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phyman

Posted: Thu May 01, 2008 8:15 am

Guest

Hi,
if anyone could help.

I need to know the wall thickness for a quartz glass tube and the fused
silica tube
The internal diameter is 65mm by 327mm long.
Safety factor figures for 1.2, 1.5 and 2.0
Water depth for 3000m and 4000m
I will have aluminium end caps fitted in both ends

spec sheets can be found here:
http://tinyurl.com/4lw7wg

Regards.

Uncle Al

Posted: Thu May 01, 2008 2:11 pm

Guest

phyman wrote:

Quote:

Hi,
if anyone could help.

I need to know the wall thickness for a quartz glass tube and the fused
silica tube

Quartz glass and fused silica are the same stuff. Fused silica is
purer (no major aluminum content). The strength of silica depends on
its internal hydration and the presence of surface flaws. Wet is
bad. A microscopic crack nucleates catastrophic material failure in
tension. NEVER put glass in tension unless it is surface flawless and
preferably tempered (toughened).

Quote:

The internal diameter is 65mm by 327mm long.
Safety factor figures for 1.2, 1.5 and 2.0
Water depth for 3000m and 4000m
I will have aluminium end caps fitted in both ends

spec sheets can be found here:
http://tinyurl.com/4lw7wg

Aluminum is weak metal, including 6061-T6. Chrome-moly for strength
and corrosion resistance.

If you are in compression you worry about mounting edge flaws. 3000
meters is about 4500 psi.

If you are worried, go for edge defined growth single crystal alumina
(white sapphire) - much stronger than fused silica, but birefringent
except along the c-axis (the slow-growing one, alas).

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2

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