Re: [PSUBS-MAILIST] Aqua Jet Cutting Acrylic

["Peter Madsen" <peter@submarines.dk>]

Ian,


I dont hope anyone here simply dives with a window - because they have 
calculated it can take the pressure. Unlike the complete hull - a vindow can 
easyly be tested.

We have made a very simple test stand for our diam 200 windows. E.g. Kraka 
has a number of 15 mm thick 200 mm diam windows. We typically dive Kraka to 
30 feet, and sometimes to 60 - 70 feet - or in our units some 20 meters. A 
test window like the ones we used went into the test stand that mimics the 
bolts and flanges of the real boat and was tested to destruction. At 280 
meters it developed a small crack - and this was accepted as failure. This 
type then goes into Kraka for dives to 20 meters.

For UC-3 we have designed a window that can undergo tests on the spot - that 
is in the frame that it will later be used in. Those window are also 200 mm, 
and the design may fit thickness up to 80 mm - however we are planning to 
use 40 mm acrylic. We are yet to test it - but my guess is that burst 
pressure here is in the order of 1000 meters. UC-3 is designed for 100 
meters.

We do not make any heat treatments - but I might change that.

Anyway - materials can fool you - and I don't not claim our procedures are 
safe - only that it seams unlikely to me that they are very dangerous. There 
are cases where airplane parts loaded to only a very small fraction of their 
short term strength have failed with catastrophic results. But - this is how 
we do it.

Peter 


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