[PSUBS-MAILIST] buoyancy

[Alan James via Personal_Submersibles]

Sean,I just put it through the Deep Sea Power & Light program whichhas basic geometries & a materials list with epoxy / fiberglass.I had spent a lot of time a couple of years ago, researching the building
of a fiberglass 1atm sub. The E glass / epoxy combination was the best(including price) for compressive strength.Those carbon fiber pressure vessels are wound so a different kettle of fish.Graham Hawke did a carbon fiber wound submarine pressure hull at one stage.They do have carbon fiber masts which are both under compression & tension,so the compressive strength can't be too bad.Alan 
      From: Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org>
 To: 'Personal Submersibles General Discussion' <personal_submersibles at psubs.org> 
 Sent: Thursday, November 12, 2015 8:44 AM
 Subject: Re: [PSUBS-MAILIST] buoyancy
   
Sean,
We have a New Zealand developed programme for design that is widely used in
the pacific islands where Kiwis (NZ'ers) are involved. It covers piping,
fabrication, ditch digging, construction of most things.  It is called
"TLAR".  No guarantees go with it.
Hugh 



-----Original Message-----
From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
On Behalf Of Sean T. Stevenson via Personal_Submersibles
Sent: Thursday, 12 November 2015 8:26 a.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] buoyancy

Alan, how did you do that calculation?  What layer count, thickness,
component volume fractions and principal fiber orientations did you use?

Sean


On 2015-11-11 12:15, Alan James via Personal_Submersibles wrote:
> Hank,
> I did a quick calc on a sphere of nominal dimensions made of epoxy / 
> fiberglass.
> With external pressure it had a depth of 4347ft, with internal 3785ft. 
> I should have posted the results in psi, but you get the picture.
> The big thing to me would be that if you ruptured it by hitting 
> anything, or so it failed, you would go down like a lead balloon.
> Alan

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