Re: [PSUBS-MAILIST] PSUB Fatalities...View Ports...Shatterproof

["Vikking" <vikking@mindspring.com>]

hello Paul, I am tryng to put together a accident simulation to resume all
the safety  ideas of the psubs members, on a guideline to help whith the
improvement or new designs, I was reading your post,
I think that , you should run the bullet test if you are thinking to visit
some rough geographical locations in your psub, it will be very nice to know
the  canopy will not crack under gunfire, but  i must add that they usually
carry ak47... and it really has a punch.

may be a more realistic test will be to hit the test area whith some
concrete  wheight or just a big rock, I believe that most of the time the
frame area is weaker than the laminate, the strees of the impact will spread
to the adjacent area, will be nice if we could make some form of post on the
differents combinations available.
please ,do explain the absorption of energy by the crooslink bonds, is this
similar to what happend on the molecular structure of diamond and graphite?

Gabriel
----- Original Message -----
From: Paul Suds <paul_suds@hotmail.com>
To: <personal_submersibles@psubs.org>
Sent: Thursday, March 09, 2000 9:04 PM
Subject: Re: [PSUBS-MAILIST] PSUB Fatalities...View Ports...Shatterproof


> Ok, obviously the engineering finite analysis calcs and the ball peen
hammer
> example didn't quite sink in yet. I'm not being arrogant here, but maybe a
> little cocky :0  How does this sound, I can take my canopy, properly
framed,
> and shoot an aerage .38 caliber or 9mm NATO round from 25 feet at it.
After
> one round no hole, after two rounds no hole, maybe after three rounds in
the
> same location, I may have some penetration. The glass laminates usually
> found in bullet proof glass  (Glass..polyurethane
> binder...polycarbonate...polyurethane binder...glass) , are somewhat
> stronger than pure polycarbonate, because they add thickness and absorb
some
> of the shock associated with the projectile. The glass is usually added
for
> scratch resistance, not impact resistance. If you want me to explain the
> absorption of energy by the crosslinking bonds, please ask. Creep
resistance
> for 1/2 to 3/4 inch carbonate at 60 ft pressure is not a factor, unless
the
> surface area is large and not properly framed. Again, I wouldn't want to
be
> the pilot, I would prefer to be pulling the trigger. Finally, do your own
> testing before and after installation. I assume no liability for anything
> said here. You should test your own view port, but don't use a gun.. ;=)
> Junior commander grade Suds (ex-tadpole)
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