[PSUBS-MAILIST] buoyancy

[Sean T. Stevenson via Personal_Submersibles]

I will add that having a sphere which is stronger against external
pressure than it is against internal is extremely counterintuitive,
except perhaps for a material like unreinforced concrete.

Sean


On 2015-11-11 12:26, Sean T. Stevenson via Personal_Submersibles wrote:
> 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
> 
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>