Re: Information Wanted

[Martin Sanderse <sanderse@interlog.com>]

Rick Lucertini wrote:
> 
> Here's one for the group.  For those of you with the patience and
> engineering/scientific curiousity, build your pressure hull to scale in a plexiglass
> model.  Bathe the model in polarized light while in a homemade pressure chamber (with
> a window).
> 
> When viewed through another piece of plastic, stress concentrations will be seen as
> "folds" and lines appearing before your eyes.  As you release the pressure, the lines
> disappear.  Repeated "dive" cycles will eventually show up as permanent damage to the
> model.  Concentrate on hatch areas, thru-hulls, etc.

I understand that there is some kind of brittle "paint" you can put in
the critical areas.  After going through a pressure cycle it will crack,
showing you where the deformations occur.  Any ideas what it's called or
where you can get it?  Perhaps it would be just the thing for that first
unmanned dive.

-- 
Martin Sanderse
---------------
http://www.interlog.com/~sanderse/