Plan Type 095/096 Nuclear Submarine Thread

Discussion in 'Navy' started by Hendrik_2000, Nov 27, 2017.

  1. Brumby
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    Brumby Major

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    Do you have a source for your equation? I am having a hard time understanding it and relating it to dive depths.
     
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  2. ougoah
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    ougoah Senior Member
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    I'm going to guess these look like buoyancy calculations based off arbitrarily uniform volumes for displaced water with rough sub sizes. Don't think this is how diving depth on subs work though.
     
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  3. Anlsvrthng
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    Anlsvrthng Senior Member
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    https://www.efunda.com/formulae/solid_mechanics/mat_mechanics/pressure_vessel.cfm

    Google keywords : pressure vessel equation.

    Pressure multiplied with radius , divided with max allowed material stress yield the wall thickness.

    I just realised that the equation require radius, not diameter : )

    Anyway, it means that if there is a vessel certified for a diving deep and a diameter , doubling any value will double the pressure vessel mass, and doubling both parameter quadruple the vessel mass.

    Of course the fact it has negative pressure means the vessel won't flex out itself to the correct radius, but any manufacturing imperfections can collapse the structure ,depending on the level of error .
     
  4. Hendrik_2000
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    Hendrik_2000 Brigadier

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    Some interesting details about the future Chinese SNA Type 09V are revealed today in a shopping list of the Chinese army. We see the chassis and studs to reduce the noise transmitted to the hull, a low solid "3D", dive bars at the bow, sonars compliant ...

    [​IMG]
     
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  5. azesus
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    azesus Junior Member
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    So that low sail H2600 was a small model 09V after all
     
  6. taxiya
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    taxiya Major
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    maybe not a model of 09V, but certainly to test the design principle of low sail and many more.
     
  7. Air Force Brat
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    Which are also difficult to weld, but very strong... the problem with Titanium is another matter altogether, Titanium cracks at the weld considerably more often than steel, but make no mistake, HY-100 is also very difficult to get a good clean weld on...

    Why don't you elaborate on some of the design factors of the Russian sub that allows it to dive considerably deeper, feel free to include any observations on safety. Could or does China incorporate those design elements into their subs??
     
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  8. Air Force Brat
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    I think you're right, but what was he trying to say??
     
  9. Brumby
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    Titanium is both expensive and very difficult to work with. Whilst it initially allowed the Russian subs to go deeper, every time titanium is compressed it becomes more brittle. In effect, every time a titanium-hulled sub goes deep, it reduces how deep it can go next time. Progressively the Russian submarines had more fatigue cracks and became noisier as the cracks would rub against each other. The story is, the Russians never solved the creep fatigue interaction problem associated with Titanium. The Russians simply traded off depth for longevity and noise.
     
  10. Air Force Brat
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    So what kind of steel do the Chinese use on their latest boats? and have they gone a completely different direction on own nuke boats as far as design?
     
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