[PSUBS-MAILIST] bolt in penetration

Sat Jan 10 14:46:24 EST 2015

Parallel projects... Sister subs... Could be fun.

Sean

On January 10, 2015 12:19:38 PM MST, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>Yes but there two of them.
>Hank--------------------------------------------
>On Sat, 1/10/15, Sean T. Stevenson via Personal_Submersibles
><personal_submersibles at psubs.org> wrote:
>
> Subject: Re: [PSUBS-MAILIST] bolt in penetration
>To: "Personal Submersibles General Discussion"
><personal_submersibles at psubs.org>
> Received: Saturday, January 10, 2015, 2:16 PM
> 
> If it is suitable, I presume you're calling
> dibs?
> Sean
> 
> 
> 
> 
> On January 10, 2015
> 12:10:14 PM MST, hank pronk via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
> 
> Sean,
> I may be able to on Monday.  The sphere was
> owned by a university and we can contact them to find the
> manufacturer.  Given that is was used as a pressure vessel
> paid for by a university working on a government project, I
> have to assume it is good stuff.  Not very scientific but a
> fair assumption at this stage.  Luckily it is right in
> Brian's back yard in California so he was able to look
> at it and might be able to do some detective work.
> 
> Hank
> On Sat, 1/10/15, Sean T. Stevenson via
> Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
> 
>  Subject: Re: [PSUBS-MAILIST]
> bolt in penetration
>  To: "Personal
> Submersibles General Discussion"
> <personal_submersibles at psubs.org>
> 
> Received: Saturday, January 10, 2015, 2:02 PM
>  
>  Hank, any chance you can
> find out what the alloy
>  is? This will have
> a profound effect on its efficacy.
>  Sean
>  
>  
>  
>  
>  On!
>   January
> 10, 2015
>  11:51:22 AM MST, hank pronk via
> Personal_Submersibles
> 
> <personal_submersibles at psubs.org> wrote:
>  
>  Sean, 
> 
> Thank you, that is helpful.  My idea was to
> 
> make the insert as tight as possible (sweat it in)  I am
> not
>  sure if the difference in material
> would cause a problem
>  though. The idea of
> seating the port into the shell a good
> 
> option also.  I am just chewing the fat here, I have
> enough
>  on my plate but it is fun to think
> about.  I was wrong about
>  the size, the
> sphere is 6 feet and I wrote 60 in.  I imagine
>  that kills the rating quite a bit?
>  Hank
>  On Sat, 1/10/15,
>  Sean T. Stevenson via Personal_Submersibles
>  <personal_submersibles at psubs.org>
> wrote:
>  
>   Subject: Re:
> [PSUBS-MAILIST]
>  bolt in penetration
>   To: "Personal
> 
> Submersibles General Discussion"
> 
> <personal_submersibles at psubs.org>
>  
>  Received: Saturday, January 10, 2015!
>  , 1:40
> PM
>   
>   You could certainly
> do that,
>  although a three inch
>   thick shell is pretty
> 
> substantial - I might consider
>  
> machining
>  eg. conical window seats in the
> hull sh!
>   ell
>   directly,
> and then derating the hull
>  to a depth
> whereby the
>   actual hull
> 
> thickness is the effective derated thickness
>   plus the effective reinforcement, which
> just
>  happens to be a
>  
> contiguous shell.  The
>  bolt-in arrangement
> would not act as
>   hull
> 
> reinforcement though - unless it was a force fit in the
>   hole. The idea of reinforcements around
>  openings is to
>   provide
> material around the
>  hole to carry the shell
> hoop
>   stresses that
>  would
> otherwise have passed through the
>  
>  material in the opening, such that you
> don't increase
>   the nominal shell
> stress. This requires a
>  (relatively)
>   smooth load path to redirect
> 
> stress around the hole. Br!
>  ian
>   recently
>  asked me
> about the effectiveness of reinforcements
>  
> like perpendicular flanges lining the hole,
> 
> and this is a
>   bit complicated, because
> some
>  stress i!
>    s
> indeed
>  
>  redirected into
> such a flange, but the load is not evenly
>  
> distributed as you move inboar!
>   d or
>  outboard away from the
>   hull
> shell (with
>  diminishing returns at
> increasing
>  
>  distances),
> and you also introduce a stress concentration
>  at
>   the perpendicular
> transition. Ideally,
>  reinforcements
> should
>   be an effective
> 
> thickening of the hull in the region
>  
>  immediately adjacent to the opening, tapered
> smoothly
>  back
>   (something
> like 4:1) into the hull
>  shell to provide
> a
>   continuous load path
> 
> with no stress concentrations at abrupt
>  
>  changes in geometry.
>   Sean
>  
>  
>   
>   
>   
>   On
> January 10, 2015 8:25:39
> !
>   
> 
> AM MST, hank pronk via Personal_Submersibles
>   <personal_submersibles at psubs.org>
>  wrote:
>   Is it feasible to
> have a
>   bolt in penetration in a 3 inch
> thick sphere
>  hull.  I am
>  
> picturing machining a hole in
>  the hull,
> then inserting a
>   window housing
>  with a shoulder(flange) that fits tight in
>  
>  the hole and is bolted in
> place.  Can that arrangement
>  act
>   as reinforcement for the hul!
>   l.
>  
>  Hank
>   
>  
> 
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