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Re: [PSUBS-MAILIST] Concrete submarine
A steel renforced concrete structure will have millions of small cracks which will not be detrimental to the overall structure. As long as the hull is sealed, or if it is thick enough it wouldn't matter, but if it was sealed with epoxy there would be no problem. The two materials are completly different and could not be compared in the same way. The concrete hull would need to be very much thicker to be able to function as compression structure. At a certain thickness the concrete tube would be able to transfer all the compression loads equally and would become stronger as more load was applied. Where as steel would buckle at some point.
Brian
----- Original Message -----
From: "George Slaterpryce" <gslaterp@hotmail.com>
To: <personal_submersibles@psubs.org>
Sent: Thursday, January 18, 2007 11:13
Subject: Re: [PSUBS-MAILIST] Concrete submarine
> calculate it the same way, tensile strength and compression strength.
>
> Traditional concrete is an interesting material to use, and probably very
> practical... however it has damn near zero plasticity, and is prone to
> damage through shock, and may begin to crack under load. Once a crack
> happens the whole hull is worthless as you can't weld or repair a preasure
> vessel made of concrete. Chips might be less severe damage wise but still
> more of a problem than a dent on a metal hull (again you can't repair
> concrete in any meaningful way)
>
> There is a plasticized concrete out there mentioned in a previous post that
> may alleviate some of the above problems... But...eh..
>
> Ever hear of the great cement canoe race? Every engineering school has one,
> look em up and you'll see all sorts of interesting thoughts on concrete as
> material for a hull that can be transposed (with a little thought) into
> submarine hull thinking.
>
> ----- Original Message -----
> From: "Øystein Skarholm" <skarholm@gmail.com>
> To: <personal_submersibles@psubs.org>
> Sent: Thursday, January 18, 2007 1:39 PM
> Subject: Re: [PSUBS-MAILIST] Concrete submarine
>
>
> >I have been looking around the net for some hours now, trying to to
> > find out more about C-subs. Does anybody know if there is a huge
> > difference in calculating the pressurehull capacity of a concrete hull
> > compared to a steel hull? As the guy claims on his web site: It cheap
> > and requires almost no maintenance.
> > One other thing. I have made a Mathcad sheet (si units) for
> > calculating stress in hull under external pressure. based on ABS rules
> > for building and classing underwater vehicles......
> > I have done the tubular part and will soon start on the spherical
> > part. Anybody interested in such a sheet?
> >
> >
> > On 1/18/07, Ian Roxborough <irox@ix.netcom.com> wrote:
> >>
> >> Yeah the website is new (to me anyway). I think this guy was
> >> posting to the psubs mailing list a couple of years back (and
> >> also shared some pictures then). But the website has better
> >> pictures. Hope we gave him a better welcome than he's getting on
> >> rec.boats.building, one reply accusing him of faking the
> >> pictures.... moron...
> >>
> >> Ian.
> >>
> >> On Thu, 18 Jan 2007 10:35:34 -0500
> >> Michael Holt <mholt@ohiohills.com> wrote:
> >>
> >> > I think we've seen this before, but I don't recall having access to a
> >> > website. A note was placed here:
> >> >
> >> > http://groups.google.com/group/rec.boats.building/browse_thread/thread/4d063f6278116dfb?hl=en
> >> >
> >> > It led to this website:
> >> >
> >> > http://www.tolimared.com/submarine
> >> >
> >> >
> >> > M
> >> >
> >> > --
> >> > It's amazing, really, how much people think you must know if you know
> >> > about something nobody else much cares about. -Tommy Whittaker
> >> >
> >> >
> >> >
> >> >
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> >
> > --
> > Vennlig hilsen
> > Øystein Skarholm
> >
> >
> >
> >
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>
>
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