RE: [PSUBS-MAILIST] Pressure hull materials

["Alec Smyth" <Asmyth@changepoint.com>]

I bought the book after Ian made that post, and it is excellent. However, I also discovered I'd  forgotten all my linear algebra... there was a time when I understood the stuff, but I'm afraid nowadays it is way over my head. Seriously, only invest the $55 if you're very well versed in tensors and such, or you might find it a tad frustrating.
 
Alec

	-----Original Message----- 
	From: Ian Roxborough [mailto:irox@ix.netcom.com] 
	Sent: Fri 12/20/2002 1:37 PM 
	To: personal_submersibles@psubs.org 
	Cc: 
	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.

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