Re: [PSUBS-MAILIST] Pressure hull materials

["Jaytron" <jaytron@wideopenwest.com>]

Thank you, Ian,
for the tin can info, that is. That is very insightful.

J.

----- Original Message ----- 
From: "Ian Roxborough" <irox@ix.netcom.com>
To: <personal_submersibles@psubs.org>
Sent: Friday, December 20, 2002 1:37 PM
Subject: Re: [PSUBS-MAILIST] Pressure hull materials


> On Fri, 20 Dec 2002 12:07:18 -0500
> Michael B Holt <tlohm@juno.com> wrote:
> 
> > On Fri, 20 Dec 2002 08:27:31 -0800 (PST) Ray Keefer writes:
> > >
> > >Certainly the corrugations would act as ribs to keep the sides from
> > >caving in. Wouldn't the corrugations pre-dispose the hull to 
> > >collasp acordian style?
> 
> Well, that sounds like a nice thesis topic for somebodies masters degree.
> He talks about the different failure modes of tin cans, but doesn't
> really mention acordian style failures.  Although, if you had end
> cap surfaces that where greater than the cylinder's surface, I could
> imagine the longitudinal force could fold the corrugations in a failure
> as you describe.
> 
> A little side note on tin cans you get beans and other food in:
> The reason they have ribs or corrugations is due to the fact that
> to tin some food you need to suck all the air out of the tin first.
> The corrugations give the tin extra strenth without making it
> heavier or using any framing rings (since while there is a vacuum
> inside it is under external pressure).
> 
> > Good idea.  I'd not thought of that.   It might be sufficient, then,
> > to add internal stiffening rods going the length of the thing.
> > 
> > The book Ian referenced might help here.  Ian, can you give
> > more information on it?   Is it in print?
> 
> I posted a mini review of the book in question to the list a
> while ago, you can read it here:
>   http://www.psubs.org/mlist/archive/0112/msg00271.html
> 
> It's probably not everybodies cup of tea, after about page 20
> it gets pretty advanced and bleeding edged.  I couldn't really
> imagine any psubs trying out any of the latest ideas talked about
> in the book (not until they are more proven anyway).  But saying
> that, I really enjoy reading about what could be future submarine
> pressure hull design and construction techniques.
> 
> It's still in print and still costs $55.
> 
> Ian.
> 
>