Re: [PSUBS-MAILIST] Sphere

["Rick and Marcia" <empiricus@telus.net>]

Sphere failure - I'm not a one-atm kind of guy - I don't swing that way  ;-)

HOWEVER, since reinventing the wheel was never my strong suit, I'd consider
enquiring into what the pros have already done.

Determine your operating depth, and, using Busby (et al.) to find a sub with
a similar depth capability, use whatever hull material and thickness they've
used to build YOUR pressure hull with.

Mind you, that takes all the fun out of it I suppose.  I'm as goal oriented
as I am process oriented, so . . . to get a boat into the water is my
priority, to boldly go where . . .

Rick L



----- Original Message -----
From: "Karl Stanley" <karl@stanleysubmarines.com>
To: <personal_submersibles@psubs.org>
Sent: Wednesday, March 29, 2006 12:03 PM
Subject: RE: [PSUBS-MAILIST] Sphere


>
>
> I'd like to know a good source for spheres also. And
> other than FEMA on a cad system (Solidworks etc.) I am
> unsure how to acurately predict failure.
>
> On a sphere, because of it's simple shape, I would
> think that the falure calculation should be somewhat
> simple. That is, without bulkheads probably.
>
> -David
>
> Deep sea power and light offers a program called under pressure- I
> believe it's about $200- it is VERY easy to use and caculates the crush
> depths for any pressure vessel of any material as long as it is
> cylindrical or spherical.  The only downside is it is designed for
> makers of small pressure vessels- ie- things that are being machined
> absolutely perfect- so- when you're talking about spheres big enough to
> get into- unless you are funded with tax dollars you are not going to be
> able to afford to machine something that large  - especially spherical-
>    Other than that- I suggest looking thru the Busby book carefully-
> there are at least a dozen specs given on spherical hulls- thickness,
> material and diameter- and you can extrapolate from that- it's perfectly
> scalable- that's why models work- almost all subs are either 516- grade
> 70 or Hy-100- so- your'e material variable is fairly fixed- for
> reference 516-70 is roughly half as strong as the Hy-100-  hope that
> helps- Karl
>
>
>
>
>
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