[PSUBS-MAILIST] bow window

[Sean T. Stevrnson via Personal_Submersibles]

Temperature doesn't really factor in to the calculations. Technically, seawater density is a function of both temperature and salinity (and very slight compressibility), but the user just enters an average value for density. Similarly, the shell material properties can be tweaked from the average values that are programmed in as defaults, to accommodate specific known material test values or just for increased conservatism. The calculations are assumed to be valid for any material within transition temperature limits, but no specific attempt is made to model creep in acrylic or toughness transitions in shell materials at extremely low or high temperatures. This software is just an implementation of the formulas presented in the ABS Rules. Simply put, if seawater is still liquid at your operating temperature, you're probably okay. The lack of perfect determinism at failure is why we have safety factors.

Sean


On November 14, 2014 2:50:52 PM MST, Hugh Fulton via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>Sean,
>
>That is a very sexy programme you have there.  What temp do you have as
>standard for that calc?
>
>Regards,  Hugh
>
> 
>
> 
>
>From: Personal_Submersibles
>[mailto:personal_submersibles-bounces at psubs.org]
>On Behalf Of Sean T. Stevenson via Personal_Submersibles
>Sent: Friday, 14 November 2014 6:45 p.m.
>To: Personal Submersibles General Discussion
>Subject: Re: [PSUBS-MAILIST] bow window
>
> 
>
>On 2014-11-02 12:06, Vance Bradley via Personal_Submersibles wrote:
>
>Cliff, I'm thinking full hull diameter, 36" or thereabouts.
>
>Vance
>
>
>Vance - I was running some hull calcs for Brian Cox, so I ran a calc
>for
>your 36" dome port just to see... Looks like you could get away with
>one
>inch thick material for a 500' test depth.  
>Also - the calculator is designed for a full shell, so cut all the
>weight
>and buoyancy figures in half for a hemisphere.
>
>Sean
>
>
>
>
>
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