[TheForge] metallurgy question

[Jeff Wilson]

Aluminum will work and is commonly used, thicker may be your answer.  HY 80 
and HY 120 steel and Titanium are common Military sub. pressure hull 
materials. Even fairly mundane composite materials are use successfully in 
smaller pressure vassals. I suggest you contact someone with application 
specific experience rather than asking us to reinvent established 
technology.

Offered respectfully,
J Wilson  former USN
----- Original Message ----- 
From: "terry l. ridder" <terrylr at blauedonau.com>
To: "theforge e-mail list" <theforge at mailman.qth.net>
Sent: Friday, May 27, 2011 11:12 AM
Subject: [TheForge] metallurgy question


> hello;
>
> i have a metallurgy question.
>
> a camera housing on one of the deep submergence rov needs to be
> re-engineered. the housing is subjected to compression and expansion
> cycling on every trip it makes. the current housing made of aircraft
> aluminium alloy is showing definite stress fractures and microfissures.
> the lense assembly is fine. would like to use something other than
> indium for the lense seals but they hold up the best.
>
> the current camera housing is a cylinder open on one end for the fused
> quartz lens assembly.
>
> the current cameras are being replaced with HD cameras. having a camera
> crushed at depth really defeats the purpose of the rov and the HD
> cameras.
>
> the camera assemblies are not allowed to free-flood while every
> other feature of the deep submergence rov is allowed to free-flood.
>
> not only are the camera housings subjected to extreme pressure but
> temperature differentials. Lake Superior is roughly just above freezing
> at 1,000 ft. Lake Michigan is approximately the same at 900 ft.
>
> the pressure at 1,000 ft is 459 psia. (pounds per square inch absolute)
>
> would anyone have suggestions for an alloy that would take the
> mechanical stress and thermal cycling that the camera housing must
> experience?
>
> -- 
> terry l. ridder ><>
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