[PSUBS-MAILIST] bolt in penetration

hank pronk via Personal_Submersibles personal_submersibles at psubs.org
Sat Jan 10 14:54:26 EST 2015


Sean,
Is there a on site test that can be done to determine the alloy?  
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, 2:46 PM
 
 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 t!
  ight 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 hol!
  e.
 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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