[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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