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Re: [PSUBS-MAILIST] Pressure hull materials
Ian,
I wonder if it is of any consequence/design that the "corrugations" are
shallow and are more like curves than "sharp" corrugation anles? I'm sure
that weighs into the formula as well, don't you think? Where might we find
this formula described? any clues?
To all,
Rather than getting a test "fixture" for testing pressures on structures,
has anyone tried just "dunking" a structure to a depth using a crane to
lower and raise the test structure? Are there any studies on various
geometric designs for subs besides cylinders? Such as octagons, triangular
shaped subs, even rectangular hulls? I am also curious about the thickness
of steel and other metals at various depths. I've read the Aquarius U/W hab
has a 3/4" steel outer hull at a depth of 63' but is it possible to build a
structure with a thinner specification? What about for no deeper than 33
foot (1 ATM)?
Jay.
----- 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.
>
>