Re: [PSUBS-MAILIST] Pressure Hulls

[Ian Roxborough <irox@ix.netcom.com>]

Hi,

This might be due to "limit pressure" vs "yield pressure"
vs "linear classical buckling pressure".  The formula mentioned
only calculates the maximum yield pressure.

Ian.

On Mon, 1 Jul 2002 14:34:03 -0400 
Alec Smyth <Asmyth@changepoint.com> wrote:

> Pat,
> 
> About a year ago, I looked up the formula for spheres (can't remember if it
> was the same one you just used though) and ran some numbers based on
> examples of sperical-hulled boats in Busby. The formula was simple enough,
> but the pressure ratings I got were way higher than the ratings given in the
> book, which left me a bit puzzled. Its hard to mis-calculate with such a
> simple formula. D'you know whether common practice might be to use an
> inordinately high safety factor with spheres, given they're so sensitive to
> out-of-roundness? I'd pull out my Busby and run some numbers with this
> formula to see how it jibes, but I'm at the office. So I really should get
> back to work! But I'll try doing this later.
> 
> rgds,
> 
> Alec
> 
> -----Original Message-----
> From: Captain Nemo [mailto:vulcania@hawaii.rr.com]
> Sent: Monday, July 01, 2002 2:05 PM
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] Pressure Hulls
> 
> 
> Dewey,
> 
> I wasn't worried about that; just clarifying that mine was an exercise with
> the formula, not an estimate of your particular hull's capabilities.
> 
> Pat
> 
> 
> 
> ----- Original Message -----
> From: "Dewey Mason" <drmason2001@yahoo.com>
> To: <personal_submersibles@psubs.org>
> Sent: Monday, July 01, 2002 7:25 AM
> Subject: Re: [PSUBS-MAILIST] Pressure Hulls
> 
> 
> > Hey All,
> >   I assure you I think highly of you all, HOWEVER,,,,
> > I will double check ALL math on my sub, I promise. Not
> > that I don't belive you, just that I don't breath
> > water, and feel no desire to be smooshed inside a
> > steel ball. Sounds unpleasant.So you need not worry
> > that I will kill myself and then blame you.
> 


-- 
The moon ate the sun on Monday and it was an awsome sight to see.