[PSUBS-MAILIST] concrete

[Sean T. Stevenson]

Build a geodesic dome out of rebar, cover it in mesh, and pour a sphere of ultra high strength (no aggregate) fiber reinforced concrete around it, vibrating the hell out of it to eliminate bubbles. The shape might be a bit strange, given that your openings need be reinforced with a pad sufficent to replace the material missing in the opening, and your concrete shell is quite thick. You'd have to build a bunch of them, strain gauge them all, and lower them over the side until failure.

Sean


On April 12, 2014 6:40:53 AM MDT, hank pronk <hanker_20032000 at yahoo.ca> wrote:
>Hi Sean,
>Thank you for the calculation. That figure is quite interesting,
>considering it is only 30mpa.  I wonder if re-enforcement is beneficial
>given the sphere shape.  
>Imagine if you could figure out a safe way to make an opening in the
>sphere for ports and hatch, you could build a hull for under 1,000
>dollars.  Amazing!
>Hank
>--------------------------------------------
>On Fri, 4/11/14, Sean T. Stevenson <cast55 at telus.net> wrote:
>
> Subject: Re: [PSUBS-MAILIST] concrete
>To: "Personal Submersibles General Discussion"
><personal_submersibles at psubs.org>
> Received: Friday, April 11, 2014, 10:34 PM
> 
> 
>   
> 
>     
>   
>   
>     Hank,
> 
>       
> 
>       There are countless varieties of concrete, all with
> different
>       mechanical properties, so it is difficult to make an
> effective
>       comparison, but just for fun, I ran your scenario
> (6' OD, 4in
>       thick shell) with average material properties for
> ordinary
>       concrete, and it turns out it's good to over 1000
> fsw!  See below.
> 
>       
> 
>       Sean
> 
>       
> 
>       
> 
>       
> 
>     
>   
> 
> 
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-- 
Sent from Kaiten Mail. Please excuse my brevity.
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