wound pressure bottles just about any real world composite structure will experience bending forces which will put the top in compression and the bottom in tension. The designer might need to reinforce the compressive side more, depending on the application (e.g. if designing for stiffness the strength might end up with considerable margin for both tension and compression).

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