[PSUBS-MAILIST] concrete

[hank pronk]

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
 
       
 
       
 
       
 
     
   
 
 
 -----Inline Attachment Follows-----
 
 _______________________________________________
 Personal_Submersibles mailing list
 Personal_Submersibles at psubs.org
 http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles